FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * ROBERTSON CORBIN J III   2. Issuer Name and Ticker or Trading Symbol NATURAL RESOURCE PARTNERS LP [NRP] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 601 JEFFERSON, SUITE 3600 3. Date of Earliest Transaction (Month/Day/Year) 05/21/2013 (Street) HOUSTON, TX 77002 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Units               1,487,619 D (1)   Common Units               387 I By Spouse (2) Common Units               50,461 I By The Corbin James Robertson III 2009 Family Trust (3) Common Units               26,231 I By CIII Capital Management, LLC (4)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Phantom Units (5)

(6) (7)

05/21/2013

A

3,475

02/11/2014

02/11/2014

Common Units

3,475

(6) (7)

3,475

D

Phantom Units (5)

(6) (7)

05/21/2013

A

3,580

02/10/2015

02/10/2015

Common Units

3,580

(6) (7)

3,580

D

Phantom Units (5)

(6) (7)

05/21/2013

A

3,700

02/14/2016

02/14/2016

Common Units

3,700

(6) (7)

3,700

D

Phantom Units (5)

(6) (7)

05/21/2013

A

3,700

02/13/2017

02/13/2017

Common Units

3,700

(6) (7)

3,700

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
ROBERTSON CORBIN J III 601 JEFFERSON, SUITE 3600 HOUSTON, TX 77002	X

Signatures

Corbin J. Robertson III		05/22/2013
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Corbin J. Robertson III shares beneficial ownership of 23,873 common units with his spouse, Brooke Robertson.
(2)	Corbin J. Robertson III disclaims beneficial ownership of these common units, and this report shall not be deemed an admission that Corbin J. Robertson III is the beneficial owner of such common units for purposes of Section 16 or for any other purpose.
(3)	The beneficiary of The Corbin James Robertson III 2009 Family Trust is the family of Corbin J. Robertson III. Corbin J. Robertson III is the Trust Advisor for The Corbin James Robertson III 2009 Family Trust and may be deemed to beneficially own the common units owned by The Corbin James Robertson III 2009 Family Trust.
(4)	Corbin J. Robertson III is the controlling Manager of CIII Capital Management, LLC and may be deemed to beneficially own the common units owned by CIII Capital Management, LLC.
(5)	The phantom units were granted to the reporting person under the issuer's long-term incentive plan.
(6)	Award includes tandem distribution equivalent rights pursuant to which the quarterly distributions paid by the partnership on each unit will be accrued over the vesting period and paid on vesting.
(7)	The phantom units will be paid in cash based on the average closing price of the common units for the 20 trading days immediately prior to the date of vesting.

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