NRP 10-Q Quarterly Report June 30, 2018

NATURAL RESOURCE PARTNERS LP

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10-Q 1 a2018form10-q2ndquarter.htm 10-Q Document

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

______________________________________________________

FORM 10-Q



ý	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2018



¨	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission file number: 001-31465

______________________________________________________

NATURAL RESOURCE PARTNERS L.P.

(Exact name of registrant as specified in its charter)

______________________________________________________



Delaware		35-2164875
(State or other jurisdiction of incorporation or organization)		(I.R.S. Employer Identification No.)

1201 Louisiana Street, Suite 3400

Houston, Texas 77002

(Address of principal executive offices)

(Zip Code)

(713) 751-7507

(Registrant’s telephone number, including area code)

______________________________________________________

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ý No ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes ý No ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See definition of "accelerated filer", "large accelerated filer", "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.



Large Accelerated Filer	¨	Accelerated Filer	ý
Non-accelerated Filer	¨ (Do not check if a smaller reporting company)	Smaller Reporting Company	¨
		Emerging Growth Company	¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ¨ No ý

At August 6, 2018 there were 12,245,920 Common Units outstanding.

NATURAL RESOURCE PARTNERS, L.P.

TABLE OF CONTENTS



		Page
Part I. Financial Information
Item 1.	Consolidated Financial Statements
	Consolidated Balance Sheets	1
	Consolidated Statements of Comprehensive Income	2
	Consolidated Statements of Partners’ Capital	3
	Consolidated Statements of Cash Flows	4
	Notes to Consolidated Financial Statements	6
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	29
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	48
Item 4.	Controls and Procedures	49
Part II. Other Information
Item 1.	Legal Proceedings	50
Item 1A.	Risk Factors	50
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	50
Item 3.	Defaults Upon Senior Securities	50
Item 4.	Mine Safety Disclosure	50
Item 5.	Other Information	50
Item 6.	Exhibits	51
	Signatures	52

PART I. FINANCIAL INFORMATION

ITEM 1. CONSOLIDATED FINANCIAL STATEMENTS

NATURAL RESOURCE PARTNERS L.P.

CONSOLIDATED BALANCE SHEETS



	June 30,			December 31,
(In thousands, except unit data)	2018			2017
ASSETS	(Unaudited)
Current assets
Cash and cash equivalents	$	52,975		$	29,827
Accounts receivable, net	59,312			47,026
Accounts receivable—affiliates	140			161
Inventory	8,048			7,553
Prepaid expenses and other	4,391			5,838
Current assets of discontinued operations	988			991
Total current assets	125,854			91,396
Land	24,809			25,247
Plant and equipment, net	47,917			46,170
Mineral rights, net	873,716			883,885
Intangible assets, net	47,924			49,554
Equity in unconsolidated investment	245,524			245,433
Long-term contracts receivable	39,878			40,776
Other assets	6,184			6,547
Other assets—affiliate	—			156
Total assets	$	1,411,806		$	1,389,164
LIABILITIES AND CAPITAL
Current liabilities
Accounts payable	$	7,801		$	6,957
Accounts payable—affiliates	1,453			562
Accrued liabilities	12,848			16,890
Accrued liabilities—affiliates	—			515
Accrued interest	14,609			15,484
Current portion of deferred revenue	2,732			—
Current portion of long-term debt, net	75,188			79,740
Current liabilities of discontinued operations	—			401
Total current liabilities	114,631			120,549
Deferred revenue	17,136			100,605
Long-term debt, net	723,147			729,608
Other non-current liabilities	2,385			2,808
Other non-current liabilities—affiliate	—			346
Total liabilities	857,299			953,916
Commitments and contingencies (see Note 15)
Class A Convertible Preferred Units (250,000 and 258,844 units issued and outstanding at June 30, 2018 and December 31, 2017, respectively, at $1,000 par value per unit; liquidation preference of $1,500 per unit)	164,587			173,431
Partners’ capital
Common unitholders’ interest (12,245,920 and 12,232,006 units issued and outstanding at June 30, 2018 and December 31, 2017, respectively)	326,125			199,851
General partner’s interest	4,427			1,857
Warrant holders’ interest	66,816			66,816
Accumulated other comprehensive loss	(4,872		)	(3,313		)
Total partners’ capital	392,496			265,211
Non-controlling interest	(2,576		)	(3,394		)
Total capital	389,920			261,817
Total liabilities and capital	$	1,411,806		$	1,389,164

The accompanying notes are an integral part of these consolidated financial statements.

NATURAL RESOURCE PARTNERS L.P.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)



	Three Months Ended June 30,						Six Months Ended June 30,
(In thousands, except per unit data)	2018			2017			2018			2017
Revenues and other income
Coal royalty and other	$	48,711		$	32,768		$	94,684		$	67,762
Coal royalty and other—affiliates	188			11,338			425			22,843
Transportation and processing services	5,002			4,146			10,385			4,146
Transportation and processing services—affiliate	—			1,374			—			6,013
Construction aggregates	34,233			27,363			60,657			52,846
Road construction and asphalt paving services	6,176			6,192			6,904			7,930
Equity in earnings of Ciner Wyoming	16,529			8,389			26,150			18,683
Gain on asset sales, net	210			3,361			870			3,405
Total revenues and other income	$	111,049		$	94,931		$	200,075		$	183,628
Operating expenses
Operating and maintenance expenses	$	38,301		$	31,020		$	68,269		$	60,648
Operating and maintenance expenses—affiliates	4,065			2,219			6,530			4,774
Depreciation, depletion and amortization	8,563			8,165			16,520			17,889
Amortization expense—affiliate	—			240			—			1,008
General and administrative	2,414			2,031			5,819			8,109
General and administrative—affiliates	849			852			1,780			1,976
Asset impairments	—			—			242			1,778
Total operating expenses	$	54,192		$	44,527		$	99,160		$	96,182

Income from operations	$	56,857		$	50,404		$	100,915		$	87,446
Other income (expense)
Interest expense, net	$	(17,734	)	$	(20,308	)	$	(35,704	)	$	(43,432	)
Debt modification expense	—			(132		)	—			(7,939		)
Loss on extinguishment of debt	—			(4,107		)	—			(4,107		)
Other expense, net	$	(17,734	)	$	(24,547	)	$	(35,704	)	$	(55,478	)

Net income from continuing operations	$	39,123		$	25,857		$	65,211		$	31,968
Income (loss) from discontinued operations	(34		)	133			(48		)	(74		)
Net income	$	39,089		$	25,990		$	65,163		$	31,894
Less: net income attributable to non-controlling interest	(869		)	—			(869		)	—
Net income attributable to NRP	$	38,220		$	25,990		$	64,294		$	31,894
Less: income attributable to preferred unitholders	(7,500		)	(7,538		)	(15,000		)	(10,038		)
Net income attributable to common unitholders and general partner	$	30,720		$	18,452		$	49,294		$	21,856

Net income attributable to common unitholders	$	30,105		$	18,015		$	48,308		$	21,419
Net income attributable to the general partner	$	615		$	437		$	986		$	437

Income from continuing operations per common unit (see Note 5)
Basic	$	2.46		$	1.46		$	3.95		$	1.76
Diluted	$	1.75		$	1.13		2.96			1.64
Net income per common unit (see Note 5)
Basic	$	2.46		$	1.47		$	3.95		$	1.75
Diluted	$	1.75		$	1.13		2.95			1.64

Net income	$	39,089		$	25,990		$	65,163		$	31,894
Add: comprehensive loss from unconsolidated investment and other	(434		)	(13		)	(1,559		)	(1,145		)
Comprehensive income	$	38,655		$	25,977		$	63,604		$	30,749
Less: comprehensive income attributable to non-controlling interest	(869		)	—			(869		)	—
Comprehensive income attributable to NRP	$	37,786		$	25,977		$	62,735		$	30,749

The accompanying notes are an integral part of these consolidated financial statements.

NATURAL RESOURCE PARTNERS L.P.

CONSOLIDATED STATEMENTS OF PARTNERS’ CAPITAL

(Unaudited)



	Common Unitholders				General Partner			Warrant Holders		Accumulated Other Comprehensive Loss			Partners' Capital Excluding Non-Controlling Interest			Non-Controlling Interest			Total Capital
	Common Unitholders
(In thousands)	Units	Amounts
Balance at December 31, 2017	12,232	$	199,851		$	1,857		$	66,816	$	(3,313	)	$	265,211		$	(3,394	)	$	261,817
Cumulative effect of adoption of accounting standard (See Note 2)	—	88,448			1,805			—		—			90,253			—			90,253
Net income ⁽¹⁾	—	63,008			1,286			—		—			64,294			869			65,163
Distributions to common unitholders and general partner	—	(11,015		)	(225		)	—		—			(11,240		)	—			(11,240		)
Distributions to preferred unitholders	—	(14,960		)	(305		)	—		—			(15,265		)	—			(15,265		)
Issuance of unit-based awards	14	410			—			—		—			410			—			410
Unit-based awards amortization and vesting	—	333			—			—		—			333			—			333
Comprehensive loss from unconsolidated investment and other	—	50			9			—		(1,559		)	(1,500		)	(51		)	(1,551		)
Balance at June 30, 2018	12,246	$	326,125		$	4,427		$	66,816	$	(4,872	)	$	392,496		$	(2,576	)	$	389,920


(1)	Net income includes $15.0 million attributable to Preferred Unitholders that accumulated during the period, of which $14.7 million is allocated to the common unitholders and $0.3 million is allocated to the general partner.

The accompanying notes are an integral part of these consolidated financial statements.

NATURAL RESOURCE PARTNERS L.P.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)



	Six Months Ended June 30,
(In thousands)	2018			2017
Cash flows from operating activities
Net income	$	65,163		$	31,894
Adjustments to reconcile net income to net cash provided by operating activities of continuing operations:
Depreciation, depletion and amortization	16,520			17,889
Amortization expense—affiliate	—			1,008
Distributions from unconsolidated investment	22,403			22,112
Equity earnings from unconsolidated investment	(26,150		)	(18,683		)
Gain on asset sales, net	(870		)	(3,405		)
Debt modification expense	—			7,939
Loss on extinguishment of debt	—			4,107
Loss from discontinued operations	48			74
Asset impairments	242			1,778
Unit-based compensation expense	1,073			3
Amortization of debt issuance costs and other	1,973			3,344
Other—affiliates	(190		)	(1,173		)
Change in operating assets and liabilities:
Accounts receivable	(8,926		)	(4,530		)
Accounts receivable—affiliates	21			236
Accounts payable	175			46
Accounts payable—affiliates	890			2
Accrued liabilities	(3,381		)	(7,302		)
Accrued liabilities—affiliates	(515		)	—
Accrued interest	(875		)	3,405
Deferred revenue	6,037			4,489
Deferred revenue—affiliates	—			(10,166		)
Other items, net	952			2,527
Net cash provided by operating activities of continuing operations	$	74,590		$	55,594
Net cash used in operating activities of discontinued operations	(447		)	(531		)
Net cash provided by operating activities	$	74,143		$	55,063

Cash flows from investing activities
Distributions from unconsolidated investment in excess of cumulative earnings	$	2,097		$	2,388
Proceeds from sale of assets	911			1,268
Return of long-term contract receivable	1,016			1,207
Return of long-term contract receivable—affiliate	—			804
Acquisition of plant and equipment and other	(5,857		)	(4,998		)
Net cash provided by (used in) investing activities of continuing operations	$	(1,833	)	$	669
Net cash provided by investing activities of discontinued operations	—			202
Net cash provided by (used in) investing activities	$	(1,833	)	$	871

NATURAL RESOURCE PARTNERS L.P.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)



	Six Months Ended June 30,
(In thousands)	2018			2017
Cash flows from financing activities
Proceeds from issuance of preferred units and warrants, net	$	—		$	242,100
Proceeds from issuance of 2022 Senior Notes, net	—			103,688
Borrowings on credit facility	35,000			—
Repayments of loans	(48,072		)	(348,292		)
Redemption of preferred units paid-in-kind	(8,844		)	—
Distributions to common unitholders and general partner	(11,240		)	(11,234		)
Distributions to preferred unitholders	(15,265		)	(1,250		)
Contributions to discontinued operations	(447		)	(329		)
Debt issuance costs and other	(741		)	(40,534		)
Net cash used in financing activities of continuing operations	$	(49,609	)	$	(55,851	)
Net cash provided by financing activities of discontinued operations	447			329
Net cash used in financing activities	$	(49,162	)	$	(55,522	)

Net increase in cash and cash equivalents	$	23,148		$	412
Cash and cash equivalents at beginning of period	29,827			40,371
Cash and cash equivalents at end of period	$	52,975		$	40,783

Supplemental cash flow information:
Cash paid during the period for interest from continuing operations	$	33,155		$	34,880
Non-cash investing and financing activities:
Plant, equipment and mineral rights funded with accounts payable or accrued liabilities	$	894		$	—
Issuance of 2022 Senior Notes in exchange for 2018 Senior Notes	$	—		$	240,638

The accompanying notes are an integral part of these consolidated financial statements.

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1. Basis of Presentation

Nature of Business

Natural Resource Partners L.P. (the "Partnership") engages principally in the business of owning, operating, managing and leasing a diversified portfolio of mineral properties in the United States, including interests in coal, natural soda ash from trona, construction aggregates and other natural resources. As used in these Notes to Consolidated Financial Statements, the terms "NRP," "we," "us" and "our" refer to Natural Resource Partners L.P. and its subsidiaries, unless otherwise stated or indicated by context.

Principles of Consolidation and Reporting

The accompanying unaudited Consolidated Financial Statements of the Partnership have been prepared in accordance with generally accepted accounting principles in the United States of America ("GAAP") for interim financial information and with Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In management's opinion, all necessary adjustments to fairly present the Partnership's results of operations, financial position and cash flows for the periods presented have been made and all such adjustments were of a normal and recurring nature. Certain reclassifications have been made to prior period amounts on the Statements of Comprehensive Income and Statements of Cash Flows to conform with current period presentation. These reclassifications had no impact on previously reported net income or cash flows from operating, investing or financing activities.

Recently Adopted Accounting Standards

Revenue Recognition. On January 1, 2018, NRP adopted accounting standard ASC 606, Revenue from Contracts with Customers, and all the related amendments (the “new revenue standard” and "ASC 606") to all open contracts using the modified retrospective method. The adoption of the new revenue standard impacted royalty revenue from NRP's coal and aggregates royalty leases as further described below. NRP recognized a $90.3 million cumulative effect of adoption adjustment in the opening balance of partners' capital on January 1, 2018. Prior year information has not been restated and continues to be reported under the accounting standards in effect for those periods. The new revenue standard had no impact on revenues from NRP's Construction Aggregates or Soda Ash operating segments.

A majority of NRP’s coal and aggregates royalty revenue continues to be recognized over the lease term based on production. For coal and aggregates royalty leases for which NRP expects consideration from minimum payments to be greater than consideration from production over the lease term, royalty revenue is now recognized straight-line over the lease term based on the minimum payment consideration.

