Document:

Exhibit
      10.1 

    

    Gran
      Tierra Energy Inc. is soliciting consents pursuant to this Consent Letter only
      in jurisdictions where such solicitation is permitted. This Consent Letter
      is
      not a solicitation in any circumstances under which the solicitation is
      unlawful. 

     

    CONSENT
      LETTER

    of

    GRAN
      TIERRA ENERGY INC.

    

    Solicitation
      of Consents and Waivers Relating to

    Registration
      Rights Agreements June 16, June 20 and June 30, 2006 among Gran Tierra Energy
      Inc. and certain parties

     

    Pursuant
      to the Consent Solicitation Request Letter dated May 29,
      2007

    

    
      	
              THE
                CONSENT SOLICITATION WILL EXPIRE AT 5:00 P.M., MOUNTAIN TIME, ON
                JUNE 27,
                2007 (SUCH TIME AND DATE AS THE SAME MAY BE EXTENDED, THE
                “EXPIRATION TIME”).
                CONSENTS MAY ONLY BE REVOKED UNDER THE CIRCUMSTANCES DESCRIBED IN
                THE
                CONSENT SOLICITATION
                REQUEST LETTER AND THIS CONSENT
                LETTER.

            

    

     

    Delivery
      of this Consent Letter to an address other than as set forth on the last page
      of
      this Consent Letter, or transmission of instructions via a fax number other
      than
      as set forth on the last page of this Consent Letter, will not constitute a
      valid delivery.

    

    All
      capitalized terms used herein and not defined herein shall have the
      meaning ascribed
      to them in the Company’s Consent Solicitation Request Letter, dated May 29, 2007
      (the “Consent
      Solicitation Letter”).

    

    NOTE:
      SIGNATURES MUST BE PROVIDED BELOW

    

    PLEASE
      READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY

    

    This
      Consent Letter is to be used by the signatories of four Registration Rights
      Agreements dated June 16, June 20 and June 30, 2006 (the “Registration
      Rights Agreements”)
      between Gran Tierra Energy Inc. (“Gran
      Tierra”)
      and the
      holders (the “Holders”)
      of
      outstanding shares of common stock (the “Shares”)
      and
      warrants (the “Warrants”)
      to
      purchase common stock (the “Units”)
      of Gran
      Tierra purchased pursuant to an offering by Gran Tierra in June 2006. Valid
      deliveries of Consents must be delivered to:

    

    Brian
      Suzuki

    Cooley
      Godward Kronish LLP

    Five
      Palo
      Alto Square • 3000 El Camino Real

    Palo
      Alto, CA 94306-2155

    

    or
      alternatively, this Consent can be faxed to Brian Suzuki at (650) 849-7400,
      or
      e-mailed in PDF format to Mr. Suzuki at bsuzuki@cooley.com
      on or
      before the Expiration Time. Only registered owners of the Units or their duly
      designated proxies, are eligible to consent to waive accrued monetary liquidated
      penalties, an existing breach under the Registration Rights Agreements, and
      amend the terms of the Warrants, all as described in the Consent Solicitation
      Letter and below, occurring on or prior to the effective date of the Amendment
      (as defined below) and, if they validly Consent and do not revoke their Consent
      prior to the Expiration Time, to receive the benefits of the amended Warrants
      (as defined below). However, following the effectiveness of the Amendment,
      all
      Holders of Warrants will be entitled to receive the benefits of the Amended
      Warrant. Under the terms of each Registration Rights Agreement, Gran Tierra
      must
      obtain the Consent of the holders of a majority of the then outstanding Units
      under each such Registration Rights Agreement for the waiver and Consent to
      apply to all Holders party to such Registration Rights Agreement (the
“Requisite
      Consent”).

     

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

     

    Holders
      who desire to deliver Consents pursuant to the Consent Solicitation
      and receive
      the Amended Warrants are required to deliver their Consents to Brian Suzuki
      at
      Cooley Godward Kronish LLP to arrive on or prior to the Expiration
      Time.

    

    The
      undersigned should complete, execute and deliver this Consent Letter to indicate
      the action the undersigned desires to take with respect to the Consent
      Solicitation.

