Document:

Exhibit 4.16  

September 6,
2006 

Yamana
Gold Inc.

Ontario Securities Commission (Principal Regulator)

British Columbia Securities Commission

Alberta Securities Commission

Saskatchewan Securities Commission

The Manitoba Securities Commission

Autorite des Marches Financiers

Office of the Administrator, New Brunswick

Nova Scotia Securities Commission

Securities Commission of Newfoundland and Labrador

Registrar of Securities, Prince Edward Island 

Dear
Sirs/Mesdames: 

Re: Yamana Gold Inc. (the "Company")  

        Pursuant to Section 8.3 of National Instrument 43-101, this letter is being filed as the consent of Chlumsky, Armbrust and
Meyer, LLC to being named in a take-over bid circular of the Company dated September 6, 2006 (the "Circular") and to the inclusion of reference to the following report
(the "Circular") and of extracts from or a summary of the Report in the written disclosure contained in the Prospectus or any other documents incorporated by reference therein: 

        "Technical
Report San Andrés Project Honduras, dated October 21, 2005." 

        We
hereby confirm that we have read the written disclosure of the Report and extracts from or a summary of the Report contained in the Circular and have no reason to believe that there
are any misrepresentations in the information contained
therein that (i) are derived from the Report, or (ii) are within the knowledge of the undersigned as a result of the services performed by the undersigned in connection with the Report. 

Sincerely,

	
 /s/  KENNETH L. MEYER      
 Kenneth L. Meyer, Principal

Chlumsky, Armbrust and Meyer, LLCExhibit 4.17  

September 6,
2006 

Yamana
Gold Inc.

Ontario Securities Commission (Principal Regulator)

British Columbia Securities Commission

Alberta Securities Commission

Saskatchewan Securities Commission

The Manitoba Securities Commission

Autorite des Marches Financiers

Office of the Administrator, New Brunswick

Nova Scotia Securities Commission

Securities Commission of Newfoundland and Labrador

Registrar of Securities, Prince Edward Island 

Dear
Sirs/Mesdames: 

Re: Yamana Gold Inc. (the "Company")  

        Pursuant to Section 8.3 of National Instrument 43-101, this letter is being filed as the consent of Kenneth L. Meyer, of Chlumsky,
Armbrust and Meyer, LLC to being named in a take-over bid circular of the Company dated September 6, 2006 (the "Circular") and to the inclusion of reference to the
following report (the "Report") and of extracts from or a summary of the Report in the written disclosure contained in the Circular or any other documents incorporated by reference therein: 

        "Technical
Report San Andrés Project Honduras, dated October 21, 2005." 

        I
hereby confirm that I have read the written disclosure of the Report and extracts from or a summary of the Report contained in the Circular and have no reason to believe that there are
any misrepresentations in the information contained therein that (i) are derived from the Report, or (ii) are within my knowledge as a result of the services performed by the undersigned
in connection with the Report. 

Sincerely,

	
 /s/  KENNETH L. MEYER      
 Kenneth L. Meyer

Chlumsky, Armbrust and Meyer, LLCExhibit 4.18  

September 6,
2006 

Yamana
Gold Inc.

Ontario Securities Commission (Principal Regulator)

British Columbia Securities Commission

Alberta Securities Commission

Saskatchewan Securities Commission

The Manitoba Securities Commission

Autorite des Marches Financiers

Office of the Administrator, New Brunswick

Nova Scotia Securities Commission

Securities Commission of Newfoundland and Labrador

Registrar of Securities, Prince Edward Island 

Dear
Sirs/Mesdames: 

Re: Yamana Gold Inc. (the "Company")  

        Pursuant to Section 8.3 of National Instrument 43-101, this letter is being filed as the consent of George A. Armbrust, PhD., CPG, of
Chlumsky, Armbrust and Meyer, LLC to being named in a take-over bid circular of the Company dated September 6, 2006 (the "Circular") and to the inclusion of reference
to the following report (the "Report") and of extracts from or a summary of the Report in the written disclosure contained in the Circular or any other documents incorporated by reference
therein: 

        "Technical
Report San Andrés Project Honduras, dated October 21, 2005." 

        I
hereby confirm that I have read the written disclosure of the Report and extracts from or a summary of the Report contained in the Circular and have no reason to believe that there are
any misrepresentations in the information contained therein that (i) are derived from the Report, or (ii) are within my knowledge as a result of the services performed by the undersigned
in connection with the Report. 

Sincerely,

	
 /s/  GEORGE A. ARMBRUST      
 George A. Armbrust, PhD., CPG

Chlumsky, Armbrust and Meyer, LLCExhibit 4.19  

September 6,
2006 

Yamana
Gold Inc.