The cumulative effects of the changes made to our Consolidated Balance Sheet at January 1, 2018 for the adoption of the new revenue standard were as follows:



(In thousands)	Balance at December 31, 2017		Adjustments due to ASC 606			Balance at January 1, 2018
Assets
Accounts receivable, net	$	47,026	$	3,479		$	50,505

Liabilities
Current portion of deferred revenue	$	—	$	1,973		$	1,973
Deferred revenue	100,605		(88,747		)	11,858

Partners’ capital
Common unitholders’ interest	$	199,851	$	88,448		$	288,299
General partner’s interest	1,857		1,805			3,662
Total partners’ capital	265,211		90,253			355,464

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

The impact of adoption of the new revenue standard on NRP’s Consolidated Balance Sheet and Consolidated Statements of Comprehensive Income was as follows:



	As of June 30, 2018
(In thousands)	As Reported		Balances without Adoption of ASC 606		Effect of Change
Assets
Accounts receivable, net	$	59,312	$	55,325	$	3,987
Total assets	1,411,806		1,407,819		3,987

Liabilities and capital
Current portion of deferred revenue	$	2,732	$	—	$	2,732
Deferred revenue	17,136		102,244		(85,108		)
Total liabilities	857,299		939,675		(82,376		)
Partners’ capital
Common unitholders’ interest	326,125		241,489		84,636
General partner’s interest	4,427		2,700		1,727
Total partners’ capital	392,496		306,133		86,363
Total liabilities and capital	1,411,806		1,407,819		3,987



	For the Three Months Ended June 30, 2018
(In thousands)	As Reported		Amounts without Adoption of ASC 606		Effect of Change
Coal royalty and other revenues	$	48,711	$	50,710	$	(1,999	)
Net income from continuing operations	39,123		41,315		(2,192		)
Net income	39,089		41,281		(2,192		)
Net income per common unit (basic)	2.46		2.64		(0.18		)
Net income per common unit (diluted)	1.75		1.85		(0.10		)



	For the Six Months Ended June 30, 2018
(In thousands)	As Reported		Amounts without Adoption of ASC 606		Effect of Change
Coal royalty and other revenues	$	94,684	$	98,381	$	(3,697	)
Net income from continuing operations	65,211		69,101		(3,890		)
Net income	65,163		69,053		(3,890		)
Net income per common unit (basic)	3.95		4.26		(0.31		)
Net income per common unit (diluted)	2.95		3.13		(0.18		)

Recently Issued Accounting Standards

Leases . In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). The new standard requires a lessee to recognize assets and liabilities on the balance sheet for the present value of the rights and obligations created by all leases with terms of more than 12 months. This standard does not apply to leases that explore for or use minerals, oil, natural gas and similar non-regenerative resources, including the intangible right to explore for those natural resources and rights to use the land in which those natural resources are contained. The guidance also requires disclosures designed to give financial statement users information on the amount, timing and uncertainty of cash flows arising from leases. The guidance is effective for annual and interim periods beginning after December 31, 2018 and is to be adopted using a modified retrospective approach. The Partnership is currently evaluating the impact of the provisions of this guidance on its consolidated financial statements.

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

2. Revenue from Contracts with Customers

Coal Royalty and Other Segment

The following table represents the Partnership's Coal Royalty and Other segment revenues (including affiliates) by major source:



	Three Months Ended		Six Months Ended
(In thousands)	June 30, 2018
Coal royalty revenue	$	31,407	$	60,098
Production lease minimum revenue	102		527
Minimum lease straight-line revenue	6,769		13,529
Wheelage revenue	1,641		3,615
Coal overriding royalty revenue	3,702		6,574
Aggregates royalty revenue	1,572		2,663
Oil and gas royalty revenue	1,354		4,252
Property tax revenue	1,523		2,705
Other revenue	829		1,146
Coal royalty and other revenues ⁽¹⁾	$	48,899	$	95,109
Transportation and processing services revenue ⁽²⁾	5,002		10,385
Total Coal royalty and other segment revenues	$	53,901	$	105,494


(1)	Represents revenue from contracts with customers as defined under ASC 606.

(2)

Revenue from contracts with customers as defined under ASC 606 was $3.1 million and $6.1 million for the three and six months ended June 30, 2018 , respectively. The remaining transportation and processing services revenue of $1.9 million and $4.3 million for the three and six months ended June 30, 2018 , respectively, relates to other NRP-owned infrastructure leased to and operated by third party operators accounted for under ASC 840, Leases.

Coal Royalty and Other segment revenues

Royalty-based leases. Approximately two-thirds of our royalty-based leases have initial terms of five to 40 years, with many lessees having the option to extend the lease for additional terms. For these types of leases, the lessees generally make payments to NRP based on the greater of a percentage of the gross sales price or a fixed price per ton of mineral they mine or sell. Most of NRP’s coal and aggregates royalty leases require the lessee to pay annual or quarterly minimum amounts, either made in advance or arrears, which are generally recoupable through actual royalty production over certain time periods that generally range from three to five years.

In accordance with previous accounting standards in effect prior to January 1, 2018, NRP recognized all coal and aggregates royalty revenue over the lease term based on coal or aggregates production. The recognition of revenue from minimum payments was deferred until either recoupment occurred or the recoupment period expired. Upon expiration, unrecouped minimums were recognized as revenue.

Under the new revenue recognition standard, management has defined NRP's coal and aggregates royalty lease performance obligation as providing the lessee the right to mine and sell NRP's coal or aggregates over the lease term. The Partnership then evaluated the likelihood that consideration NRP received from its coal and aggregates lessees resulting from production would exceed consideration received from minimum payments over the lease term.

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

As a result of this evaluation, revenue recognition from the Partnership's royalty-based leases is based on either production or minimum payments as follows:

•

Production Leases : Leases for which the Partnership expects that consideration from production will be greater than consideration from minimums over the lease term. Revenue recognition for these leases is recognized as Coal royalty revenue or Aggregates royalty revenue, as applicable, over time based on production. Deferred revenue, resulting from minimum consideration received, is recognized as royalty revenue either when recoupment occurs or as Production lease minimum revenue when either the recoupment period expires or when NRP determines that recoupment is remote (breakage).


•	Minimum Leases : Leases for which the Partnership expects that consideration from minimums will be greater than consideration from production over the lease term. Revenue recognition for these leases is recognized straight-line over the lease term based on the minimum consideration amount and is recognized in Minimum lease straight-line revenue.

Additionally, minimum payments contractually due are accrued and recognized in Accounts receivable, net, with an offset to Deferred revenue, and minimum payments received are recorded as Deferred revenue on NRP 's Consolidated Balance Sheets.

The Partnership also has overriding royalty revenue interests in certain oil and gas wells and coal reserves. Revenue from these interests is recognized over time based on when the respective commodities are sold.

Wheelage. Revenue related to fees collected per ton to transport foreign coal across property owned by the Partnership that is recognized over time as transportation across our property occurs.

Other revenue. Other revenue consists primarily of rental payments and surface damage fees related to certain land owned by the Partnership and is recognized straight-line over time as it is earned. Other revenues also include and property tax revenues, the majority of which are reimbursable by the lessee. Property taxes incurred on the Partnership's properties are recognized on a gross basis over time.

Transportation and processing services revenue. The Partnership owns transportation and processing infrastructure that is leased to third parties and collects throughput fees for which it recognizes revenue over time based on the coal tons transported over the beltlines or processed through the facilities.

Contract modifications

Contract modifications that impact the overall economics of the lease's potential future cash flows are evaluated in accordance with ASC 606. A majority of our contract modifications pertain to our coal and aggregates royalty contracts and include, but are not limited to, extending the lease term, changes to royalty rates, floor prices or minimum payments, assignment of the contract or termination due to the exhaustion of merchantable and mineable reserves. In accordance with the contract modification guidance in paragraphs 606-10-25-12 and 25-13, revenues from contracts that were modified before January 1, 2018 were not retrospectively restated for those modifications and instead reflected the aggregate effect of those modifications when identifying the satisfied and unsatisfied performance obligations, determining the transaction price and allocating the transaction price to the satisfied and unsatisfied performance obligation.

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

Contract Assets and Liabilities

The following table details the Partnership's Coal Royalty and Other segment receivables from contracts with customers and contract liabilities:



	June 30,		January 1,
(In thousands)	2018		2018
Receivables
Total accounts receivable, net (including affiliates)	$	30,448	$	24,047
Prepaid expenses and other ⁽¹⁾	2,163		2,830

Contract liabilities
Current portion of deferred revenue	$	2,732	$	1,973
Deferred revenue	17,136		11,858


(1)	Prepaid expenses and other includes notes receivable from contracts with customers.

The following table shows the activity related to the Partnership's Coal Royalty and Other segment deferred revenue:



(In thousands)	Six Months Ended June 30, 2018
Balance at December 31, 2017	$	100,605
Cumulative adjustment for change in accounting principle recognized in partners' capital	(86,774		)
Balance at January 1, 2018 (current and non-current)	$	13,831
Production leases - revenue impact
Recoupments recognized in Coal and aggregates royalty revenue	(4,630		)
Production lease minimum revenue	(393		)
Minimum leases - revenue impact
Minimum lease amortization recognized in Minimum lease straight-line revenue	(1,958		)
Contractual minimums due	956
Cash received for minimum payments	12,062
Balance at June 30, 2018 (current and non-current)	$	19,868

The following table shows the Partnership's Coal Royalty and Other segment revenue recognized during the three months ended June 30, 2018 that was included in the deferred revenue balance at the beginning of the period:



(In thousands)
Production leases - revenue impact
Recoupments recognized in Coal and aggregates royalty revenue	(2,365	)
Production lease minimum revenue	(21	)
Minimum leases - revenue impact
Minimum lease amortization recognized in Minimum lease straight-line revenue	(1,005	)

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

Remaining Performance Obligations

The Partnership's non-cancelable annual minimum payments due under the lease terms of its coal and aggregates royalty leases are as follows:



	Weighted Average Remaining Years as of June 30, 2018	Annual Minimum Payments (In thousands)
Lease Term ⁽¹⁾	Weighted Average Remaining Years as of June 30, 2018	Annual Minimum Payments (In thousands)
1 - 5 years	0.2	$	7,888
6 - 10 years	2.4	27,439
10+ years	8.2	44,166


(1)	The Partnership applied the practical expedient for disclosing remaining performance obligations for contracts with an expected duration of one year or less, and have excluded those contracts from this disclosure.

The Partnership's non-cancelable annual minimum payments on its coal and aggregates royalty leases are recognized as revenue as discussed above. In addition, the Partnership's non-cancelable annual minimum payments due under terms of its coal and aggregates overriding royalty agreements include a $1.8 million annual minimum that expires in 2023 and a $1.0 million minimum that expires upon exhaustion of the mineable and recoverable coal reserves, respectively.

Construction Aggregates Segment

The Partnership's Construction Aggregates segment revenues from contracts with customers by major source are as follows:



	Three Months Ended		Six Months Ended
(In thousands)	June 30, 2018
Crushed stone, sand and gravel	$	18,070	$	31,809
Delivery and fuel income	11,678		21,761
Other revenues	4,485		7,087
Total construction aggregates revenues	$	34,233	$	60,657
Road construction and asphalt paving services	6,176		6,904
Total construction aggregates segment revenues	$	40,409	$	67,561

Construction Aggregates segment revenues

The majority of the Construction Aggregates segment revenues is recognized at a point in time with the exception of revenue related to construction contracts recognized on the percentage-of-completion method as discussed below. The majority of the Partnership's construction contracts have an original expected duration of one year or less. As such, the Partnership has elected to apply the practical expedient and not disclose remaining performance obligations for contracts with an original expected duration of one year or less. Additional discussion of the Partnership's major sources of Construction Aggregates segment revenue are as follows:

Crushed stone, sand and gravel and other revenues. Revenue from the sale of crushed stone, sand, gravel and asphalt is recognized based on a fixed price when title is transferred to the buyer and collectibility of the sales proceeds is reasonably assured (typically occurs when products are picked up or delivered to the customer). Other revenues consist of brokered stone sales and barge and service revenues. Brokered stone sales include aggregates purchases from third party quarries, which are then sold and transported to customers and recorded as revenue at the time of delivery. The purchase price of the aggregates from the third party quarries are recorded as expenses. Barge and service revenues relate to loading and unloading services at marine terminals and are recorded as revenue at the time the service is performed.

Delivery and fuel income. Revenue related to pass through delivery and fuel costs the Partnership incurs to deliver its products is recognized on a gross basis and is subsequently reimbursed by the customer. The related costs are recognized when incurred and are included in Operating and maintenance expenses on the Consolidated Statements of Comprehensive Income.

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

Road construction and asphalt paving services revenue. Revenue related to construction contracts is recognized on the percentage-of-completion method, measured by the percentage of total costs incurred to date to the estimated total costs for each contract.

The Partnership had $24.7 million and $23.0 million in receivables from Construction Aggregates segment related contracts with customers included in Accounts receivable, net on its Consolidated Balance Sheets as of June 30, 2018 and January 1, 2018, respectively.

3. Class A Convertible Preferred Units

On March 2, 2017, NRP issued $250 million of Class A Convertible Preferred Units representing limited partner interests in NRP (the "Preferred Units") to certain entities controlled by funds affiliated with The Blackstone Group, L.P. (collectively referred to as "Blackstone") and certain affiliates of GoldenTree Asset Management LP (collectively referred to as "GoldenTree") (together the "Preferred Purchasers") pursuant to a Preferred Unit and Warrant Purchase Agreement. NRP issued 250,000 Preferred Units to the Preferred Purchasers at a price of $1,000 per Preferred Unit (the "Per Unit Purchase Price"), less a 2.5% structuring and origination fee. The Preferred Units entitle the Preferred Purchasers to receive cumulative distributions at a rate of 12% per year, up to one half of which NRP may pay in additional Preferred Units (such additional Preferred Units, the "paid-in-kind units" or "PIK Units"), subject to approval by the Board of Directors.

During the six months ended June 30, 2018 , the Partnership redeemed all of the outstanding PIK Units, which resulted in an $8.8 million cash payment during the period.

Activity related to the Preferred Units is as follows from December 31, 2017 to June 30, 2018 :



(In thousands, except unit data)	Units Outstanding		Financial Position
Balance at December 31, 2017	258,844		$	173,431
Redemption of PIK Units	(8,844	)	(8,844		)
Balance at June 30, 2018	250,000		$	164,587

4. Common and Preferred Unit Distributions

The Partnership makes cash distributions to common unitholders on a quarterly basis, subject to approval by the Board of Directors. As discussed in Note 3 above, the Partnership also makes distributions to the preferred unitholders.

Common Unit Distributions

Distributions made on the common units and the general partner's general partner ("GP") interest are made on a pro-rata basis in accordance with their relative percentage interests in the Partnership. The general partner is entitled to receive 2% of such distributions. The following table shows the distributions declared and paid to common unitholders during the six months ended June 30, 2018 and 2017 , respectively:



				Total Distributions (in thousands)
Date Paid	Period Covered by Distribution	Distribution per Common Unit		Common Units		GP Interest		Total
2018
February 14, 2018	October 1 - December 31, 2017	$	0.45	$	5,505	$	112	$	5,617
May 14, 2018	January 1 - March 31, 2018	$	0.45	$	5,510	$	113	$	5,623

2017
February 14, 2017	October 1 - December 31, 2016	$	0.45	$	5,503	$	112	$	5,615
May 12, 2017	January 1 - March 31, 2017	$	0.45	$	5,506	$	113	$	5,619

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

Preferred Unit Distributions

The following table shows the distributions declared and paid to Preferred Unitholders during the six months ended June 30, 2018 and 2017 , respectively:



Date Paid	Period Covered by Distribution	Distribution per Preferred Unit		Total Distribution Declared (in thousands)
2018
February 7, 2018	October 1 - December 31, 2017	$	30.00	$	7,765
May 14, 2018	January 1 - March 31, 2018	$	30.00	$	7,500

2017
May 30, 2017	March 2 - March 31, 2017	$	5.00	$	2,500

Income available to common unitholders and the general partner is reduced by Preferred Unit distributions that accumulated during the period. During the three and six months ended June 30, 2018 , NRP reduced net income attributable to common unitholders and the general partner by $7.5 million and $15.0 million , respectively, as a result of accumulated Preferred Unit distributions earned during the period. The $7.5 million Preferred Unit distribution earned during the three months ended June 30, 2018 will be paid on August 14, 2018.

5. Net Income Per Common Unit

Basic net income per common unit is computed by dividing net income, after considering income attributable to preferred unitholders and the general partner’s general partner interest, by the weighted average number of common units outstanding. Diluted net income per common unit includes the effect of NRP's Preferred Units and Warrants, if the inclusion of these items is dilutive.

The dilutive effect of the Preferred Units is calculated using the if-converted method. Under the if-converted method, the Preferred Units are assumed to be converted at the beginning of the period, and the resulting common units are included in the denominator of the diluted net income per unit calculation for the period being presented. Distributions declared in the period and undeclared distributions on the Preferred Units that accumulated during the period are added back to the numerator for purposes of the if-converted calculation.