    

    List
      below the Units to which this Consent Letter relates. If the space provided
      is
      inadequate, list the certificate numbers and principal amounts on a separately
      executed schedule and affix the schedule to this Consent Letter.

    

    
      	
              Name(s)
                and Address(es)

              of

              Registered
                Holder(s)

              (Please
                fill in blank)

            	 	
               

               

               

               

              Date
                Purchased

            	 	
              Number
                of Units Held

              as
                to which

              Consents
                are Given

              (Complete
                only if

              less
                than entire

              aggregate
                number of Units held)

            
	 	 	 	 	 
	 	 	 	 	 
	 	 	 	 	 
	 	 	 	 	 
	 	 	 	 	 

    

     

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

     

    Ladies
      and Gentlemen,

    

    Upon
      the
      terms and subject to the conditions set forth in the Consent Solicitation
      Letter, receipt of which is hereby acknowledged, and in accordance with this
      Consent Letter, the undersigned hereby consents to: 

     

    
      	1.  	
              A
                waiver of all liquidated damages, together with any interest and
                penalties
                related thereto, owed by Gran Tierra under Section 2(d) of the
                Registration Rights Agreements to the Holders as a result of its
                failure
                to have the Mandatory Registration Statement (as defined in the
                Registration Rights Agreements) declared effective by the Securities
                and
                Exchange Commission (“SEC”)
                by November 17, 2006;

            

    

     

    
      	2.  	
              A
                waiver of the breach of Section 2(e) of the Registration Rights Agreement
                which existed as a result of the SEC declaring effective on February
                14,
                2007 a registration statement (which was not the Mandatory Registration
                Statement) previously filed by Gran Tierra for shares of common stock
                acquired by certain of Gran Tierra’s shareholders in a previous offering;
                and

            

    

     

    
      	3.  	
              An
                amendment of the Warrants to provide that the exercise price shall
                be
                $1.05 per share and the expiry date of each Warrant will be extended
                one
                year from the original expiry date.

            

    

     

    For
      purposes of this Consent Letter, the waivers identified in paragraphs 1 and
      2
      above shall be referred to herein as the “Waived
      Defaults”
      and the
      amendment referred to in paragraph 3 above shall be referred to herein as the
      “Amendment”,
      and
      the Warrants as so amended shall be referred to herein as the “Amended
      Warrants”. 

     

    The
      undersigned agrees and acknowledges that, by the execution and delivery hereof,
      the undersigned makes and provides the written Consent to the Waived Defaults
      and to the Amendment (with respect to the Units indicated in the table above).
      If the Requisite Consent is obtained, the undersigned agrees and acknowledges
      that the Waived Defaults with respect to the Registration Rights Agreement
      will
      cease to exist and any default or events of default under the Registration
      Rights Agreements will be deemed to have been cured for all purposes
      thereunder.

    

    If
      the
      undersigned is not the registered Holder of the Units listed in the box above
      labeled “Description of Units” under the column heading “Aggregate Number of
      Units Represented” or such Holder’s legal representative or attorney-in-fact,
      then to consent validly, the undersigned must obtain a properly completed
      irrevocable proxy that authorizes the undersigned (or the undersigned’s legal
      representative or attorney-in-fact) to deliver Consent in respect of such Units
      on behalf of the Holder thereof, and such proxy must be delivered with this
      Consent Letter.

    

    The
      undersigned understand(s) that valid delivery of the Consent pursuant to any
      of
      the procedures described in the Consent Solicitation Request Letter and in
      the
      instructions hereto will constitute a binding agreement between the undersigned
      and the Company upon the terms and subject to the conditions of the Consent
      Solicitation Request Letter. For purposes of the Consent with respect to the
      Units, Consents received by Brian Suzuki at Cooley Godward Kronish LLP will
      be
      deemed to have been accepted at the Expiration Time if the Company has accepted
      the Consents in exchange for the Amendment by the Company on or promptly after
      the Effective Date.

    

    The
      undersigned hereby represents and warrants that the undersigned has full power
      and authority to give the Consent contained herein. The undersigned will, upon
      request, execute and deliver any additional documents deemed by the Company
      to
      be necessary or desirable to perfect the undersigned’s Consent to the Proposed
      Amendment and waiver of all Waived Defaults with respect thereto. 