Ontario Securities Commission (Principal Regulator)

British Columbia Securities Commission

Alberta Securities Commission

Saskatchewan Securities Commission

The Manitoba Securities Commission

Autorite des Marches Financiers

Office of the Administrator, New Brunswick

Nova Scotia Securities Commission

Securities Commission of Newfoundland and Labrador

Registrar of Securities, Prince Edward Island 

Dear
Sirs/Mesdames: 

Re: Yamana Gold Inc. (the "Company")  

        Pursuant to Section 8.3 of National Instrument 43-101, this letter is being filed as the consent of Robert L. Sandefur, P.E., of
Chlumsky, Armbrust and Meyer, LLC to being named in a take-over bid circular of the Company dated September 6, 2006 (the "Circular") and to the inclusion of reference
to the following report (the "Report") and of extracts from or a summary of the Report in the written disclosure contained in the Circular or any other documents incorporated by reference
therein: 

        "Technical
Report San Andrés Project Honduras, dated October 21, 2005." 

        I
hereby confirm that I have read the written disclosure of the Report and extracts from or a summary of the Report contained in the Circular and have no reason to believe that there are
any misrepresentations in the information contained therein that (i) are derived from the Report, or (ii) are within my knowledge as a result of the services performed by the undersigned
in connection with the Report. 

Sincerely,

	
 /s/  ROBERT L. SANDEFUR      
 Robert L. Sandefur, P.E.

Chlumsky, Armbrust and Meyer, LLCExhibit 4.20  

September 6,
2006 

Yamana
Gold Inc.

Ontario Securities Commission (Principal Regulator)

British Columbia Securities Commission

Alberta Securities Commission

Saskatchewan Securities Commission

The Manitoba Securities Commission

Autorite des Marches Financiers

Office of the Administrator, New Brunswick

Nova Scotia Securities Commission

Securities Commission of Newfoundland and Labrador

Registrar of Securities, Prince Edward Island 

Dear
Sirs/Mesdames: 

Re: Yamana Gold Inc. (the "Company")  

        Pursuant to Section 8.3 of National Instrument 43-101, this letter is being filed as the consent of Ivan C. Machado, Consultant of
Mineral Processing of TechnoMine Services, LLC to being named in a take-over bid circular of the Company dated September 6, 2006 (the "Circular") and to the inclusion
of reference to the following report (the "Report") and of extracts from or a summary of the Report in the written disclosure contained in the Circular or any other documents incorporated by
reference therein: 

        "São
Vicente Gold Project Mato Grasso State, Brazil — Technical Report pursuant to National Instrument 43-101 of
the Canadian Securities Administrators, dated June 2005." 

        I
hereby confirm that I have read the written disclosure of the Report and extracts from or a summary of the Report contained in the Circular and have no reason to believe that there are
any misrepresentations in the information contained therein that (i) are derived from the Report, or (ii) are within my knowledge as a result of the services performed by the undersigned
in connection with the Report. 

Sincerely,

	
 /s/  IVAN MACHADO      
 Ivan Machado, P. Eng.

Principal

TechnoMine Services, LLCExhibit 4.21  

September 6,
2006 

Yamana
Gold Inc.

Ontario Securities Commission (Principal Regulator)

British Columbia Securities Commission

Alberta Securities Commission

Saskatchewan Securities Commission

The Manitoba Securities Commission

Autorite des Marches Financiers

Office of the Administrator, New Brunswick

Nova Scotia Securities Commission

Securities Commission of Newfoundland and Labrador

Registrar of Securities, Prince Edward Island 

Dear
Sirs/Mesdames: 

Re: Yamana Gold Inc. (the "Company")  

        Pursuant to Section 8.3 of National Instrument 43-101, this letter is being filed as the consent of Michael G. Hester, Vice President
and Principal Mining Engineer, of Independent Mining Consultants, Inc. to being named in a take-over bid circular of the Company dated September 6, 2006
(the "Circular") and to the inclusion of reference to the following reports (the "Reports") and of extracts from or a summary of the Reports in the written disclosure contained in the
Circular or any other documents incorporated by reference therein: 

        "Chapada
Copper-Gold Project, Goias State, Brazil — Technical Report pursuant to National Instrument 43-101 of the
Canadian Administrators, dated February 2004." 

        "Chapada
Copper-Gold Project, Goias State, Brazil, dated August 2004." 

        "Sao
Francisco Technical report for an Open Pit Gravity Concentration and Heap Leach Project in Brazil dated November 2004." 

        "São
Vicente Gold Project Mato Grasso State, Brazil — Technical Report pursuant to National Instrument 43-101 of
the Canadian Securities Administrators, dated June 16, 2005." 

        I
hereby confirm that I have read the written disclosure of the Reports and extracts from or a summary of the Reports contained in the Circular and have no reason to believe that there
are any misrepresentations in the information contained therein that (i) are derived from the Reports or (ii) are within my knowledge as a result of the services performed by the
undersigned in connection with the Reports. 

Sincerely,

	
 /s/  MICHAEL G. HESTER      
 Michael G. Hester

Vice President and Principal Mining Engineer

Independent Mining Consultants, Inc.

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