Exhibit 10.39

DEED dated 10thAugust 2006

PARTIES



|1. | SYNTROLEUM NIGERIA LIMITED, a company existing under the laws of the Federal Republic of Nigeria and having its registered office at St Nicholas House, 9th Floor, Catholic
Mission Street, Lagos, Nigeria (Syntroleum); and
|-- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|2. | ENERGY EQUITY RESOURCES OIL & GAS LIMITED, a company existing under the laws of the Federal Republic of Nigeria and having its registered office at St. Nicholas
House, 9th Floor, Catholic Mission Street, Lagos, Nigeria (EERO&G).
|-- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

BACKGROUND



|A. | The parties have executed and created the deed entitled Option Deed relating to the Oil Mining Lease 113 Offshore
Nigeria and dated 26thJuly 2006 (Principal Agreement).
|-- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|B. | The parties by mutual agreement wish to amend the Principal Agreement upon and subject to the provisions of this Deed.
|-- | ----------------------------------------------------------------------------------------------------------------------

PROVISIONS

THIS DEED PROVIDES:



|1. | INTERPRETATION
|-- | --------------



|1.1 | Definitions
|--- | -----------

Meanings apply to capitalised terms
used in this Deed as specified in this provision, unless the context otherwise requires.

Effective Date means 10thAugust 2006; and

Principal Agreementmeans the Principal Agreement as amended by any deed or agreement executed and created by and between the parties
at any time prior to the date of this Deed.



|1.2 | Principal Agreement Definitions
|--- | -------------------------------

Meanings apply to
words and expressions and capitalised terms used but not separately defined in this Deed as specified in the definitions provision of the Principal Agreement, unless the context otherwise requires.



|1.3 | Interpretational Rules
|--- | ----------------------

Rules of interpretation
apply to this Deed as specified in the interpretational



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rules provision of the Principal Agreement and in this provision, unless the context otherwise requires, any reference to a provision is a reference to a
clause of the Principal Agreement or this Deed including each subclause, paragraph and subparagraph of that provision.



|2. | CONTRACT AMENDMENT
|-- | ------------------

The Principal Agreement is
amended by:



| | (a) | the deletion of the definition Okwok Deed in clause 1.1; and
| | --- | --------------------------------------------------------------



| | (b) | the deletion of clauses 1.3.1 and 1.3.2 and the substitution in lieu thereof of the provision specified below:
| | --- | --------------------------------------------------------------------------------------------------------------

This Deed shall become effective on the day and year first above written.,

with effect on and from the Effective Date.



|3. | CONTRACT CONFIRMATION
|-- | ---------------------

The Principal Agreement
continues in full force and effect upon and subject to its provisions, except to the extent amended by clause 2 of this Deed.



|4. | EXERCISE OF OPTION
|-- | ------------------

By this Deed and pursuant to
clause 5.2 of the Principal Agreement EERO&G gives and Syntroleum accepts notice of exercise of the Option.



|5. | OTHER PROVISIONS
|-- | ----------------

The provisions of clauses 7 and 8
of the Principal Agreement apply mutatis mutandisto this Deed.



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|------------------------------------------------------------------------------------------------------------------------------------------- |  | ----- |  |  | ---------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------
|EXECUTED as a deed. SIGNED and DELIVERED for and on behalf of SYNTROLEUM NIGERIA LIMITED by its duly appointed attorney in the presence of: |  | ))))) |  |  |                                          | /s/ Michael L. Covey Jr.                                                                                                                            
|                                                                                                                                            |  |       |  |  | Attorney Full Name: Michael L. Covey
Jr.
|/s/ John B. Holmes Jr.                                                                                                                      |  |       |  |  |                                          | Power of Attorney date: July 24, 2006 Certified that the attorney has no notice of the revocation of the power of attorney at the time of signature.
|Witness Full Name: John B. Holmes Jr.                                                                                                       |  |       |  |  |                                         
|                                                                                                                                            |  |       | 
|SIGNED and DELIVERED for and on behalf of ENERGY EQUITY RESOURCES OIL & GAS LIMITED by its duly appointed Attorney in the presence of:      |  | ))))) |  |  |                                          | /s/ Dr Philip Vingoe                                                                                                                                
|                                                                                                                                            |  |       |  |  | Attorney Full Name:Dr Philip
Vingoe     
|                                                                                                                                            |  |       | 
|/s/ Olav Eimstad                                                                                                                            |  |       |  |  |                                          | Power of Attorney date: 24thJuly 2006 Certified that the attorney has no notice of the revocation of the power of attorney at the time of
signature.
|Witness Full Name: Olav Eimstad                                                                                                             |  |       |  |  |                                         



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