    

    All
      authority conferred or agreed to be conferred by this Consent Letter shall
      not
      be affected by, and shall survive, the death or incapacity of the undersigned,
      and any obligation of the undersigned hereunder shall be binding upon the heirs,
      executors, administrators, trustees in bankruptcy, personal and legal
      representatives, successors and assigns of the undersigned.

    

    All
      questions as to the form of all documents and the validity (including time
      of
      receipt) and deliveries of Consents will be determined by the Company, in its
      sole discretion, which determination shall be final and binding.

     

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

     

    INSTRUCTIONS

    

    Forming
      Part of the Terms and Conditions of the Consent
      Solicitation

    

    1.
      Delivery
      of Consent Letter.
      This
      Consent Letter may only be executed by Holders if Consents are to be delivered.
      All properly completed and duly executed Consent Letters (or a copy thereof)
      and
      any other documents required by this Consent Letter must be received by Brian
      Suzuki at Cooley Godward Kronish LLP at the address or facsimile set forth
      herein on or prior to the Expiration Time. 

    

    The
      method of delivery of this Consent Letter and all other required documents
      is
      at the
      option and risk of the consenting Holder. If
      delivery is by mail, registered mail with return receipt requested, properly
      insured, is recommended. In all cases, sufficient time should be allowed for
      such documents to reach Brian Suzuki at Cooley Godward Kronish LLP on or before
      the Expiration Time.

    

    No
      alternative, conditional or contingent Consents will be accepted. All consenting
      Holders, by execution of this Consent Letter (or a copy thereof), waive any
      right to receive any notice of the acceptance of their Consents for
      payment.

    

    2.
      Partial
      Consents. If
      Holders wish to consent with respect to less than all of the Holders’ Units,
      such Holders must fill in the number of Units for which Consents are to be
      delivered in the box above labeled “Number of Units Held as to which Consents
      are Given.” The entire principal amount that is represented by Units listed will
      be deemed to have been consented to the Consent and Amendment with respect
      to
      all Units, unless otherwise indicated.

    

    3.
      Signature
      on Consent Letter.
      If this
      Consent Letter is signed by the registered Holders of Units for which the
      Consents are delivered hereby, the signatures must correspond with the name(s)
      as written on the face of the certificate(s) without alteration, enlargement
      or
      any change whatsoever. If any Units for which Consents are delivered hereby
      are
      registered in the name of two or more Holders, all such Holders must sign this
      Consent Letter. If any Units for which Consents are delivered hereby are
      registered in different names on several certificates, it will be necessary
      to
      complete, sign and submit as many separate Consent Letters as there are
      different registrations of certificates.

    

    If
      this
      Consent Letter or any Units or instrument of transfer is signed by a proxy,
      trustee, executor, other administrator, guardian, attorney-in-fact, agent,
      officer of a corporation or other person acting in a fiduciary or representative
      capacity, such person should so indicate when signing, and proper evidence
      satisfactory to the Company of such person’s authority to so act must be
      submitted.

    

    4.
      Waiver
      of Conditions.
      The
      conditions of the Consent Solicitation may be amended or waived by the Company,
      in whole or in part, at any time and from time to time in the Company’s sole
      discretion, in the case of any Consents delivered.

    

    5.
      Request
      for Assistance or Additional Copies.
      Any
      questions or requests for assistance or additional copies of the Consent
      Solicitation Letter or this Consent Letter may be directed to Martin Eden of
      Gran Tierra at its telephone number and location listed on the back cover.
      

     

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

     

    PLEASE
      SIGN HERE

    (To
      be
      completed by all Consenting Holders of Units)

    

    By
      completing, executing and delivering this Consent Letter, the undersigned hereby
      consents by delivering this Consent, as noted in the box above with respect
      to
      the Units listed in the box above, to the waiver of the Waived Defaults and
      the
      Amendment.

    

    The
      undersigned makes one of the following representations regarding its net worth
      and certain related matters and has checked the applicable
      representation:

     

    (
      ) (i) The
      undersigned is a trust with total assets in excess of $5,000,000 whose purchase
      is directed by a person with such knowledge and experience in financial and
      business matters that such person is capable of evaluating the merits and risks
      of the prospective investment.