The dilutive effect of the Warrants is calculated using the treasury stock method, which assumes that the proceeds from the exercise of these instruments are used to purchase common units at the average market price for the period. The calculation of the dilutive effect of the Warrants for the three and six months ended June 30, 2018 and 2017 did not include the net settlement of Warrants to purchase 2.25 million common units with a strike price of $34.00 because the impact would have been anti-dilutive.

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

The following table reconciles the numerators and denominators of the basic and diluted net income per common unit computations and calculates basic and diluted net income per common unit:



	Three Months Ended June 30,						Six Months Ended June 30,
(In thousands, except per unit data)	2018			2017			2018			2017
Allocation of net income:
Net income from continuing operations	$	39,123		$	25,857		$	65,211		$	31,968
Less: net income attributable to non-controlling interest	(869		)	—			(869		)	—
Less: income attributable to preferred unitholders	(7,500		)	(7,538		)	(15,000		)	(10,038		)
Net income from continuing operations attributable to common unitholders and general partner	$	30,754		$	18,319		$	49,342		$	21,930
Less: net income from continuing operations attributable to the general partner	(616		)	(434		)	(987		)	(438		)
Net income from continuing operations attributable to common unitholders	$	30,138		$	17,885		$	48,355		$	21,492

Net income (loss) from discontinued operations	$	(34	)	$	133		$	(48	)	$	(74	)
Less: net income (loss) from discontinued operations attributable to the general partner	1			(3		)	1			1
Net income (loss) from discontinued operations attributable to common unitholders	$	(33	)	$	130		$	(47	)	$	(73	)

Net income	$	39,089		$	25,990		$	65,163		$	31,894
Less: net income attributable to non-controlling interest	(869		)	—			(869		)	—
Less: income attributable to preferred unitholders	(7,500		)	(7,538		)	(15,000		)	(10,038		)
Net income attributable to common unitholders and general partner	$	30,720		$	18,452		$	49,294		$	21,856
Less: net income attributable to the general partner	(615		)	(437		)	(986		)	(437		)
Net income attributable to common unitholders	$	30,105		$	18,015		$	48,308		$	21,419

Basic income (loss) per common unit:
Weighted average common units—basic	12,246			12,232			12,242			12,232
Basic net income from continuing operations per common unit	$	2.46		$	1.46		$	3.95		$	1.76
Basic net income (loss) from discontinued operations per common unit	$	—		$	0.01		$	—		$	(0.01	)
Basic net income per common unit	$	2.46		$	1.47		$	3.95		$	1.75

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)



	Three Months Ended June 30,						Six Months Ended June 30,
(In thousands, except per unit data)	2018			2017			2018			2017
Diluted income (loss) per common unit:
Weighted average common units—basic	12,246			12,232			12,242			12,232
Plus: dilutive effect of Warrants	522			467			476			361
Plus: dilutive effect of Preferred Units	8,615			9,760			8,615			6,517
Weighted average common units—diluted	21,383			22,459			21,333			19,110

Net income from continuing operations	$	39,123		$	25,857		$	65,211		$	31,968
Less: net income attributable to non-controlling interest	(869		)	—			(869		)	—
Diluted net income from continuing operations attributable to common unitholders and general partner	$	38,254		$	25,857		$	64,342		$	31,968
Less: diluted net income from continuing operations attributable to the general partner	(766		)	(586		)	(1,287		)	(639		)
Diluted net income from continuing operations attributable to common unitholders	$	37,488		$	25,271		$	63,055		$	31,329

Diluted net income (loss) from discontinued operations attributable to common unitholders	$	(33	)	$	130		$	(47	)	$	(73	)

Net income	$	39,089		$	25,990		$	65,163		$	31,894
Less: net income attributable to non-controlling interest	(869		)	—			(869		)	—
Diluted net income attributable to common unitholders and general partner	$	38,220		$	25,990		$	64,294		$	31,894
Less: diluted net income attributable to the general partner	(765		)	(589		)	(1,286		)	(638		)
Diluted net income attributable to common unitholders	$	37,455		$	25,401		$	63,008		$	31,256

Diluted net income from continuing operations per common unit	$	1.75		$	1.13		$	2.96		$	1.64
Diluted net income (loss) from discontinued operations per common unit	$	—		$	—		$	—		$	—
Diluted net income per common unit	$	1.75		$	1.13		$	2.95		$	1.64

6. Segment Information

The Partnership's operating segments are strategic business units that offer distinct products and services to different customers in different geographies within the U.S. that are managed accordingly. NRP has the following three operating segments:

Coal Royalty and Other —consists primarily of coal royalty and coal-related transportation and processing assets. Other assets include aggregates royalty, industrial mineral royalty, oil and gas royalty and timber. The Partnership's coal reserves are primarily located in Appalachia, the Illinois Basin and the western United States. The Partnership's aggregates and industrial minerals properties are located in a number of states across the United States. The Partnership's oil and gas royalty assets are primarily located in Louisiana and Pennsylvania.

Soda Ash —consists of the Partnership's 49% non-controlling equity interest in Ciner Wyoming, a trona ore mining operation and soda ash refinery in the Green River Basin of Wyoming. Ciner Resources LP, the Partnership's operating partner, mines the trona, processes it into soda ash, and distributes the soda ash both domestically and internationally to the glass and chemicals industries. The Partnership receives regular quarterly distributions from Ciner Wyoming.

Construction Aggregates —consists of the Partnership's construction aggregates materials business that operates hard rock quarries, an underground limestone mine, sand and gravel plants, asphalt plants and marine terminals. Construction Aggregates operates in Pennsylvania, West Virginia, Tennessee, Kentucky and Louisiana.

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

Direct segment costs and certain other costs incurred at the corporate level that are identifiable and that benefit the Partnership's segments are allocated to the operating segments accordingly. These allocated costs generally include: insurance, taxes, legal, information technology and shared facilities services and are included in Operating and maintenance expenses and Operating and maintenance expenses—affiliates on the Consolidated Statements of Comprehensive Income. Intersegment sales are at prices that approximate market and are eliminated on the Partnership's Consolidated Statements of Comprehensive Income.

Corporate and Financing includes functional corporate departments that do not earn revenues. Costs incurred by these departments include interest and financing, corporate headquarters and overhead, centralized treasury and accounting and other corporate-level activity not specifically allocated to a segment and are included in General and administrative expenses and General and administrative expenses—affiliates on the Consolidated Statements of Comprehensive Income.

The following table summarizes certain financial information for each of the Partnership's operating segments:



	Operating Segments
(In thousands)	Coal Royalty and Other		Soda Ash		Construction Aggregates			Corporate and Financing			Total
Three Months Ended June 30, 2018
Revenues (including affiliates)	$	53,901	$	16,529	$	40,409		$	—		$	110,839
Intersegment revenues (expenses)	74		—		(74		)	—			—
Gain on asset sales, net	168		—		42			—			210
Operating and maintenance expenses (including affiliates)	8,117		—		34,249			—			42,366
Depreciation, depletion and amortization	5,376		—		3,187			—			8,563
General and administrative (including affiliates)	—		—		—			3,263			3,263
Other expense, net	—		—		—			17,734			17,734
Net income (loss) from continuing operations	40,650		16,529		2,941			(20,997		)	39,123
Loss from discontinued operations	—		—		—			—			(34		)

Three Months Ended June 30, 2017
Revenues (including affiliates)	$	49,626	$	8,389	$	33,555		$	—		$	91,570
Intersegment revenues (expenses)	68		—		(68		)	—			—
Gain on asset sales, net	3,184		—		177			—			3,361
Operating and maintenance expenses (including affiliates)	5,419		—		27,820			—			33,239
Depreciation, depletion and amortization (including affiliates)	5,375		—		3,030			—			8,405
General and administrative (including affiliates)	—		—		—			2,883			2,883
Other expense, net	—		—		178			24,369			24,547
Net income (loss) from continuing operations	42,084		8,389		2,636			(27,252		)	25,857
Income from discontinued operations	—		—		—			—			133

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)



	Operating Segments
(In thousands)	Coal Royalty and Other		Soda Ash		Construction Aggregates			Corporate and Financing			Total
Six Months Ended June 30, 2018
Revenues (including affiliates)	$	105,494	$	26,150	$	67,561		$	—		$	199,205
Intersegment revenues (expenses)	115		—		(115		)	—			—
Gain on asset sales, net	819		—		51			—			870
Operating and maintenance expenses (including affiliates)	14,332		—		60,467			—			74,799
Depreciation, depletion and amortization	10,476		—		6,044			—			16,520
General and administrative (including affiliates)	—		—		—			7,599			7,599
Asset impairment	242		—		—			—			242
Other expense, net	—		—		20			35,684			35,704
Net income (loss) from continuing operations	81,378		26,150		966			(43,283		)	65,211
Loss from discontinued operations	—		—		—			—			(48		)

Six Months Ended June 30, 2017
Revenues (including affiliates)	$	100,764	$	18,683	$	60,776		$	—		$	180,223
Intersegment revenues (expenses)	130		—		(130		)	—			—
Gain on asset sales, net	3,213		—		192			—			3,405
Operating and maintenance expenses (including affiliates)	12,803		—		52,619			—			65,422
Depreciation, depletion and amortization (including affiliates)	12,348		—		6,549			—			18,897
General and administrative (including affiliates)	—		—		—			10,085			10,085
Asset impairment	1,778		—		—			—			1,778
Other expense, net	—		—		573			54,905			55,478
Net income (loss) from continuing operations	77,178		18,683		1,097			(64,990		)	31,968
Loss from discontinued operations	—		—		—			—			(74		)

As of June 30, 2018
Total assets of continuing operations	$	967,627	$	245,524	$	193,721		$	3,946		$	1,410,818
Total assets of discontinued operations	—		—		—			—			988

As of December 31, 2017
Total assets of continuing operations	$	945,237	$	245,433	$	191,374		$	6,129		$	1,388,173
Total assets of discontinued operations	—		—		—			—			991

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

7. Equity Investment

The Partnership accounts for its 49% investment in Ciner Wyoming using the equity method of accounting. Activity related to this investment is as follows:



	Three Months Ended June 30,						Six Months Ended June 30,
(In thousands)	2018			2017			2018			2017
Balance at beginning of period	$	241,679		$	252,803		$	245,433		$	255,901
Income allocation to NRP’s equity interests	17,657			9,274			28,489			20,754
Amortization of basis difference	(1,128		)	(885		)	(2,339		)	(2,071		)
Comprehensive loss from unconsolidated investment	(434		)	(23		)	(1,559		)	(1,165		)
Distribution	(12,250		)	(12,250		)	(24,500		)	(24,500		)
Balance at end of period	$	245,524		$	248,919		$	245,524		$	248,919

The following table represents summarized financial information for Ciner Wyoming as derived from the respective unaudited financial statements for the three and six months ended June 30, 2018 and 2017 , respectively:



	Three Months Ended June 30,				Six Months Ended June 30,
(In thousands)	2018		2017		2018		2017
Sales	$	91,882	$	119,737	$	213,101	$	246,309
Gross profit	14,022		24,219		42,244		52,916
Net Income	36,035		18,926		58,142		42,354

8. Plant and Equipment, Net

The Partnership’s plant and equipment consist of the following:



	June 30,			December 31,
(In thousands)	2018			2017
Plant and equipment	$	89,686		$	84,173
Construction in process	1,383			803
Less accumulated depreciation	(43,152		)	(38,806		)
Total plant and equipment, net	$	47,917		$	46,170

Depreciation expense included in Depreciation, depletion and amortization on the Partnership's Consolidated Statements of Comprehensive Income totaled $2.6 million and $2.5 million for the three months ended June 30, 2018 and 2017 , respectively. Depreciation expense totaled $5.0 million and $5.4 million for the six months ended June 30, 2018 and 2017 , respectively.

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

9. Mineral Rights, Net

The Partnership’s mineral rights consist of the following:



	June 30, 2018
(In thousands)	Carrying Value		Accumulated Depletion			Net Book Value
Coal properties	$	1,169,862	$	(444,332	)	$	725,530
Aggregates properties	150,642		(19,103		)	131,539
Oil and gas royalty properties	12,395		(7,395		)	5,000
Other	13,161		(1,514		)	11,647
Total mineral rights, net	$	1,346,060	$	(472,344	)	$	873,716



	December 31, 2017
(In thousands)	Carrying Value		Accumulated Depletion			Net Book Value
Coal properties	$	1,170,104	$	(436,964	)	$	733,140
Aggregates properties	150,642		(16,836		)	133,806
Oil and gas royalty properties	12,395		(7,158		)	5,237
Other	13,168		(1,466		)	11,702
Total mineral rights, net	$	1,346,309	$	(462,424	)	$	883,885

Depletion expense related to the Partnership’s mineral rights is included in Depreciation, depletion and amortization on the Partnership's Consolidated Statements of Comprehensive Income and totaled $5.1 million and $5.0 million for the three months ended June 30, 2018 and 2017 , respectively. Depletion expense related to the Partnership’s mineral rights totaled $9.9 million and $11.7 million for the six months ended June 30, 2018 and 2017 , respectively.

In April 2018, Foresight Energy LP ("Foresight Energy") made a filing with the SEC indicating its intent to permanently close the Deer Run mine operated by its subsidiary Hillsboro Energy LLC ("Hillsboro") if the coal mining lease is terminated by the Court in connection with the ongoing litigation relating thereto. Refer to Note 15. Commitments and Contingencies —Legal —Foresight Energy Disputes for more information on this litigation. In addition, in its June 30, 2018 Form 10-Q, Foresight Energy disclosed that they recorded an impairment charge of $110.7 million during the three months ended June 30, 2018 related to mineral reserves, buildings and structures, machinery and equipment, and other related assets that Foresight Energy does not expect to generate future positive cash flows at the Deer Run mine.

The Partnership has evaluated the impact of this impairment recognized by Foresight Energy on its estimate of future cash flows from its Hillsboro property. To the extent the Partnership is unable to generate sufficient cash flow, the carrying value of the Partnership's reserves could be impaired. However, NRP believes there is no basis for termination of the lease, and the lease will remain in full force and effect unless the Court ultimately declares the lease terminated. Further, NRP believes that the approximately 179 million tons of estimated coal reserves at the Deer Run mine have substantial economic value. As of June 30, 2018 the Partnership has concluded there is no indicator of impairment of the $235 million net book value of the Partnership's reserves at the Deer Run mine. NRP will continue to assess the expected cash flow from this property in future periods.

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

10. Intangible Assets, Net

The Partnership's intangible assets primarily consist of above-market coal transportation contracts with subsidiaries of Foresight Energy in which the Partnership receives throughput fees for the handling and transportation of coal. The Partnership's intangible assets also include permits, aggregates-related trade names and other agreements. The Partnership's intangible assets included on its Consolidated Balance Sheets are as follows:



	June 30,			December 31,
(In thousands)	2018			2017
Intangible assets	$	86,336		$	86,336
Less: accumulated amortization	(38,412		)	(36,782		)
Total intangible assets, net	$	47,924		$	49,554

Amortization expense included in Depreciation, depletion and amortization on the Partnership's Consolidated Statements of Comprehensive Income was $0.8 million and $0.6 million for the three months ended June 30, 2018 and 2017 , respectively. Amortization expense included in Depreciation, depletion and amortization on the Partnership's Consolidated Statements of Comprehensive Income was $1.6 million and $0.8 million for the six months ended June 30, 2018 and 2017 , respectively. Amortization expense included in amortization expense—affiliates on the Partnership's Consolidated Statements of Comprehensive Income was $0.2 million and $1.0 million for the three and six months ended June 30, 2017 . As of May 9, 2017, Foresight Energy was no longer deemed to be an affiliate of the Partnership. Refer to Note 13. Related Party Transactions for additional details.

