Document:

Exhibit 4.2

 

 

April 8, 2010

 

Consent of David Runnels, Eng.

Board of Directors, Osisko Mining Corporation

United States Securities and Exchange Commission

 

To the Board of Directors of Osisko Mining
Corporation

 

I, David Runnels, Eng., of BBA Inc., consent to:

 

1.                                       The
incorporation by reference in the Offer and Circular of Osisko Mining
Corporation (the “Company”), included as part of the Company’s Registration
Statement on Form F-8 as filed with the Securities and Exchange
Commission, of the description of the report titled “Feasibility Study —
Canadian Malartic Project (Malartic, Quebec)” dated December, 2008.

 

2.                                       The information
that forms the summary of the report of the description of project and to the
use of my name under the Offer and Circular and Registration Statement as a
named expert.

 

Dated as of April 8, 2010

 

SIGNED

 

 

	
  /s/
  David Runnels

  	
   

  
	
  David RunnelsExhibit
4.3

 

 

April 13, 2010

 

Consent of B. Terrence Hennessey, P. Geo

Board of Directors, Osisko Mining Corporation

United States Securities and Exchange Commission

 

To the Board of Directors of Osisko Mining
Corporation

 

I, B. Terrence Hennessey, P. Geo, of Micon
International Limited, consent to:

 

1.             The incorporation by
reference in the Offer and Circular of Osisko Mining Corporation (the “Company”),
included as part of the Company’s Registration Statement on Form F-8 as
filed with the Securities and Exchange Commission, of the description of the
report titled “Feasibility Study — Canadian Malartic Project (Malartic, Quebec)”
dated December, 2008.

 

2.             The information that forms
the summary of the report of the description of project and to the use of my
name under the Offer and Circular and Registration Statement as a named expert.

 

	
  Dated
  as of the 13th day of April, 2010

  	
   

  
	
   

  
	
  SIGNED

  	
   

  
	
   

  	
   

  
	
   

  	
   

  
	
  /s/
  B. Terrence Hennessey

  	
   

  
	
  B. Terrence Hennessey

  	
   

  

 

SUITE
900 - 390 BAY STREET, TORONTO ONTARIO, CANADA M5H 2Y2

Telephone
(1) (416) 362-5135 Fax (1) (416) 362 5763Exhibit
4.4

 

	
   399, Montée du Sourire, Rouyn-Noranda, Qc,
  J9X 5L2

  

 

April 13, 2010

 

Consent of Elzéar Belzile, Eng.

Board of Directors, Osisko Mining Corporation

United States Securities and Exchange Commission

 

To the Board of Directors of Osisko Mining Corporation

 

I, Elzéar Belzile, Eng., of BBA Inc., consent to:

 

1.             The incorporation by
reference in the Offer and Circular of Osisko Mining Corporation (the “Company”),
included as part of the Company’s Registration Statement on Form F-8 as
filed with the Securities and Exchange Commission, of the description of the
reports titled “Feasibility Study — Canadian Malartic Project (Malartic,
Quebec)” dated December, 2008 and “Updated resource and reserve estimates for
the  — Canadian Malartic Project
(Malartic, Quebec)” dated March 22, 2010.

 

2.             The information that forms
the summary of the reports of the description of project and to the use of my
name under the Offer and Circular and Registration Statement as a named expert.

 

	
  Dated
  as of the 13th day of April, 2010

  
	
   

  
	
  SIGNED

  
	
   

  
	
   

  
	
  /s/
  Elzéar Belzile

  	
   

  
	
  Elzéar
  BelzileExhibit
4.5

 

 

April 13, 2010

 

Consent of Louis-Pierre Gignac, Eng.

Board of Directors, Osisko Mining Corporation

United States Securities and Exchange Commission

 

To the Board of Directors of Osisko Mining
Corporation

 

I, Louis-Pierre Gignac, Eng., of G Mining Services
Inc., consent to:

 

1.             The incorporation by
reference in the Offer and Circular of Osisko Mining Corporation (the “Company”),
included as part of the Company’s Registration Statement on Form F-8 as
filed with the Securities and Exchange Commission, of the description of the
reports titled “Feasibility Study — Canadian Malartic Project (Malartic,
Quebec)” dated December, 2008 and “Updated resource and reserve estimates for
the  — Canadian Malartic Project
(Malartic, Quebec)” dated March 22, 2010.

 

2.             The information that forms
the summary of the reports of the description of project and to the use of my
name under the Offer and Circular and Registration Statement as a named expert.

 

	
  Dated
  as of the 13th day of April, 2010

  	
   

  
	
   

  	
   

  
	
  SIGNED

  	
   

  
	
   

  	
   

  
	
   

  	
   

  
	
  /s/ Louis-Pierre Gignac, Eng.

  	
   

  
	
  Louis-Pierre
  GignacExhibit
4.6

 

 

April 13, 2010

 

	
  To:

  	
  The
  Board of Directors of Osisko Mining Corporation

  
	
   

  	
   

  
	
  Subject:

  	
  Consent
  of André-Martin Bouchard, P. Eng.