     

    (
      ) (ii) The
      undersigned is a bank, insurance company, investment company registered under
      the United States Investment Company Act of 1940, as amended (the “Companies
      Act”),
      a
      broker or dealer registered pursuant to Section 15 of the United States
      Securities Exchange Act of 1934, as amended, a business development company,
      a
      Small Business Investment Company licensed by the United States Small Business
      Administration, a plan with total assets in excess of $5,000,000 established
      and
      maintained by a state for the benefit of its employees, or a private business
      development company as defined in Section 202(a)(22) of the United States
      Investment Advisers Act of 1940, as amended.

     

    (
      ) (iii) The
      undersigned is an employee benefit plan and either all investment decisions
      are
      made by a bank, savings and loan association, insurance company, or registered
      investment advisor, or the undersigned has total assets in excess of $5,000,000
      or, if such plan is a self-directed plan, investment decisions are made solely
      by persons who are accredited investors.

     

    (
      ) (iv) The
      undersigned is a corporation, partnership, business trust, not formed for the
      purpose of acquiring the Securities, or an organization described in Section
      501(c)(3) of the Internal Revenue Code of 1986, as amended (the “Code”),
      in
      each case with total assets in excess of $5,000,000.

     

    (
      ) (v) The
      undersigned is an entity in which all of the equity owners (in the case of
      a
      revocable living trust, its grantor(s)) qualify under any of the above
      subparagraphs, or, if an individual, each such individual has a net worth ,
      either individually or upon a joint basis with such individual’s spouse, of at
      least $1,000,000 (within the meaning of such terms as used in the definition
      of
“accredited investor” contained in Rule 501 under the Securities Act), or has
      had an individual income in excess of $200,000 for each of the two most recent
      years, or a joint income with such individual’s spouse in excess of $300,000 in
      each of those years, and has a reasonable expectation of reaching the same
      income level in the current year.

    

    This
      Consent Letter must be signed by the registered Holder(s) exactly as the name(s)
      appear(s) on certificate(s) representing Units, or by person(s) authorized
      to
      become registered Holder(s) by endorsements and documents transmitted herewith.
      If signature is by proxy, trustees, executors, administrators, guardians,
      attorneys-in-fact, officers of corporations or others acting in a fiduciary
      or
      representative capacity, please set forth full title and see Instruction
      5.

     

    Signature(s)
      of Registered Holder(s) or Authorized Signatory

     

    Signature(s)
      of Holder(s) or Authorized Signatory

    

    Dated
      ______________________________________________________________________________________________________

    

    Name(s)
      ____________________________________________________________________________________________________

    (Please
      Print)

    

    Capacity
      ____________________________________________________________________________________________________

    

    Address
      ____________________________________________________________________________________________________

    (Including
      Zip)

    

    Area
      Code
      and Telephone No.
      ___________________________________________________________________________________

    

    Tax
      Identification or Social Security No.
      __________________________________________________________________________

     

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

     

    Manually
      signed copies of the Consent Letter will be accepted. The Consent Letter and
      any
      other required documents should be sent or delivered by each Holder or such
      Holder’s broker, dealer, bank, trust company or other nominee to the Depositary
      at one of its addresses set forth below.

    

    Any
      questions or requests for assistance may be directed to Gran Tierra at the
      address and telephone number set forth below. Requests for additional copies
      of
      the Consent Solicitation Letter or this Consent Letter may be directed to Gran
      Tierra at the address and telephone number set forth below.

    

    GRAN
      TIERRA ENERGY INC.

    300,
      611 10th Ave SW

    Calgary,
      AB Canada T2R 0B2

    1-403-265-3221
      ext 230

    Attn:
      Martin EdenExhibit
      10.6

    

    Schedule
      identifying material details of Restricted Stock Agreement substantially
      identical to the Agreement filed in Exhibit 10.5 (as filed
      herewith)

    

    

    Restricted
      Stock Purchase Agreement dated June 1, 2006 by and between Velcera
      Pharmaceuticals, Inc. and Antonio M. Benitz; with respect to 100,000 shares
      of
      the Company’s common stock.

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