Ownership Submission
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
OMB APPROVAL
OMB Number: 3235-0287
Expires: January 31, 2005
Estimated average burden hours per response... 0.5

(Print or Type Responses)
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.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number. SEC 1474 (9-02)

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.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.