UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): October 19, 2006

GRAN TIERRA ENERGY INC.

(f/k/a GOLDSTRIKE INC.)

(Exact name of registrant as specified in its charter)

Nevada	333-111656	98-0479924
(State or other jurisdiction of incorporation)	(Commission File Number)	(I.R.S. Employer Identification Number)

300, 611 - 10th Avenue S.W.
Calgary, Alberta, Canada	T2R 0B2
(Address of principal executive offices)	(Zip Code)

(403) 265-3221

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

¨ Written communications pursuant to Rule 425 under the Securities Act

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act

Item 8.01 Other Events.

On February 22, 2006, Gran Tierra Energy Inc. (the “Company”) filed a Current Report on Form 8-K disclosing that the Company had made an offer to acquire certain interests of Compañía General de Combustibles S.A. (“CGC”). The Company offered to purchase CGC’s participation interests in a total of eight properties in Argentina. As disclosed in the Company’s Current Report on Form 8-K filed on August 8, 2006 the transaction is subject to Argentinean court approvals, the potential exercise of rights of first refusal and the need to obtain third-party consents.

The Company has received evidence that court approval in Argentina has now been granted. According to the purchase agreement with CGC, the Company is obligated to purchase interests in four properties (a 93.18% participation in the Valle Morado Block, a 100% interest in the Santa Victoria Block and the remaining 50% interests in the Nacatimbay and Ipaguazu Blocks (in which the Company currently holds 50% interests)) for a total consideration of $2.1 million. The Company is considering its options to acquire the interests in the remaining four properties, which interests remain subject to rights of first refusal among joint venture partners and other third party consents.

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 hereunto duly authorized.

Gran Tierra Energy Inc.

By:      /s/ James Hart                                              

Name: James Hart

Title:   Chief Financial Officer

Date:   October 23, 2006