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

11. Debt, Net

The Partnership's debt consists of the following:



	June 30,			December 31,
(In thousands)	2018			2017
NRP LP debt:
10.500% senior notes, with semi-annual interest payments in March and September, due March 2022, $241 million issued at par and $105 million issued at 98.75%	$	345,638		$	345,638
Opco debt:
Revolving credit facility	95,000			60,000
Senior notes
4.91% with semi-annual interest payments in June and December, with annual principal payments in June, due June 2018	—			4,586
8.38% with semi-annual interest payments in March and September, with annual principal payments in March, due March 2019	21,334			42,670
5.05% with semi-annual interest payments in January and July, with annual principal payments in July, due July 2020	22,946			22,946
5.55% with semi-annual interest payments in June and December, with annual principal payments in June, due June 2023	13,429			16,115
4.73% with semi-annual interest payments in June and December, with annual principal payments in December, due December 2023	44,693			44,693
5.82% with semi-annual interest payments in March and September, with annual principal payments in March, due March 2024	89,589			104,520
8.92% with semi-annual interest payments in March and September, with annual principal payments in March, due March 2024	27,200			31,733
5.03% with semi-annual interest payments in June and December, with annual principal payments in December, due December 2026	120,547			120,547
5.18% with semi-annual interest payments in June and December, with annual principal payments in December, due December 2026	34,396			34,396
	$	814,772		$	827,844
Net unamortized debt discount	(1,463		)	(1,661		)
Net unamortized debt issuance costs	(14,974		)	(16,835		)
Total debt, net	$	798,335		$	809,348
Less: current portion of long-term debt	75,188			79,740
Total long-term debt, net	$	723,147		$	729,608

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

NRP LP Debt

2022 Senior Notes

As of June 30, 2018 and December 31, 2017 , NRP and NRP Finance were in compliance with the terms of their debt agreements.

Opco Debt

All of Opco’s debt is guaranteed by its wholly owned subsidiaries and is secured by certain of the assets of Opco and its wholly owned subsidiaries other than NRP Trona LLC. As of June 30, 2018 and December 31, 2017 , Opco was in compliance with the terms of the financial covenants contained in its debt agreements.

Opco Credit Facility

Opco’s Third Amended and Restated Credit Agreement, as amended (the "Opco Credit Facility"), matures on April 30, 2020. As of June 30, 2018 , Opco had $95.0 million of indebtedness outstanding and $55.0 million in available borrowing capacity under the Opco Credit Facility. The commitments under the Opco Credit Facility will be reduced from $150 million to $100 million at December 31, 2018 and remaining at $100 million through maturity in April 2020.

The weighted average interest rates for the borrowings outstanding under the Opco Credit Facility for the three months ended June 30, 2018 was 6.18% . There were no outstanding borrowings during the three months ended June 30, 2017. The weighted average interest rates for the borrowings outstanding under the Opco Credit Facility for six months ended June 30, 2018 and 2017 were 6.08% and 5.22% , respectively. Debt issue cost related to the Opco credit facility were $3.1 million and $4.6 million at June 30, 2018 and December 31, 2017 , respectively, and have been capitalized and included in Other assets on the Partnership's Consolidated Balance Sheets.

The Opco Credit Facility is collateralized and secured by liens on certain of Opco’s assets with carrying values of $642.6 and $649.7 million classified as Land, Plant and equipment and Mineral rights on the Partnership’s Consolidated Balance Sheet as of June 30, 2018 and December 31, 2017 , respectively.

Opco Senior Notes

As of June 30, 2018 and December 31, 2017 , the private placement senior notes ("Opco Senior Notes") had cumulative principal balances of $374.1 million and $422.2 million , respectively. Opco made mandatory principal payments of $48.1 million during the six months ended June 30, 2018 and June 30, 2017 , respectively.

The 8.38% and 8.92% Opco Senior Notes also provide that in the event that Opco’s leverage ratio of consolidated indebtedness to consolidated EBITDDA (as defined in the Note Purchase Agreements) exceeds 3.75 to 1.00 at the end of any fiscal quarter, then in addition to all other interest accruing on these notes, additional interest in the amount of 2.00% per annum shall accrue on the notes for the two succeeding quarters and for as long thereafter as the leverage ratio remains above 3.75 to 1.00. Opco has not exceeded the 3.75 to 1.00 ratio at the end of any fiscal quarter through June 30, 2018 .

12. Fair Value Measurements

Fair Value of Financial Instruments

The Partnership’s financial instruments consist of cash and cash equivalents, accounts receivable, contracts receivable, accounts payable, debt, Preferred Units and warrants. The carrying amounts reported on the Consolidated Balance Sheets for cash and cash equivalents, accounts receivable and accounts payable approximate fair value due to their short-term nature. There were no transfers between Level 1, Level 2 or Level 3 of the fair value hierarchy during the three and six months ended June 30, 2018 or 2017 .

The Partnership uses available market data and valuation methodologies to estimate the fair value of debt. The fair value of debt is the estimated amount the Partnership would have to pay a third party to assume the debt, including a credit spread for the difference between the issue rate and the period end market rate. The credit spread is the Partnership's default or repayment risk.

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

The following table shows the carrying amount and estimated fair value of the Partnership's debt and contracts receivable:



	June 30, 2018				December 31, 2017
(In thousands)	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Debt:
NRP 2022 Senior Notes ⁽¹⁾	$	332,214	$	372,857	$	330,404	$	366,376
Opco Senior Notes ⁽²⁾	371,121		403,597		418,944		447,538
Opco Revolving Credit Facility ⁽³⁾	95,000		95,000		60,000		60,000

Assets:
Contracts receivable, current and long-term ⁽⁴⁾	$	42,061	$	29,491	$	43,826	$	30,517


(1)	The Level 1 fair value is based upon quotations obtained for identical instruments on the closing trading prices near period end.


(2)	Due to no observable quoted prices on these instruments, the Level 3 fair value is estimated by management using quotations obtained for the NRP Senior Notes on the closing trading prices near period end.


(3)	The Level 3 fair value approximates the outstanding borrowing amount because the interest rates are variable and reflective of market rates and the terms of the credit facility allow the Partnership to repay this debt at any time without penalty.


(4)	The Level 3 fair value is determined based on the present value of future cash flow projections related to the underlying assets.

NRP has embedded derivatives in the Preferred Units related to certain conversion options, redemption features and the change of control provision that are accounted for separately from the Preferred Units as assets and liabilities at fair value on the Partnership's Consolidated Balance Sheets. Level 3 valuation of the embedded derivatives are based on numerous factors including the likelihood of the event occurring. The embedded derivatives are revalued quarterly, and changes in their fair value would be recorded in other income (expense) in the Partnership's Consolidated Statements of Comprehensive Income. The embedded derivatives had zero value as of June 30, 2018 and December 31, 2017 .

13. Related Party Transactions

Cline Affiliates and Foresight Energy L.P.

Mr. Chris Cline, both individually and through another affiliate, Adena Minerals, LLC ("Adena"), owned a 31% interest in NRP (GP) LP, NRP's general partner ("NRP GP"), through May 9, 2017. On May 9, 2017, Adena sold its 31% limited partner interest in NRP GP to Great Northern Properties Limited Partnership (“GNPLP”) and Western Pocahontas Properties Limited Partnership ("WPPLP") (the “Adena Sale”). GNPLP and WPPLP are companies controlled by Corbin J. Robertson, the Chairman and Chief Executive Officer of GP Natural Resource Partners LLC (the general partner of NRP GP) (“GP LLC”). Upon closing of this transaction, NRP no longer considers the various companies affiliated with Chris Cline, including Foresight Energy to be affiliates of NRP. As a result, all transactions (including revenues, expenses and cash flows) after May 9, 2017 with the various companies affiliated with Chris Cline are considered to be third party transactions.

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

Revenues and expenses related to transactions with Foresight Energy are included in the Partnership's Consolidated Statements of Comprehensive Income as follows:



	Three Months Ended June 30,				Six Months Ended June 30,
(In thousands)	2018		2017		2018		2017
Revenues
Coal royalty and other	$	8,022	$	643	$	15,070	$	643
Coal royalty and other—affiliates	—		10,051		—		21,203
Transportation and processing services	4,968		4,146		10,351		4,146
Transportation and processing services—affiliate	—		1,374		—		6,013

Expenses
Operating and maintenance expense	$	411	$	285	$	812	$	285
Operating and maintenance expense—affiliates	—		117		—		452

Coal Royalty and Other Revenues

Various subsidiaries of Foresight Energy lease coal reserves from the Partnership. In addition, NRP owns a contractual overriding royalty interest at Foresight Energy's Sugar Camp mine in the Illinois Basin which provides for payments based upon production from specific tons at Foresight Energy's Sugar Camp operations on certain reserves owned by another affiliate of Chris Cline. This overriding royalty is accounted for as a financing arrangement. Revenues related to these transactions are included in Coal royalty and other revenues in the Partnership's Consolidated Statements of Comprehensive Income.

Transportation and Processing Services Revenues and Expenses

The Partnership owns transportation and processing infrastructure related to certain of its coal properties, including loadout and other transportation assets at Foresight Energy's Williamson and Macoupin mines in the Illinois Basin, for which it collects throughput fees. These fees are are included in Transportation and processing services revenues in the Partnership's Consolidated Statements of Comprehensive Income.

NRP is responsible for operating and maintaining the rail load out transportation assets at the Williamson mine and subcontracts the operating responsibilities to a subsidiary of Foresight Energy. Expenses related to these transactions with Foresight Energy are included in Operating and maintenance expenses in the Partnership's Consolidated Statements of Comprehensive Income.

In addition, NRP owns rail loadout and associated infrastructure at the Sugar Camp mine, an Illinois Basin mine also operated by a subsidiary of Foresight Energy LP. While the Partnership owns coal reserves at the Williamson and Macoupin mines, it does not own coal reserves at the Sugar Camp mine. The infrastructure at the Sugar Camp mine is leased to third parties and NRP collects throughput fees, which are included in Transportation and processing services revenues in the Partnership's Consolidated Statements of Comprehensive Income.

NRP's Sugar Camp rail load out lease with a subsidiary of Foresight Energy is accounted for as a financing lease. The following table shows certain amounts related to NRP's Sugar Camp rail load out facility financing lease:



	June 30,		December 31,
(In thousands)	2018		2017
Projected remaining payments	$	68,977	$	71,452
Unearned income	26,695		28,366

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

Reimbursements to Affiliates of our General Partner

The Partnership’s general partner does not receive any management fee or other compensation for its management of NRP. However, in accordance with the partnership agreement, the general partner and its affiliates are reimbursed for services provided to the Partnership and for expenses incurred on the Partnership’s behalf. Employees of Quintana Minerals Corporation ("QMC") and WPPLP, affiliates of the Partnership, provide their services to manage the Partnership's business. QMC and WPPLP charge the Partnership the portion of their employee salary and benefits costs related to their employee services provided to NRP. These QMC and WPPLP employee management service costs are presented as Operating and maintenance expenses—affiliates and General and administrative—affiliates on the Partnership's Consolidated Statements of Comprehensive Income. NRP also reimburses overhead costs incurred by its affiliates to manage the Partnership's business. These overhead costs include certain rent, legal, accounting, treasury, information technology, insurance, administration of employee benefits and other corporate services incurred by or on behalf of the Partnership’s general partner and its affiliates and are presented as Operating and maintenance expenses—affiliates and General and administrative—affiliates on the Partnership's Consolidated Statements of Comprehensive Income.

Direct general and administrative expenses charged to the Partnership by QMC and WPPLP are included in the Partnership's Consolidated Statement of Comprehensive Income as follows:



	Three Months Ended June 30,				Six Months Ended June 30,
(In thousands)	2018		2017		2018		2017
Operating and maintenance expenses—affiliates	$	1,727	$	1,799	$	3,634	$	3,965
General and administrative—affiliates	849		852		1,780		1,976

During the three months ended June 30, 2018 and 2017 , the Partnership recognized $2.3 million and $0.3 million in Operating and maintenance expenses—affiliates, respectively, on its Consolidated Statements of Comprehensive Income related to a non-participating production royalty payable to WPPLP pursuant to a conveyance agreement entered into in 2007 in which coal royalty revenues received from a third party by NRP are passed back to WPPLP. These charges were $2.9 million and $0.4 million during the six months ended June 30, 2018 and 2017 , respectively.

At December 31, 2017 , the Partnership had Other assets—affiliate from WPPLP on its Consolidated Balance Sheets related to a non-production royalty receivable from WPPLP for overriding royalty interest of $0.2 million .

The Partnership had Accounts payable—affiliates on its Consolidated Balance Sheets to QMC of $0.4 million and WPPLP of $1.1 million as of June 30, 2018 and to QMC of $0.4 million and WPPLP of $0.1 million as of December 31, 2017 .

Quintana Capital Group GP, Ltd.

Corbin J. Robertson, Jr. is a principal in Quintana Capital Group GP, Ltd. ("Quintana Capital"), which controls several private equity funds focused on investments in the energy business. In connection with the formation of Quintana Capital, the Partnership adopted a formal conflicts policy that establishes the opportunities that will be pursued by the Partnership and those that will be pursued by Quintana Capital. The governance documents of Quintana Capital’s affiliated investment funds reflect the guidelines set forth in the Partnership's conflicts policy. At June 30, 2018 , a fund controlled by Quintana Capital owned a substantial interest in Corsa Coal Corp. ("Corsa"), a coal mining company traded on the TSX Venture Exchange that was of the Partnership’s lessees in Tennessee. During the three months ended June 30, 2018 , Corsa assigned its lease with NRP to a third party and is no longer deemed a related party.

Coal related revenues from Corsa totaled $0.2 million and $0.4 million for the three months ended June 30, 2018 and 2017 , respectively. Coal related revenues from Corsa totaled $0.4 million and $0.7 million for the six months ended June 30, 2018 and 2017 , respectively. At June 30, 2018 and December 31, 2017 , the Partnership had Accounts receivable—affiliates totaling $0.1 million and $0.2 million from Corsa on its Consolidated Balance Sheets, respectively.

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

Quinwood Coal Company Royalty

In May 2017, a subsidiary of Alpha Natural Resources assigned two coal leases with us to Quinwood Coal Company ("Quinwood"), and entity wholly-owned by Corbin J. Robertson III. In connection with this lease assignment, Quinwood forfeited the historical recoupable balance related to this property. As a result, NRP recognized $0.9 million of deferred minimum payments received in prior periods from a subsidiary of Alpha as Coal royalty and other—affiliates revenue on its Consolidated Statements of Comprehensive Income during the three and six months ended June 30, 2017, respectively.

14. Major Customers

Revenues from customers that exceeded 10 percent of total revenues and other income for any of the periods presented below are as follows:



	Three Months Ended June 30,								Six Months Ended June 30,
	2018				2017				2018				2017
(In thousands)	Revenues		Percent		Revenues		Percent		Revenues		Percent		Revenues		Percent
Foresight Energy	$	12,990	11.7	%	$	16,255	17.1	%	$	25,421	12.7	%	$	32,046	17.5	%

Revenues from Foresight Energy are included within the Partnership's Coal Royalty and Other segment.

15. Commitments and Contingencies

Legal

NRP is involved, from time to time, in various legal proceedings arising in the ordinary course of business. While the ultimate results of these proceedings cannot be predicted with certainty, Partnership management believes these claims will not have a material effect on the Partnership’s financial position, liquidity or operations. NRP is also currently involved in the legal proceedings described below.

Anadarko Contingent Consideration Payment Dispute

In January 2013, NRP acquired a non-controlling 48.51% general partner interest in OCI Wyoming, L.P. ("OCI LP") and all of the preferred stock and a portion of the common stock of OCI Wyoming Co. ("OCI Co") (which in turn owned a 1% limited partner interest in OCI LP) from Anadarko Holding Company and its subsidiary, Big Island Trona Company (together, "Anadarko"). The remaining general partner interest in OCI LP and common stock of OCI Co were owned by subsidiaries of OCI Chemical Corporation. The acquisition agreement provided for additional contingent consideration of up to $50 million to be paid by NRP if certain performance criteria were met at OCI LP as defined in the purchase and sale agreement in any of the years 2013, 2014 or 2015. For those years, NRP paid an aggregate of $11.5 million to Anadarko in full satisfaction of these contingent consideration payment obligations.