  
	
   

  	
  Board
  of Directors, Osisko Mining Corporation

  
	
   

  	
  United States Securities
  and Exchange Commission

  

 

To the Board of Directors of Osisko Mining
Corporation

 

I, André-Martin Bouchard, P. Eng., of Genivar Income
Fund, consent to:

 

1.             The incorporation by
reference in the Offer and Circular of Osisko Mining Corporation (the “Company”),
included as part of the Company’s Registration Statement on Form F-8 as
filed with the Securities and Exchange Commission, of the description of the
report titled “Feasibility Study — Canadian Malartic Project (Malartic, Quebec)”
dated December, 2008.

 

2.             The information that forms
the summary of the report of the description of project and to the use of my
name under the Offer and Circular and Registration Statement as a named expert.

 

	
  Dated
  as of the 13th day of April, 2010

  
	
   

  
	
  SIGNED

  
	
   

  
	
   

  
	
  /s/
  André-Martin Bouchard

  	
   

  
	
  André-Martin
  Bouchard, P. Eng.

  
	
  Environment
  Director

  

 

	
   

  	
   

  	
  1600,
  René-Lévesque (West) Boulevard, 16th Floor - Montreal, Quebec CANADA H3H 1P9

  Phone.: (514) 340-0046 - Fax: (514) 340-1337 - www.genivar.comExhibit
4.7

 

 

April 13, 2010

 

Consent of Michel R. Julien, Eng., Ph. D.

Board of Directors, Osisko Mining Corporation

United States Securities and Exchange Commission

 

To the Board of Directors of Osisko Mining
Corporation

 

I, Michel R. Julien, Eng., Ph. D. of Golder
Associates Inc., consent to:

 

1.             The incorporation by
reference in the Offer and Circular of Osisko Mining Corporation (the “Company”),
included as part of the Company’s Registration Statement on Form F-8 as
filed with the Securities and Exchange Commission, of the description of the
report titled “Feasibility Study — Canadian Malartic Project (Malartic, Quebec)”
dated December, 2008.

 

2.             The information that forms
the summary of the report of the description of project and to the use of my name
under the Offer and Circular and Registration Statement as a named expert.

 

	
  Dated
  as of the 13th day of April, 2010

  
	
   

  
	
  SIGNED

  
	
   

  
	
   

  
	
  /s/
  Michel R. Julien

  	
   

  
	
  Michel
  R. Julien, Eng. Ph. D

  
	
  PrincipalExhibit
4.8

 

 

April 13, 2010

 

Consent of Richard Gowans, P. Eng.

Board of Directors, Osisko Mining Corporation

United States Securities and Exchange Commission

 

To the Board of Directors of Osisko Mining
Corporation

 

I, Richard Gowans, P. Eng., of Micon International
Limited, consent to:

 

1.                                       The
incorporation by reference in the Offer and Circular of Osisko Mining
Corporation (the “Company”), included as part of the Company’s Registration
Statement on Form F-8 as filed with the Securities and Exchange Commission,
of the description of the report titled “Feasibility Study — Canadian Malartic
Project (Malartic, Quebec)” dated December, 2008.

 

2.                                       The information
that forms the summary of the report of the description of project and to the
use of my name under the Offer and Circular and Registration Statement as a
named expert.

 

	
  Dated
  as of the 13th day of April, 2010

  
	
   

  
	
  SIGNED

  
	
   

  
	
   

  
	
  /s/
  Richard Gowans

  	
   

  
	
  Richard Gowans

  

 

SUITE
900 - 390 BAY STREET, TORONTO ONTARIO, CANADA M5H 2Y2

Telephone
(1) (416) 362-5135 Fax (1) (416) 362 5763Exhibit
4.9

 

 

April 13, 2010

 

Consent of Robert Wares, P. Geo

Board of Directors, Osisko Mining Corporation

United States Securities and Exchange Commission

 

To the Board of Directors of Osisko Mining
Corporation (the “Company”)

 

I, Robert Wares, P. Geo and Chief Operating Officer
of the Company, consent to:

 

1.                                       The
incorporation by reference in the Offer and Circular of the Company, included
as part of the Company’s Registration Statement on Form F-8 as filed with
the Securities and Exchange Commission, of the description of the reports that
were prepared under my direct supervision of certain mineral reserves at
Canadian Malartic Project as at December 2008 and March 2010.

 

2.                                       The information
that forms the summary of the reports of the description of project and other
information pertaining to the Canadian Malartic Project and to the use of my
name under the Offer and Circular and Registration Statement as a named expert.

 

	
  Dated
  as of the 13th day of April, 2010

  
	
   

  
	
  SIGNED

  
	
   

  
	
   

  
	
  /s/
  Robert Wares

  	
   

  
	
  Robert Wares

  

 

1100,
De la Gauchetiére Ouest, bureau 300, Montréal, Québec, Canada H3C 3E4

Téléphone (514) 735-7131 – Télécopieur (514) 933-3290

osisko.comExhibit 4.10

 

CONSENT OF FRASER MILNER
CASGRAIN LLP

 

April 13, 2010

 

We hereby consent to the
reference to our name and opinions contained under the headings “Legal Matters”
and “Certain Canadian Federal Income Tax Considerations” in the Circular
accompanying the Offer dated April 13, 2010 made by Osisko Mining
Corporation to the holders of Common Shares of Brett Resources Inc. included in
the Registration Statement on Form F-8 dated the date hereof relating to
the registration of common shares of Osisko Mining Corporation.

 

	
  /s/
  Fraser Milner Casgrain LLP

  	
   

  
	
  Fraser Milner Casgrain LLP

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