In July 2013, pursuant to a series of transactions in connection with an initial public offering by a subsidiary of OCI Chemical Corporation, the ownership structure in OCI LP was simplified. In connection with such reorganization, NRP exchanged the stock of OCI Co for a limited partner interest in OCI LP. Following the reorganization, NRP's interest in OCI LP increased to 49% , consisting of both limited and general partner interests. The restructuring did not have any impact on the operations, revenues, management or control of OCI LP.

In July 2017, Anadarko filed a lawsuit against Opco and NRP Trona LLC alleging that the transactions conducted in 2013 triggered an acceleration of NRP's obligation under the purchase agreement with Anadarko to pay additional contingent consideration in full and demanded immediate payment of such amount, together with interest, court costs and attorneys’ fees. NRP does not believe the reorganization transactions triggered an obligation to pay any additional contingent consideration, and is vigorously defending this lawsuit. However, the ultimate outcome cannot be predicted with certainty given the early stage of this matter, and the Partnership estimates a possible range of loss between $0 , if it prevails, and approximately $40 million plus interest, court costs and attorneys’ fees if Anadarko prevails and is awarded the full damages it seeks.

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

Foresight Energy Disputes

In November 2015, NRP filed a lawsuit against Hillsboro and has subsequently named Foresight Energy and certain of its other subsidiaries in that lawsuit. The lawsuit alleges, among other items, breach of contract by Hillsboro resulting from a wrongful declaration of force majeure at Hillsboro’s Deer Run mine, as well as alter-ego and tortious interference claims against Foresight Energy. In late March 2015, elevated carbon monoxide readings were detected at the Deer Run mine, and coal production at the mine was idled. In July 2015, Hillsboro declared a force majeure event under its lease with us, and Hillsboro has failed to make its contractually obligated minimum quarterly payments of $7.5 million since then. NRP believes the force majeure declaration by Hillsboro has no merit and is vigorously pursuing recovery against Hillsboro as well as against Foresight Energy and certain of its other subsidiaries. Hillsboro has made a counterclaim seeking a declaration that the lease terminated retroactively effective March 26, 2015. We believe there is no basis for termination of the lease, as substantial merchantable and mineable coal reserves remain at the Deer Run mine, and the lease will remain in full force and effect unless the Court ultimately declares the lease terminated. Hillsboro has failed to make $91.0 million of required quarterly minimum payments to NRP to date, and such amount will continue to increase by $7.5 million for each quarter with respect to which payment is not made. Additionally, approximately $15 million of interest on the unpaid amounts has accrued through July 31, 2018. A bench trial is currently set for October 22, 2018.

In April 2016, NRP filed a lawsuit against Macoupin Energy, LLC ("Macoupin"), a subsidiary of Foresight Energy, in Macoupin County, Illinois. The lawsuit alleges that Macoupin has failed to comply with the terms of its coal mining, rail loadout and rail loop leases by incorrectly recouping previously paid minimum royalties. As a result, Macoupin owes NRP approximately $10.1 million in improperly recouped minimum royalties through June 30, 2018 .

16. Unit-Based Compensation

2017 Long-Term Incentive Plan

In December 2017, the 2017 Long-Term Incentive Plan (the “2017 LTIP”) was approved and it became effective in January 2018. The 2017 LTIP authorizes 800,000 common units that are available for delivery by the Partnership pursuant to awards under the plan. The term is 10 years from the date of Board approval or, if earlier, the date the 2017 LTIP is terminated by the Board or the committee appointed by the Board to administer the 2017 LTIP, or the date all available common units available have been delivered. Common units delivered pursuant to the 2017 LTIP will consist, in whole or part, of (i) common units acquired in the open market, (ii) common units acquired from the Partnership (including newly issued units), any of our affiliates or any other person or (iii) any combination of the foregoing.

Employees, consultants and non-employee directors of the Partnership, the General Partner, GP LLC and their affiliates are generally eligible to receive awards under the 2017 LTIP. The 2017 LTIP provides for the issuance of a variety of equity-based grants, including grants of (i) options, (ii) unit appreciation rights, (iii) restricted units, (iv) phantom units, (v) cash awards, (vi) performance awards, (vii) distribution equivalent rights, and (viii) other unit-based awards. The plan is administered by the Compensation, Nominating and Governance Committee of the Board, which will determine the terms and conditions of awards granted under the 2017 LTIP. The Partnership recognizes forfeitures for any awards issued under this plan as they occur.

In connection with the phantom unit awards, the Compensation, Nominating and Governance Committee also granted tandem Distribution Equivalent Rights ("DERs"), which entitle the holders to receive distributions equal to the distributions paid on the Partnership’s common units between the date the units are granted and the vesting date. The DERs are payable in cash upon vesting but may be subject to forfeiture if the grantee ceases employment prior to vesting.

NATURAL RESOURCE PARTNERS L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED

(Unaudited)

Unit-Based Awards

Unit-based awards under the 2017 LTIP are generally issued to certain employees and non-employee directors of the Partnership. Awards granted to employees vest at the end of a three year period and awards granted to non-employee directors are immediately vested. Directors are given the option to take immediate issuance of the vested awards or defer such issuance until a later date. Upon deferral of issuance, such units will continue to accumulate DERs until issuance.

A summary of the activity during six months ended June 30, 2018 is as follows:



(In thousands)	Common Units		Weighted Average Exercise Price
Outstanding at January 1, 2018	—		$	—
Granted	75		$	29.16
Fully vested and issued	(14	)	$	29.44
Forfeitures	—		$	—
Outstanding at June 30, 2018	61		$	29.10

The awards granted in the first quarter of 2018 were valued using the closing price of NRP's units as of the grant date. The grant date fair value of the 2017 LTIP awards granted during the period was $2.2 million , including awards granted to board members with a grant date fair value of $0.6 million which immediately vested and of which $0.4 million were issued. Total unit-based compensation expense associated with these awards was $0.2 million for the three months ended June 30, 2018 and $0.8 million for the six months ended June 30, 2018 and is included in General and administrative expense and Operating and maintenance expense in the Partnership's Consolidated Statements of Comprehensive Income. The unamortized cost associated with unvested outstanding awards as of June 30, 2018 is $1.4 million , which is to be recognized over a weighted-average period of 2.6 years .

17. Subsequent Events

The following represents material events that have occurred subsequent to June 30, 2018 through the time of the Partnership’s filing of its Quarterly Report on Form 10-Q with the SEC:

Distributions Declared

On July 26, 2018, the Board of Directors of GP Natural Resource Partners LLC declared a distribution of $0.45 per common unit to be paid by the Partnership on August 14, 2018 to common unitholders of record on August 7, 2018. In addition, the Board declared a distribution on NRP's 12.0% Class A Convertible Preferred Units with respect to the second quarter totaling $7.5 million in cash.

ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following review of operations for the three and six month periods ended June 30, 2018 and 2017 should be read in conjunction with our Consolidated Financial Statements and the Notes included in this Form 10-Q and with the Consolidated Financial Statements, Notes and Management’s Discussion and Analysis included in the Natural Resource Partners LP Annual Report on Form 10-K for the year ended December 31, 2017 .

As used herein, unless the context otherwise requires: "we," "our," "us" and the "Partnership" refer to Natural Resource Partners L.P. and, where the context requires, our subsidiaries. References to "NRP" and "Natural Resource Partners" refer to Natural Resource Partners L.P. only, and not to NRP (Operating) LLC or any of Natural Resource Partners L.P.’s subsidiaries. References to "Opco" refer to NRP (Operating) LLC, a wholly owned subsidiary of NRP, and its subsidiaries. NRP Finance Corporation ("NRP Finance") is a wholly owned subsidiary of NRP and a co-issuer with NRP on the 2022 senior notes.

INFORMATION REGARDING FORWARD-LOOKING STATEMENTS

Statements included in this 10-Q may constitute forward-looking statements. In addition, we and our representatives may from time to time make other oral or written statements which are also forward-looking statements. Such forward-looking statements include, among other things, statements regarding: our business strategy; our liquidity and access to capital and financing sources; our financial strategy; prices of and demand for coal, trona and soda ash, construction aggregates and other natural resources; estimated revenues, expenses and results of operations; the amount, nature and timing of capital expenditures; projected production levels by our lessees and our construction aggregates business; Ciner Wyoming LLC’s ("Ciner Wyoming's") trona mining and soda ash refinery operations; the impact of governmental policies, laws and regulations, as well as regulatory and legal proceedings involving us, and of scheduled or potential regulatory or legal changes; and global and U.S. economic conditions.

These forward-looking statements speak only as of the date hereof and are made based upon our current plans, expectations, estimates, assumptions and beliefs concerning future events impacting us and involve a number of risks and uncertainties. We caution that forward-looking statements are not guarantees and that actual results could differ materially from those expressed or implied in the forward-looking statements. You should not put undue reliance on any forward-looking statements. See "Item 1A. Risk Factors" in our Annual Report on Form 10-K for the year ended December 31, 2017 for important factors that could cause our actual results of operations or our actual financial condition to differ.

NON-GAAP FINANCIAL MEASURES

Adjusted EBITDA (Non-GAAP Financial Measure)

Adjusted EBITDA is a non-GAAP financial measure that we define as net income (loss) from continuing operations less equity earnings from unconsolidated investment and net income attributable to non-controlling interest; plus total distributions from unconsolidated investment, interest expense, net, debt modification expense, loss on extinguishment of debt, depreciation, depletion and amortization and asset impairments.

Adjusted EBITDA should not be considered an alternative to, or more meaningful than, net income or loss, net income or loss attributable to partners, operating income, cash flows from operating activities or any other measure of financial performance presented in accordance with GAAP as measures of operating performance, liquidity or ability to service debt obligations. There are significant limitations to using Adjusted EBITDA as a measure of performance, including the inability to analyze the effect of certain recurring items that materially affect our net income (loss), the lack of comparability of results of operations of different companies and the different methods of calculating Adjusted EBITDA reported by different companies. In addition, Adjusted EBITDA presented below is not calculated or presented on the same basis as Consolidated EBITDA as defined in our partnership agreement or Consolidated EBITDDA as defined in Opco's debt agreements. See Note 11. Debt for a description of Opco’s debt agreements.

Adjusted EBITDA is a supplemental performance measure used by our management and by external users of our financial statements, such as investors, commercial banks, research analysts and others to assess the financial performance of our assets without regard to financing methods, capital structure or historical cost basis.

Distributable Cash Flow (Non-GAAP Financial Measure)

Our Distributable cash flow ("DCF") represents net cash provided by operating activities of continuing operations plus distributions from unconsolidated investment in excess of cumulative earnings, proceeds from sales of assets, including those included in discontinued operations, and return of long-term contract receivables (including affiliate); less maintenance capital expenditures and distributions to non-controlling interest. DCF is not a measure of financial performance under GAAP and should not be considered as an alternative to cash flows from operating, investing or financing activities. DCF may not be calculated the same for us as for other companies. In addition, DCF presented below is not calculated or presented on the same basis as Distributable cash flow as defined in our partnership agreement, which is used as a metric to determine whether we are able to increase quarterly distributions to our common unitholders. DCF is a supplemental liquidity measure used by our management and by external users of our financial statements, such as investors, commercial banks, research analysts and others to assess our ability to make cash distributions to our common and preferred unitholders and our general partner and repay debt.

Free Cash Flow (Non-GAAP Financial Measure)

Our Free cash flow ("FCF") represents net cash provided by operating activities of continuing operations plus distributions from unconsolidated investment in excess of cumulative earnings and return of long-term contract receivables (including affiliate); less maintenance and expansion capital expenditures, cash flow used in mitigation payments and acquisition costs classified as financing activities and distributions to non-controlling interest. FCF is calculated before mandatory debt repayments. FCF is not a measure of financial performance under GAAP and should not be considered as an alternative to cash flows from operating, investing or financing activities. FCF may not be calculated the same for us as for other companies. FCF is a supplemental liquidity measure used by our management and by external users of our financial statements, such as investors, commercial banks, research analysts and others to assess the Partnership's ability to make cash distributions to our common and preferred unitholders and our general partner and repay debt.

Introduction

The following discussion and analysis presents management's view of our business, financial condition and overall performance. Our discussion and analysis consists of the following subjects:

• Executive Overview

• Results of Operations

• Liquidity and Capital Resources

• Off-Balance Sheet Transactions

• Related Party Transactions

• Summary of Critical Accounting Estimates

• Recent Accounting Standards

Executive Overview

We are a diversified natural resource company engaged principally in the business of owning, operating, managing and leasing a portfolio of mineral properties in the United States, including interests in coal, soda ash from trona and other natural resources and operating a construction aggregates business. Our common units trade on the New York Stock Exchange under the symbol "NRP".

Our business is organized into three operating segments:

Coal Royalty and Other —consists primarily of coal royalty properties and coal-related transportation and processing assets. Other assets include aggregates, industrial mineral and oil and gas royalty properties and timber. Our coal reserves are primarily located in Appalachia, the Illinois Basin and in the western United States. Our aggregates and industrial minerals are primarily located in a number of states across the United States. Our oil and gas royalty assets are primarily located in Louisiana and Pennsylvania.

Soda Ash —consists of our 49% non-controlling equity interest in Ciner Wyoming, a trona ore mining operation and soda ash refinery, in the Green River Basin of Wyoming. Ciner Resources LP, our operating partner, mines the trona, processes it into soda ash and distributes the soda ash both domestically and internationally to the glass and chemicals industries. We receive regular quarterly distributions from Ciner Wyoming.

Construction Aggregates —consists of our construction aggregates materials business that operates hard rock quarries, an underground limestone mine, sand and gravel plants, asphalt plants and marine terminals. The construction aggregates business operates in Pennsylvania, West Virginia, Tennessee, Kentucky and Louisiana.

Our 2018 year-to-date financial results by segment for the six months ended June 30, 2018 are as follows:



	Operating Segments
(In thousands)	Coal Royalty and Other		Soda Ash		Construction Aggregates			Corporate and Financing			Total
Revenues and other income	$	106,313	$	26,150	$	67,612		$	—		$	200,075
Net income (loss) from continuing operations	$	81,378	$	26,150	$	966		$	(43,283	)	$	65,211
Adjusted EBITDA ⁽¹⁾	$	91,227	$	24,500	$	7,030		$	(7,599	)	$	115,158

Operating cash flow from continuing operations	$	90,518	$	22,403	$	3,283		$	(41,614	)	$	74,590
Investing cash flow from continuing operations	$	1,842	$	2,097	$	(5,772	)	$	—		$	(1,833	)
Financing cash flow from continuing operations	$	—	$	—	$	(515	)	$	(49,094	)	$	(49,609	)
Distributable cash flow ⁽¹⁾	$	92,360	$	24,500	$	(1,560	)	$	(41,614	)	$	73,686
Free cash flow ⁽¹⁾	$	91,534	$	24,500	$	(3,089	)	$	(41,614	)	$	71,331


(1)	See "Results of Operations" below for reconciliations to the most comparable GAAP financial measures.

Corporate and Financing includes functional corporate departments that do not earn revenues, such as interest and financing, corporate headquarters and overhead, centralized treasury and accounting and other corporate-level activity not specifically allocated to a segment.

Current Results/Market Commentary

Coal Royalty and Other Business Segment

Results in the first six months of 2018 were driven by consistent strength in both metallurgical and thermal coal markets. Metallurgical coal prices were approximately 20% higher during the first half of 2018 as compared to the first half of 2017 and approximately 7% higher over the last half of 2017, driven by continued supply constraints and worldwide steel production growth. Increased steel demand combined with a reduction in Chinese steel exports has led to higher steel prices and steel producer profit margins internationally, which supports higher prices for raw material inputs such as metallurgical coal and coke. Benefiting from higher metallurgical coal prices, we derived approximately 67% of our coal royalty revenues and approximately 54% of our coal royalty production from metallurgical coal during the six months ended June 30, 2018 . For the remainder of 2018, we are monitoring ongoing trade and tariff negotiations in order to assess the associated risk to continued global economic growth. We currently expect metallurgical coal markets to remain stable due to supportive steel industry fundamentals combined with logistical and operational supply constraints across the industry.

Thermal coal export markets remain strong as a result of increased export demand from Asia and northern Europe. In addition, domestic thermal coal burn has increased as a result of warm weather conditions in the US, resulting in reduced utility coal stock piles. Longer term, we expect coal’s relative share of the electricity generation mix to decline due to low natural gas prices, continued coal fired power plant retirements and the availability of renewable generation.

Soda Ash Business Segment

Ciner Wyoming's results are primarily affected by the global supply of and demand for soda ash, which in turn directly impacts the prices Ciner Wyoming and other producers charge for its products. Demand for soda ash in the United States is driven in a large part by economic growth and activity levels in the end markets that the glass-making industry serve, such as the automotive and construction industries. Because the United States is a well-developed market for soda ash, we expect that domestic demand levels will remain stable for the near future. Because future United States capacity growth is expected to come from the four major producers in the Green River Basin, we also expect that U.S. supply levels will remain relatively stable in the near term.

Soda ash demand in international markets has continued to grow in conjunction with GDP. We expect that future global economic growth will positively influence global demand, which will likely result in increased exports, primarily from the United States, Turkey and to a limited extent, from China, the largest suppliers of soda ash to international markets. However, in the near term, new supply coming on-line, primarily in Turkey, may exceed any new growth in demand and could have an impact on international pricing.

Ciner Wyoming expects to grow its domestic market share in the near future while also remaining focused on international markets.

While soda ash demand and Ciner Wyoming's sales prices remained stable during the first six months of 2018, production and sales volumes were lower than prior year due to unexpected repairs during a scheduled outage. These repairs were successfully completed and operations resumed prior to the end of the quarter. Ciner Wyoming's results during the first half of 2018 also included the litigation settlement of a royalty dispute that resulted in $12.7 million of income.

Construction Aggregates Business Segment

Our construction aggregates business is largely dependent on the strength of the local markets that it serves. In particular, key drivers of performance in the regions of our operations include: 1) natural gas drilling customers in the Marcellus shale, 2) traditional construction markets of Southwest Pennsylvania and Northern West Virginia, 3) energy-related and infrastructure spending in the Louisiana market, and 4) military spending in the Clarksville, Tennessee market. The business is also seasonal, with lower production and sales during the first quarter each year.

Overall operating results in the first six months of 2018 were consistent with prior year as additional revenue from increased construction project and energy sector activity was offset by higher operating costs. While revenues increased $6.6 million , or 11% over prior year as a result of higher sales volumes and prices from the additional construction project and energy sector activity, operating and maintenance costs increased $7.8 million , or 15% over the prior year primarily due to the increased production volume. Additionally, our Adjusted EBITDA margin declined from 13% to 10% due to higher diesel prices and the accelerated timing of certain repair and maintenance costs.

Results of Operations

Second Quarter of 2018 and 2017 Compared

Revenues and Other Income

The following table includes our revenues and other income by business segment for the three months ended June 30, 2018 and 2017 :



	For the Three Months Ended June 30,				Increase (Decrease)		Percentage Change
Business Segment (In thousands)	2018		2017		Increase (Decrease)		Percentage Change
Coal Royalty and Other	$	54,069	$	52,810	$	1,259	2	%
Soda Ash	16,529		8,389		8,140		97	%
Construction Aggregates	40,451		33,732		6,719		20	%
Total	$	111,049	$	94,931	$	16,118	17	%

The changes in revenue and other income is discussed for each of our business segments below:

Coal Royalty and Other

The table below presents coal production, coal royalty revenue per ton and coal royalty revenues (including affiliates) by major coal producing region and the significant categories of other revenues:



	Three Months Ended June 30,					Increase (Decrease)			Percentage Change
(In thousands, except percent and per ton data)	2018			2017		Increase (Decrease)			Percentage Change
Coal production (tons)
Appalachia
Northern	916			247		669			271	%
Central	4,163			3,897		266			7	%
Southern	396			690		(294		)	(43	)%
Total Appalachia	5,475			4,834		641			13	%
Illinois Basin	739			734		5			1	%
Northern Powder River Basin	808			910		(102		)	(11	)%
Total coal production	7,022			6,478		544			8	%

Coal royalty revenue per ton
Appalachia
Northern	$	3.52		$	3.78	$	(0.26	)	(7	)%
Central	5.65			5.05		0.60			12	%
Southern	6.85			5.69		1.16			20	%
Illinois Basin	4.72			4.06		0.66			16	%
Northern Powder River Basin	2.25			2.62		(0.37		)	(14	)%
Combined average coal royalty revenue per ton	4.95			4.62		0.33			7	%

Coal royalty revenues
Appalachia
Northern	$	3,230		$	933	$	2,297		246	%
Central	23,520			19,691		3,829			19	%
Southern	2,712			3,927		(1,215		)	(31	)%
Total Appalachia	29,462			24,551		4,911			20	%
Illinois Basin	3,485			2,978		507			17	%
Northern Powder River Basin	1,815			2,384		(569		)	(24	)%
Unadjusted coal royalty revenue	34,762			29,913		4,849			16	%
Coal royalty adjustment for minimum leases ^{(1) (2)}	(3,355		)	—		(3,355		)	(100	)%
Total coal royalty revenue	$	31,407		$	29,913	$	1,494		5	%

Other revenues						—
Production lease minimum revenue ^{(1) (3)}	$	102		$	7,547	$	(7,445	)	(99	)%
Minimum lease straight-line revenue ^{(1) (2)}	6,769			—		6,769			100	%
Property tax revenue	1,523			1,100		423			38	%
Wheelage revenue	1,641			1,025		616			60	%
Coal overriding royalty revenue	3,702			1,885		1,817			96	%
Aggregates royalty revenues	1,572			1,452		120			8	%
Oil and gas royalty revenues	1,354			924		430			47	%
Other	829			260		569			219	%
Total other revenues	17,492			14,193		3,299			23	%
Coal royalty and other	48,899			44,106		4,793			11	%
Transportation and processing services	5,002			5,520		(518		)	(9	)%
Gain on asset sales, net	168			3,184		(3,016		)	(95	)%
Total coal royalty and other segment revenues and other income	$	54,069		$	52,810	$	1,259		2	%

(1)

These line items were impacted by the adoption of the new revenue recognition standard effective January 1, 2018. The total impact of the adoption of this standard in the three months ended June 30, 2018 was a net decrease of $2.0 million in coal royalty and other income. Refer to Note 1. Basis of Presentation for the overall impact of the adoption of the new revenue recognition standard on our consolidated financial statements and Note 2. Revenue Recognition for further discussion on changes in our revenue recognition policies as a result of this adoption.


(2)	Coal royalty adjustment for minimum leases of $(3.4) million represents coal royalty revenues from production that do not exceed minimum lease straight line revenue. This amount was offset by $6.8 million of minimum lease straight-line revenue.


(3)	Production lease minimum revenue decreased by $5.4 million as a result of the new revenue recognition standard. The remaining decrease is due to greater expiration of minimums in the prior year period.

Coal Royalty Revenue

Coal royalty revenues increased $1.5 million , or 5% , from $29.9 million in the three months ended June 30, 2017 to $31.4 million in the three months ended June 30, 2018 primarily driven by increased metallurgical coal prices and production in the second quarter of 2018 as compared to the second quarter of 2017.

Other Revenues

Total other revenues increased $3.3 million in the three months ended June 30, 2018 compared to the three months ended June 30, 2017 as a result of higher overriding royalty revenue and wheelage from the production of non-NRP coal due to the temporary relocation of certain production off of NRP's coal reserves in the Illinois Basin.

Gain on Asset Sales, Net

Gain on asset sales, net for the segment decreased $3.0 million , or 95% , in the three months ended June 30, 2018 compared to the three months ended June 30, 2017 . Gain on asset sales, net during the three months ended June 30, 2017 related to sales of aggregates royalty properties. There were no material asset sales during the three months ended June 30, 2018 .

Soda Ash

Revenues and other income related to our Soda Ash segment increased $8.1 million , or 97% , from $8.4 million in the three months ended June 30, 2017 to $16.5 million in the three months ended June 30, 2018 . This increase was primarily as a result of Ciner Wyoming's litigation settlement of a royalty dispute that resulted in $12.7 million of income, partially offset by a $4.6 million decrease primarily due to unexpected repairs during a scheduled outage in May 2018 that resulted in lower production and sales. This repair was successfully completed and operations resumed prior to the end of the quarter.

Construction Aggregates

The table below presents major sources of Construction Aggregates revenues:



	For the Three Months Ended June 30,				Increase (Decrease)			Percentage Change
(In thousands)	2018		2017		Increase (Decrease)			Percentage Change
Crushed stone, sand and gravel	$	18,070	$	14,149	$	3,921		28	%
Delivery and fuel income	11,678		9,141		2,537			28	%
Other	4,485		4,073		412			10	%
Total construction aggregates revenues	$	34,233	$	27,363	$	6,870		25	%
Road construction and asphalt paving services	6,176		6,192		(16		)	—	%
Gain on asset sales, net	42		177		(135		)	(76	)%
Total construction aggregates revenues and other income	$	40,451	$	33,732	$	6,719		20	%

Total construction aggregates revenues and other income increased $6.7 million , or 20% , from $33.7 million in the three months ended June 30, 2017 to $40.5 million in the three months ended June 30, 2018 . This increase is primarily due to higher production and sales of crushed stone, gravel and sand compared to the prior year period as a result of an increase in construction projects and increased activity in the energy sector. However, overall Construction Aggregates segment operating results in the three months ended June 30, 2018 were consistent with the prior year period as increased construction project and energy sector activity in the markets we serve were offset by higher operating costs. As further described below, operating and maintenance costs increased $6.4 million compared to the prior year period primarily due to the increased production volume and our Adjusted EBITDA margins declined from 17% to 15% due to higher diesel prices and the accelerated timing of certain and repair and maintenance costs.

Operating and Other Expenses

The table below presents the significant categories of our consolidated operating and other expenses:



	For the Three Months Ended June 30,						Increase (Decrease)		Percentage Change
(In thousands)	2018			2017			Increase (Decrease)		Percentage Change
Operating expenses
Operating and maintenance expenses (including affiliates)	$	42,366		$	33,239		$	9,127	27	%
Depreciation, depletion and amortization (including affiliates)	8,563			8,405			158		2	%
General and administrative (including affiliates)	3,263			2,883			380		13	%
Total operating expenses	$	54,192		$	44,527		$	9,665	22	%

Interest expense, net	$	(17,734	)	$	(20,308	)	$	2,574	13	%
Debt modification expense	—			(132		)	132		100	%
Loss on extinguishment of debt	—			(4,107		)	4,107		100	%
Other expense, net	$	(17,734	)	$	(24,547	)	$	6,813	28	%

Total operating expenses increased $9.7 million , or 22% , from $44.5 million in the three months ended June 30, 2017 to $54.2 million in the three months ended June 30, 2018 . This increase is primarily related to the following:


•	Operating and maintenance expenses (including affiliate) increased $9.1 million , or 27% quarter-over-quarter and include the costs to operate our Construction Aggregates business and costs to manage our Coal Royalty and Other segment.

◦

Construction Aggregates segment operating and maintenance expenses primarily consist of delivery and fuel, production costs, repair and maintenance, labor costs and utilities. Operating and maintenance costs for this segment increased $6.4 million , or 23% , from $27.8 million in the three months ended June 30, 2017 to $34.2 million in the three months ended June 30, 2018 primarily as a result of higher delivery fees and production costs from the increased production activity, higher repair and maintenance expense due to timing and higher fuel costs as a result of increased diesel prices.

◦

Coal Royalty and Other segment operating and maintenance expenses primarily consist of property taxes, legal, royalty and employee related costs. Operating and maintenance costs for this segment increased $2.7 million , or 50% , from $5.4 million in the three months ended June 30, 2017 to $8.1 million in the three months ended June 30, 2018 primarily as a result of increased overriding royalty interest fees.

Total other expenses decreased $6.8 million , or 28% , from $24.5 million in the three months ended June 30, 2017 to $17.7 million in the three months ended June 30, 2018 . This decrease is primarily related to the following:


•	Interest expense, net decreased primarily due to lower principal balances during the second quarter of 2018 as a result of progress made to repay debt.


•	Loss on extinguishment of debt in the three months ended June 30, 2017 resulted from the 4.563% premium paid to redeem the 2018 Senior Notes in April 2017.

Adjusted EBITDA (Non-GAAP Financial Measure)

The following table reconciles net income (loss) from continuing operations (the most comparable GAAP financial measure) to Adjusted EBITDA by business segment for the three months ended June 30, 2018 and 2017 :



	Operating Segments
For the Three Months Ended (in thousands)	Coal Royalty and Other			Soda Ash			Construction Aggregates		Corporate and Financing			Total
June 30, 2018
Net income (loss) from continuing operations	$	40,650		$	16,529		$	2,941	$	(20,997	)	$	39,123
Less: equity earnings from unconsolidated investment	—			(16,529		)	—		—			(16,529		)
Less: net income attributable to non-controlling interest	(869		)	—			—		—			(869		)
Add: total distributions from unconsolidated investment	—			12,250			—		—			12,250
Add: interest expense, net	—			—			—		17,734			17,734
Add: depreciation, depletion and amortization	5,376			—			3,187		—			8,563
Adjusted EBITDA	$	45,157		$	12,250		$	6,128	$	(3,263	)	$	60,272

June 30, 2017
Net income (loss) from continuing operations	$	42,084		$	8,389		$	2,636	$	(27,252	)	$	25,857
Less: equity earnings from unconsolidated investment	—			(8,389		)	—		—			(8,389		)
Add: total distributions from unconsolidated investment	—			12,250			—		—			12,250
Add: interest expense, net	—			—			178		20,130			20,308
Add: debt modification expense	—			—			—		132			132
Add: loss on extinguishment of debt	—			—			—		4,107			4,107
Add: depreciation, depletion and amortization	5,375			—			3,030		—			8,405
Adjusted EBITDA	$	47,459		$	12,250		$	5,844	$	(2,883	)	$	62,670

Adjusted EBITDA decreased $2.4 million in the three months ended June 30, 2018 compared to the three months ended June 30, 2017 primarily as a result of the following:


•	Coal Royalty and Other segment Adjusted EBITDA decreased $2.3 million primarily as a result of the $3.2 million gain on asset sales recognized in the second quarter of 2017.


•	Construction Aggregates segment Adjusted EBITDA increased $0.3 million as a result of higher production and sales of crushed stone, gravel and sand, partially offset by an increase in operating expenses as discussed above.


•	Corporate and Financing Adjusted EBITDA decreased $0.4 million as a result of the increase in G&A expenses as discussed above.

Distributable Cash Flow and Free Cash Flow (Non-GAAP Financial Measures)

The following table presents the three major categories of the statement of cash flows by business segment:



	Operating Segments
For the Three Months Ended (in thousands)	Coal Royalty and Other		Soda Ash		Construction Aggregates			Corporate and Financing			Total
June 30, 2018
Net cash provided by (used in) operating activities of continuing operations	$	51,725	$	12,250	$	486		$	(10,082	)	$	54,379
Net cash provided by (used in) investing activities of continuing operations	699		—		(2,359		)	—			$	(1,660	)
Net cash used in financing activities of continuing operations	—		—		(466		)	(20,430		)	$	(20,896	)

June 30, 2017
Net cash provided by (used in) operating activities of continuing operations	$	38,537	$	9,862	$	5,476		$	(18,770	)	$	35,105
Net cash provided by (used in) investing activities of continuing operations	2,888		2,388		(2,539		)	—			2,737
Net cash provided by (used in) financing activities of continuing operations	17		—		(1,000		)	(109,021		)	(110,004		)

The following table reconciles net cash provided by operating activities (the most comparable GAAP financial measure) by business segment to Distributable cash flow ("DCF") and Free cash flow ("FCF") for the three months ended June 30, 2018 and 2017 :



	Operating Segments
For the Three Months Ended (in thousands)	Coal Royalty and Other			Soda Ash		Construction Aggregates			Corporate and Financing			Total
June 30, 2018
Net cash provided by (used in) operating activities of continuing operations	$	51,725		$	12,250	$	486		$	(10,082	)	$	54,379
Add: proceeds from sale of assets	170			—		54			—			224
Add: return on long-term contract receivables	529			—		—			—			529
Less: maintenance capital expenditures	—			—		(2,291		)	—			(2,291		)
Distributable cash flow	$	52,424		$	12,250	$	(1,751	)	$	(10,082	)	$	52,841
Less: proceeds from the sale of assets	(170		)	—		(54		)	—			(224		)
Less: expansion capital expenditures	—			—		(122		)	—			(122		)
Less: mitigation payments and acquisition costs classified as financing activities	—			—		(466		)	—			(466		)
Free cash flow	$	52,254		$	12,250	$	(2,393	)	$	(10,082	)	$	52,029

June 30, 2017
Net cash provided by (used in) operating activities of continuing operations	$	38,537		$	9,862	$	5,476		$	(18,770	)	$	35,105
Add: distributions from unconsolidated investment in excess of cumulative earnings	—			2,388		—			—			2,388
Add: proceeds from sale of assets	1,292			—		363			—			1,655
Add: return on long-term contract receivables (including affiliates)	1,597			—		—			—			1,597
Less: maintenance capital expenditures	—			—		(2,415		)	—			(2,415		)
Distributable cash flow	$	41,426		$	12,250	$	3,424		$	(18,770	)	$	38,330
Less: proceeds from the sale of assets	(1,292		)	—		(363		)	—			(1,655		)
Less: expansion capital expenditures	—			—		(488		)	—			(488		)
Less: mitigation payments and acquisition costs classified as financing activities	—			—		(1,000		)	—			(1,000		)
Free cash flow	$	40,134		$	12,250	$	1,573		$	(18,770	)	$	35,187

DCF and FCF increased $14.5 million and $16.8 million , respectively, in the three months ended June 30, 2018 as compared to the three months ended June 30, 2017 . This increase is due primarily to the following:


•	Coal Royalty and Other segment DCF increased $11.0 million and FCF increased $12.1 million as a result of the timing of cash receipts from both coal royalty production and minimums and property tax reimbursements.


•	Construction Aggregates segment DCF decreased $5.2 million and FCF decreased $4.0 million primarily due to the timing of certain operating payments.


•	Corporate and Financing DCF and FCF increased $8.7 million primarily as a result of interest payments made in 2017 on NRP's 9.125% Senior Notes that were fully repaid in the fourth quarter of 2017.

Results of Operations

First Six Months of 2018 and 2017 Compared

Revenues and Other Income

The following table shows our revenues and other income by business segment for the six months ended June 30, 2018 and 2017 :



	For the Six Months Ended June 30,				Increase (Decrease)		Percentage Change
Business Segment (In thousands)	2018		2017		Increase (Decrease)		Percentage Change
Coal Royalty and Other	$	106,313	$	103,977	$	2,336	2	%
Soda Ash	26,150		18,683		7,467		40	%
Construction Aggregates	67,612		60,968		6,644		11	%
Total	$	200,075	$	183,628	$	16,447	9	%

The changes in revenues and other income for each business segment are discussed below:

Coal Royalty and Other

The table below presents coal production, coal royalty revenue per ton and coal royalty revenues (including affiliates) derived from our major coal producing regions and the significant categories of other revenues:



	For the Six Months Ended June 30,					Increase (Decrease)			Percentage Change
(In thousands, except per ton data)	2018			2017		Increase (Decrease)			Percentage Change
Coal production (tons)
Appalachia
Northern	1,141			1,454		(313		)	(22	)%
Central	7,709			7,597		112			1	%
Southern	942			1,253		(311		)	(25	)%
Total Appalachia	9,792			10,304		(512		)	(5	)%
Illinois Basin	1,482			2,751		(1,269		)	(46	)%
Northern Powder River Basin	2,041			1,859		182			10	%
Total coal production	13,315			14,914		(1,599		)	(11	)%

Coal royalty revenue per ton
Appalachia
Northern	$	3.76		$	1.06	$	2.70		255	%
Central	5.68			5.25		0.43			8	%
Southern	7.03			6.03		1.00			17	%
Illinois Basin	4.43			3.50		0.93			27	%
Northern Powder River Basin	2.24			2.63		(0.39		)	(15	)%
Combined average coal royalty revenue per ton	4.94			4.26		0.68			16	%

Coal royalty revenues
Appalachia
Northern	$	4,296		$	1,540	$	2,756		179	%
Central	43,752			39,875		3,877			10	%
Southern	6,626			7,559		(933		)	(12	)%
Total Appalachia	54,674			48,974		5,700			12	%
Illinois Basin	6,560			9,624		(3,064		)	(32	)%
Northern Powder River Basin	4,580			4,882		(302		)	(6	)%
Unadjusted coal royalty revenue	65,814			63,480		2,334			4	%
Coal royalty adjustment for minimum leases ^{(1) (2)}	(5,716		)	—		(5,716		)	(100	)%
Total coal royalty revenue	$	60,098		$	63,480	$	(3,382	)	(5	)%

Other revenues
Production lease minimum revenue ^{(1) (3)}	$	527		$	12,743	$	(12,216	)	(96	)%
Minimum lease straight-line revenue ^{(1) (2)}	13,529			—		13,529			100	%
Property tax revenue	2,705			3,798		(1,093		)	(29	)%
Wheelage revenue	3,615			2,292		1,323			58	%
Coal overriding royalty revenue	6,574			2,709		3,865			143	%
Aggregates royalty revenues	2,663			2,696		(33		)	(1	)%
Oil and gas royalty revenues	4,252			2,415		1,837			76	%
Other	1,146			472		674			143	%
Total other revenues	$	35,011		$	27,125	$	7,886		29	%
Coal royalty and other	95,109			90,605		4,504			5	%
Transportation and processing services	10,385			10,159		226			2	%
Gain on asset sales, net	819			3,213		(2,394		)	(75	)%
Total coal royalty and other segment revenues and other income	$	106,313		$	103,977	$	2,336		2	%

(1)

These line items were impacted by the adoption of the new revenue recognition standard in the first quarter of 2018. The total impact of the adoption of this standard in the six months ended June 30, 2018 was a net decrease of $3.7 million in coal royalty and other income. Refer to Note 1. Basis of Presentation for the overall impact on our consolidated financial statements and Note 2. Revenue Recognition for further discussion on changes in our revenue recognition policies.


(2)	Coal royalty adjustment for minimum leases of $(5.7) million represents royalty revenues from production that do not exceed minimum lease straight line revenue. This amount was offset by $13.5 million of minimum lease straight-line revenue.


(3)	Production lease minimum revenue decreased by $11.5 million as a result of the new revenue recognition standard. The remaining decrease is due to greater expiration of minimums in the prior year period.

Coal Royalty Revenue

Coal royalty revenues decreased $3.4 million , or 5% , from $63.5 million in the six months ended June 30, 2017 to $60.1 million in the six months ended June 30, 2018 primarily driven by the $5.7 million decrease in coal royalty revenue related to minimum leases as discussed above. Coal royalty revenue was also impacted by the following:


•	Appalachia: Coal royalty revenue increased $5.7 million in this region as a result of higher metallurgical and thermal coal prices and higher metallurgical coal production, partially offset by lower thermal coal production.

•

Illinois Basin: Lower production in this region led to a $3.1 million decrease in coal royalty revenue. The decreased production was primarily a result of the temporary relocation of certain production off of NRP's coal reserves. However, the decrease in coal royalty revenue was more than offset by a $4.4 million increase in overriding royalty revenue and wheelage primarily associated with the production of non-NRP coal.

Other Revenues

Total other revenues increased $7.9 million in the six months ended June 30, 2018 compared to the six months ended June 30, 2017 primarily as a result of the temporary relocation of certain production off of NRP's coal reserves in the Illinois Basin as described above, in exchange for overriding royalty revenue and wheelage from the production of non-NRP coal in addition to increased performance of our natural gas royalty properties.

Gain on Asset Sales, Net

Gain on asset sales, net for the segment decreased $2.4 million , or 75% , in the six months ended June 30, 2018 compared to the six months ended June 30, 2017 . Asset sale gains during the six months ended June 30, 2017 included sales of aggregates royalty properties and condemnation payments for a net of $3.2 million . There were no material sales during the six months ended June 30, 2018 .

Soda Ash

Revenues and other income related to our Soda Ash segment increased $7.5 million , or 40% , from $18.7 million in the six months ended June 30, 2017 to $26.2 million in the six months ended June 30, 2018 . This increase was primarily as a result of Ciner Wyoming's litigation settlement of a royalty dispute that resulted in $12.7 million of income, partially offset by a $5.2 million decrease primarily due to unexpected repairs during a scheduled outage in May 2018 that resulted in lower production and sales. This repair was successfully completed and operations resumed prior to the end of the quarter.

Construction Aggregates

The table below presents the major sources of Construction Aggregates revenues:



	For the Six Months Ended June 30,				Increase (Decrease)			Percentage Change
(In thousands)	2018		2017		Increase (Decrease)			Percentage Change
Crushed stone, sand and gravel	$	31,809	$	27,655	$	4,154		15	%
Delivery and fuel income	21,761		17,842		3,919			22	%
Other	7,087		7,349		(262		)	(4	)%
Total construction aggregates revenues	$	60,657	$	52,846	$	7,811		15	%
Road construction and asphalt paving services	6,904		7,930		(1,026		)	(13	)%
Gain on asset sales, net	51		192		(141		)	(73	)%
Total construction aggregates revenues and other income	$	67,612	$	60,968	$	6,644		11	%

Total construction aggregates revenues and other income increased $6.6 million , or 11% , from $61.0 million in the six months ended June 30, 2017 to $67.6 million in the six months ended June 30, 2018 . Crushed stone, sand and gravel revenues increased $4.2 million primarily due to increased construction project and energy sector activity. However, overall Construction Aggregates segment operating results in the first six months of 2018 were consistent with prior year as this additional revenue was offset by higher operating costs. As further described below, operating and maintenance costs increased $7.8 million compared to the prior period primarily due to the increased production volume and our Adjusted EBITDA margin declined from 13% to 10% due to higher diesel prices and the accelerated timing of certain repair and maintenance costs.

While delivery and fuel income increased $3.9 million , this revenue was fully offset by higher delivery and fuel costs. Our road construction and asphalt paving services revenue decreased $1.0 million primarily as a result of unfavorable weather during the first quarter of 2018.

Operating and Other Expenses

The table below presents the significant categories of our consolidated operating and other expenses:



	For the Six Months Ended June 30,						Increase (Decrease)			Percentage Change
(In thousands)	2018			2017			Increase (Decrease)			Percentage Change
Operating expenses
Operating and maintenance expenses (including affiliates)	$	74,799		$	65,422		$	9,377		14	%
Depreciation, depletion and amortization (including affiliates)	16,520			18,897			(2,377		)	(13	)%
General and administrative (including affiliates)	7,599			10,085			(2,486		)	(25	)%
Asset impairments	242			1,778			(1,536		)	(86	)%
Total operating expenses	$	99,160		$	96,182		$	2,978		3	%

Interest expense, net	$	(35,704	)	$	(43,432	)	$	7,728		18	%
Debt modification expense	—			(7,939		)	7,939			100	%
Loss on extinguishment of debt	—			(4,107		)	4,107			100	%
Other expense, net	$	(35,704	)	$	(55,478	)	$	19,774		36	%

Total operating expenses increased $3.0 million , or 3% , for the six months ended June 30, 2018 as compared to the six months ended June 30, 2017 due to the following:


•	Operating and maintenance expenses (including affiliate) increased $9.4 million , or 14% , from $65.4 million in the six months ended June 30, 2017 to $74.8 million in the six months ended June 30, 2018 .

◦

Construction Aggregates segment operating and maintenance expenses increased $7.8 million , or 15% , from $52.6 million in the six months ended June 30, 2017 to $60.5 million in the six months ended June 30, 2018 primarily as a result of higher delivery fees and production costs from the increased production activity, higher repair and maintenance expense due to timing and higher fuel costs as a result of increased diesel prices.


◦	Coal Royalty and Other segment operating and maintenance expenses increased $1.5 million , or 12% , from $12.8 million in the six months ended June 30, 2017 to $14.3 million in the six months ended June 30, 2018 primarily as a result of increased overriding royalty interest fees partially offset by lower property tax expense.


•	DD&A expense decreased primarily due to lower coal production in the Illinois Basin.


•	G&A expense decreased primarily due to performance-based awards that vested in March 2017 following the completion of our recapitalization transactions, partially offset by an increase due to our long-term incentive awards as a result of in an increase in our unit-price period-over-period and expense related to equity awards that were granted in 2018.


•	Asset impairments in the six months ended June 30, 2017 related to our timber assets. There were no material asset impairments in the six months ended June 30, 2018 .

Total other expenses decreased $19.8 million , or 36% , for the six months ended June 30, 2018 as compared to the six months ended June 30, 2017 due to the following:


•	Interest expense, net decreased primarily due to lower debt balances during the first half of 2018 as a result of progress made to repay debt.


•	Debt modification expense in the six months ended June 30, 2017 resulted from the exchange of $241 million of our 2018 Senior Notes for 2022 Senior Notes.


•	Loss on extinguishment of debt in the six months ended June 30, 2017 resulted from the 4.563% premium paid to redeem the 2018 Senior Notes in April 2017.

Adjusted EBITDA (Non-GAAP Financial Measure)

The following table reconciles net income (loss) from continuing operations (the most comparable GAAP financial measure) to Adjusted EBITDA by business segment for the six months ended June 30, 2018 and 2017 :



	Operating Segments
For the Six Months Ended (In thousands)	Coal Royalty and Other			Soda Ash			Construction Aggregates		Corporate and Financing			Total
June 30, 2018
Net income (loss) from continuing operations	$	81,378		$	26,150		$	966	$	(43,283	)	$	65,211
Less: equity earnings from unconsolidated investment	—			(26,150		)	—		—			(26,150		)
Less: net income attributable to non-controlling interest	(869		)	—			—		—			(869		)
Add: total distributions from unconsolidated investment	—			24,500			—		—			24,500
Add: interest expense, net	—			—			20		35,684			35,704
Add: depreciation, depletion and amortization	10,476			—			6,044		—			16,520
Add: asset impairments	242			—			—		—			242
Adjusted EBITDA	$	91,227		$	24,500		$	7,030	$	(7,599	)	$	115,158

June 30, 2017
Net income (loss) from continuing operations	$	77,178		$	18,683		$	1,097	$	(64,990	)	$	31,968
Less: equity earnings from unconsolidated investment	—			(18,683		)	—		—			(18,683		)
Add: total distributions from unconsolidated investment	—			24,500			—		—			24,500
Add: interest expense, net	—			—			573		42,859			43,432
Add: debt modification expense	—			—			—		7,939			7,939
Add: loss on extinguishment of debt	—			—			—		4,107			4,107
Add: depreciation, depletion and amortization	12,348			—			6,549		—			18,897
Add: asset impairments	1,778			—			—		—			1,778
Adjusted EBITDA	$	91,304		$	24,500		$	8,219	$	(10,085	)	$	113,938

Adjusted EBITDA increased $1.2 million , or 1% , from $113.9 million in the six months ended June 30, 2017 to $115.2 million in the six months ended June 30, 2018 primarily as a result of the following:


•	Coal Royalty and Other Adjusted EBITDA decreased $0.1 million primarily as a result of the decrease in gain on sale of assets and increases in operating and maintenance expenses as discussed above. These decreases were partially offset by the increase in coal royalty and other revenues and decrease in DD&A as discussed above.


•	Construction Aggregates segment Adjusted EBITDA decreased $1.2 million as a result of the increase in operating expenses as discussed above, partially offset by higher production and sales of crushed stone, gravel and sand.


•	Corporate and Financing Adjusted EBITDA increased $2.5 million as a result of the decrease in general and administrative expenses as discussed above.

Distributable Cash Flow and Free Cash Flow (Non-GAAP Financial Measure)

The following table presents the three major categories of the statement of cash flows by business segment:



	Operating Segments
For the Six Months Ended (In thousands)	Coal Royalty and Other		Soda Ash		Construction Aggregates			Corporate and Financing			Total
June 30, 2018
Net cash provided by (used in) operating activities of continuing operations	$	90,518	$	22,403	$	3,283		$	(41,614	)	$	74,590
Net cash provided by (used in) investing activities of continuing operations	1,842		2,097		(5,772		)	—			(1,833		)
Net cash used in financing activities of continuing operations	—		—		(515		)	(49,094		)	(49,609		)

June 30, 2017
Net cash provided by (used in) operating activities of continuing operations	$	76,469	$	22,112	$	9,522		$	(52,509	)	$	55,594
Net cash provided by (used in) investing activities of continuing operations	2,894		2,388		(4,613		)	—			669
Net cash provided by (used in) financing activities of continuing operations	33		—		(1,096		)	(54,788		)	(55,851		)

The following table reconciles net cash provided by operating activities (the most comparable GAAP financial measure) by business segment to DCF and FCF:



	Operating Segments
For the Six Months Ended (In thousands)	Coal Royalty and Other			Soda Ash		Construction Aggregates			Corporate and Financing			Total
June 30, 2018
Net cash provided by (used in) operating activities of continuing operations	$	90,518		$	22,403	$	3,283		$	(41,614	)	$	74,590
Add: distributions from unconsolidated investment in excess of cumulative earnings	—			2,097		—			—			2,097
Add: proceeds from sale of assets	826			—		85			—			911
Add: return on long-term contract receivables	1,016			—		—			—			1,016
Less: maintenance capital expenditures	—			—		(4,928		)	—			(4,928		)
Distributable cash flow	$	92,360		$	24,500	$	(1,560	)	$	(41,614	)	$	73,686
Less: proceeds from the sale of assets	(826		)	—		(85		)	—			(911		)
Less: expansion capital expenditures	—			—		(929		)	—			(929		)
Less: mitigation payments and acquisition costs classified as financing activities	—			—		(515		)	—			(515		)
Free cash flow	$	91,534		$	24,500	$	(3,089	)	$	(41,614	)	$	71,331

June 30, 2017
Net cash provided by (used in) operating activities of continuing operations	$	76,469		$	22,112	$	9,522		$	(52,509	)	$	55,594
Add: return of equity from unconsolidated investment	—			2,388		—			—			$	2,388
Add: proceeds from sale of assets	883			—		385			—			$	1,268
Add: return on long-term contract receivables (including affiliates)	2,011			—		—			—			$	2,011
Less: maintenance capital expenditures	—			—		(4,384		)	—			(4,384		)
Distributable cash flow	$	79,363		$	24,500	$	5,523		$	(52,509	)	$	56,877
Less: proceeds from the sale of assets	(883		)	—		(385		)	—			(1,268		)
Less: expansion capital expenditures	—			—		(614		)	—			(614		)
Less: mitigation payments and acquisition costs classified as financing activities	—			—		(1,096		)	—			(1,096		)
Free cash flow	$	78,480		$	24,500	$	3,428		$	(52,509	)	$	53,899

DCF and FCF increased $16.8 million and $17.4 million , respectively, in the six months ended June 30, 2018 as compared to the six months ended June 30, 2017 . This increase is due primarily to the following:


•	Coal Royalty and Other segment DCF increased $13.0 million and FCF increased $13.1 million as a result of the timing of cash receipts from both coal royalty production and minimums and property tax reimbursements.


•	Construction Aggregates segment DCF decreased $7.1 million and FCF decreased $6.5 million primarily due to the timing of certain operating payments.


•	Corporate and Financing DCF and FCF increased $10.9 million primarily as a result of lower G&A payments and lower cash paid for interest year-over-year.

Liquidity and Capital Resources

Current Liquidity

As of June 30, 2018 , we had total liquidity of $108.0 million , consisting of $53.0 million of cash and cash equivalents and $55.0 million in borrowing capacity under our Opco Credit Facility. We remain focused on further reducing our debt and improving our liquidity metrics.

Cash Flows

Cash flows provided by operating activities increased $19.1 million , from $55.1 million in the six months ended June 30, 2017 to $74.1 million in the six months ended June 30, 2018 primarily related to increased operating cash flows in our Coal Royalty and Other segment as a result of the timing of cash receipts from both coal royalty production and minimums and property tax reimbursements in addition to lower G&A payments and lower cash paid for interest on our debt. These increased cash flows were partially offset by lower cash provided by operating activities in our Construction Aggregates segment primarily due to the timing of certain operating payments.

Cash flows used in investing activities increased $2.7 million , from $0.9 million provided in the six months ended June 30, 2017 to $1.8 million used in the six months ended June 30, 2018 primarily due to higher capital expenditures within our Construction Aggregates segment and lower return of long-term contract receivable in our Coal Royalty and Other segment.

Cash flows used in financing activities decreased $6.4 million , from $55.5 million in the six months ended June 30, 2017 to $49.2 million in the six months ended June 30, 2018 primarily due to the decrease in debt repayments year-over-year and the debt issue costs incurred in the first quarter of 2017 related to the March 2017 recapitalization transactions. These decreases in cash outflows were partially offset by the proceeds received related to the March 2017 recapitalization transactions, a $14.0 million increase in preferred unit distributions and the $8.8 million PIK Unit redemption in the six months ended June 30, 2018 .

Capital Expenditures

On an annual basis, we generally fund most of our capital expenditures, excluding any significant property acquisitions, with cash generated from operations, and if required, borrowings under our revolving credit facility. We budget these expenditures based on our projected cash flows for the year. A portion of the capital expenditures associated with our construction aggregates segment are maintenance capital expenditures, which are capital expenditures made to maintain the long-term production capacity of those businesses. Expansion capital expenditures are made to increase productive capacity.

Capital Resources and Obligations

Debt

We had the following debt outstanding:



(In thousands)	June 30, 2018		December 31, 2017
Current portion of long-term debt, net	$	75,188	$	79,740
Long-term debt, net	723,147		729,608
Total debt, net	$	798,335	$	809,348

We have been and continue to be in compliance with the terms of the financial covenants contained in our debt agreements. For additional information regarding our debt and the agreements governing our debt, including the covenants contained therein, see Note 11. Debt to the consolidated financial statements included elsewhere in this Quarterly Report on Form 10-Q.

Off-Balance Sheet Transactions

We do not have any off-balance sheet arrangements with unconsolidated entities or related parties and accordingly, there are no off-balance sheet risks to our liquidity and capital resources from unconsolidated entities.

Related Party Transactions

The information required set forth under Note 13. Related Party Transactions to the consolidated financial statements is incorporated herein by reference.

Summary of Critical Accounting Estimates

The preparation of consolidated financial statements in conformity with generally accepted accounting principles in the United States of America requires management to make certain estimates and assumptions that affect the amounts reported in the consolidated financial statements and the accompanying notes. Significant changes to our critical accounting estimates from those disclosed in our Annual Report on Form 10-K for the year ended December 31, 2017 include estimates surrounding our implementation of the new revenue recognition standard. We evaluate the total cash flows expected under each lease to determine the likelihood that consideration received from our lessees resulting from coal production would exceed consideration received from minimum payments over the lease term. As a result of the evaluation, we either recognize revenue on our coal and aggregates royalty leases based on production or minimum payments as further described in Note 2. Revenue Recognition .

Recent Accounting Standards

The information set forth under Note 1. Basis of Presentation to the consolidated financial statements is incorporated herein by reference.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

We are exposed to market risk, which includes adverse changes in commodity prices and interest rates as discussed below:

Commodity Price Risk

We are dependent upon the effective marketing of the coal mined by our lessees. Our lessees sell the coal under various long-term and short-term contracts as well as on the spot market. Current conditions in the coal industry may make it difficult for our lessees to extend existing contracts or enter into supply contracts with terms of one year or more. Our lessees’ failure to negotiate long-term contracts could adversely affect the stability and profitability of our lessees’ operations and adversely affect our coal royalty revenues. If more coal is sold on the spot market, coal royalty revenues may become more volatile due to fluctuations in spot coal prices.

We also have market risk related to prices for our aggregates products, and those prices are primarily driven by economic conditions in the local markets in which the products are sold.

The market price of soda ash and energy costs directly affects the profitability of Ciner Wyoming’s operations. If the market price for soda ash declines, Ciner Wyoming’s sales will decrease. Historically, the global market and, to a lesser extent, the domestic market for soda ash have been volatile and are likely to remain volatile in the future. In order to mitigate the risk of energy cost fluctuations, Ciner Wyoming hedges a portion of its forecasted natural gas purchases by entering into physical or financial hedges.

Interest Rate Risk

Our exposure to changes in interest rates results from our borrowings under the Opco Credit Facility, which is subject to variable interest rates based upon LIBOR. At June 30, 2018 , we had $95.0 million outstanding in variable interest rate debt. If interest rates were to increase by 1%, annual interest expense would increase approximately $1.0 million , assuming the same principal amount remained outstanding during the year.

ITEM 4. CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

NRP carried out an evaluation of the effectiveness of the design and operation of its disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) of the Securities Exchange Act) as of the end of the period covered by this report. This evaluation was performed under the supervision and with the participation of NRP management, including the Chief Executive Officer and Chief Financial Officer of the general partner of the general partner of NRP. Based upon that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that these disclosure controls and procedures are effective in providing reasonable assurance that (a) the information required to be disclosed by us in the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms, and (b) such information is accumulated and communicated to our management, including our CEO and CFO, as appropriate to allow timely decisions regarding required disclosure.

Changes in the Partnership’s Internal Control Over Financial Reporting

There were no material changes in the Partnership’s internal control over financial reporting during the first six months of 2018 that materially affected, or were reasonably likely to materially affect, the Partnership’s internal control over financial reporting.

PART II

ITEM 1. LEGAL PROCEEDINGS

From time to time, we are involved in various legal proceedings arising in the ordinary course of business. While the ultimate results of these proceedings cannot be predicted with certainty, we believe these claims will not have a material effect on our financial position, liquidity or operations.

For more information regarding certain other legal proceedings involving the Partnership, including the lawsuits involving Anadarko and Foresight, see Note 15. Commitments and Contingencies to the consolidated financial statements included elsewhere in this Quarterly Report on Form 10-Q, which is incorporated herein by reference.

ITEM 1A. RISK FACTORS

During the period covered by this report there were no material changes from the risk factors previously disclosed in Natural Resource Partners L.P.’s Annual Report on Form 10-K for the year ended December 31, 2017 .

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

None.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4. MINE SAFETY DISCLOSURES

The information concerning mine safety violations or other regulatory matters required by SEC regulations is included in Exhibit 95.1 to this Quarterly Report on Form 10-Q.

ITEM 5. OTHER INFORMATION

None.

ITEM 6. EXHIBITS



Exhibit Number		Description
2.1		Purchase Agreement, dated as of January 23, 2013, by and among Anadarko Holding Company, Big Island Trona Company, NRP Trona LLC and NRP (Operating) LLC (incorporated by reference to Exhibit 2.1 to Current Report on Form 8-K filed on January 25, 2013).
3.1		Fifth Amended and Restated Agreement of Limited Partnership of Natural Resource Partners L.P., dated as of March 2, 2017 (incorporated by reference to Exhibit 3.1 to Current Report on Form 8-K filed on March 6, 2017).
3.2		Fifth Amended and Restated Agreement of Limited Partnership of NRP (GP) LP, dated as of December 16, 2011 (incorporated by reference to Exhibit 3.1 to Current Report on Form 8-K filed on December 16, 2011).
3.3		Fifth Amended and Restated Limited Liability Company Agreement of GP Natural Resource Partners LLC, dated as of October 31, 2013 (incorporated by reference to Exhibit 3.1 to Current Report on Form 8-K filed on October 31, 2013).
3.4		Certificate of Limited Partnership of Natural Resource Partners L.P.(incorporated by reference to Exhibit 3.1 to the Registration Statement on Form S-1 filed April 19, 2002, File No. 333-86582).
31.1*		Certification of Chief Executive Officer pursuant to Section 302 of Sarbanes-Oxley.
31.2*		Certification of Chief Financial Officer pursuant to Section 302 of Sarbanes-Oxley.
32.1**		Certification of Chief Executive Officer pursuant to 18 U.S.C. § 1350.
32.2**		Certification of Chief Financial Officer pursuant to 18 U.S.C. § 1350.
95.1*		Mine Safety Disclosure.
101.INS*		XBRL Instance Document
101.SCH*		XBRL Taxonomy Extension Schema Document
101.CAL*		XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF*		XBRL Taxonomy Extension Definition Linkbase Document
101.LAB*		XBRL Taxonomy Extension Labels Linkbase Document
101.PRE*		XBRL Taxonomy Extension Presentation Linkbase Document

*		Filed herewith
**		Furnished herewith

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned and thereunto duly authorized.



	NATURAL RESOURCE PARTNERS L.P.
	By:	NRP (GP) LP, its general partner
	By:	GP NATURAL RESOURCE
		PARTNERS LLC, its general partner

Date: August 9, 2018
	By:	/s/ CORBIN J. ROBERTSON, JR.
		Corbin J. Robertson, Jr.
		Chairman of the Board and
		Chief Executive Officer
		(Principal Executive Officer)



Date: August 9, 2018
	By:	/s/ CHRISTOPHER J. ZOLAS
		Christopher J. Zolas
		Chief Financial Officer and Treasurer
		(Principal Financial Officer)

Date: August 9, 2018
	By:	/s/ JENNIFER L. ODINET
		Jennifer L. Odinet
		Chief Accounting Officer
		(Principal Accounting Officer)

TABLE OF CONTENTS

Part I. Financial Information Item 1. Consolidated Financial Statements Item 2. Management's Discussion and Analysis Of Financial Condition and Results Of Operations Item 3. Quantitative and Qualitative Disclosures About Market Risk Item 4. Controls and Procedures Part II Item 1. Legal Proceedings Item 1A. Risk Factors Item 2. Unregistered Sales Of Equity Securities and Use Of Proceeds Item 3. Defaults Upon Senior Securities Item 4. Mine Safety Disclosures Item 5. Other Information Item 6. Exhibits

Exhibits

2.1 Purchase Agreement, dated as of January 23, 2013, by and among Anadarko Holding Company, Big Island Trona Company, NRP Trona LLC and NRP (Operating) LLC (incorporated by reference to Exhibit 2.1 to Current Report on Form 8-K filed on January 25, 2013). 3.1 Fifth Amended and Restated Agreement of Limited Partnership of Natural Resource Partners L.P., dated as of March 2, 2017 (incorporated by reference to Exhibit 3.1 to Current Report on Form 8-K filed on March 6, 2017). 3.2 Fifth Amended and Restated Agreement of Limited Partnership of NRP (GP) LP, dated as of December 16, 2011 (incorporated by reference to Exhibit 3.1 to Current Report on Form 8-K filed on December 16, 2011). 3.3 Fifth Amended and Restated Limited Liability Company Agreement of GP Natural Resource Partners LLC, dated as of October 31, 2013 (incorporated by reference to Exhibit 3.1 to Current Report on Form 8-K filed on October 31, 2013). 31.1* Certification of Chief Executive Officer pursuant to Section 302 of Sarbanes-Oxley. 31.2* Certification of Chief Financial Officer pursuant to Section 302 of Sarbanes-Oxley. 32.1** Certification of Chief Executive Officer pursuant to 18 U.S.C. 1350. 32.2** Certification of Chief Financial Officer pursuant to 18 U.S.C. 1350. 95.1* Mine Safety Disclosure.

NRP 10-Q Quarter ended June 30, 2018

Exhibits