Document:

exv4w1

Exhibit 4.1

Consent of Christopher Lee

     I, Christopher Lee, hereby confirm that I have read the Offer and Circular of Fronteer
Development Group Inc. (the “Company”) furnished with the Company’s offer dated January 23, 2009 to
purchase all of the issued and outstanding common shares of Aurora Energy Resources Inc., which
Offer and Circular incorporates by reference the Company’s annual information form dated March 27,
2008 for the year ended December 31, 2007 (the “AIF”).

     I hereby consent to the use of my name and being identified as a “qualified person” in
connection with references to (a) my preparation or involvement in the preparation of the following
technical reports in the Offer and Circular or other documents incorporated by reference therein:
(i) the technical report dated August 1, 2007 entitled “Technical Report on the Aði Daði Gold
Property, Çanakkale Province, Turkey” prepared together with Ian Cunningham-Dunlop, (ii) the
technical report dated August 1, 2007 entitled “Technical Report on the Kirazli Gold Property,
Çanakkale Province, Republic of Turkey” prepared together with Ian Cunningham-Dunlop, (iii) the
technical report dated April 7, 2008 and amended on August 28, 2008 entitled “An Update on the
Exploration Activities of Aurora Energy Resources Inc. on the CMB Uranium Property, Labrador,
Canada, During the Period January 1, 2007 to December 31, 2007” prepared together with Ian
Cunningham-Dunlop, (iv) the amended technical report dated November 20, 2007 entitled “An Update on
the Exploration Activities of Aurora Energy Resources Inc. on the CMB Uranium Property, Labrador,
Canada, During the Period January 1, 2007 to October 31, 2007” prepared together with Gary Giroux,
Dr. D.H.C. Wilton, Mark O’Dea, Jim Lincoln and Ian Cunningham-Dunlop and (v) the technical report
dated July 28, 2008, as amended August 8, 2008, entitled “Technical Report on the Northumberland
Project, Nye County, Nevada, USA” prepared together with Jim Ashton (collectively, the “Technical
Reports”) and (b) my preparation or involvement in the preparation of the disclosure concerning the
Company’s mineral properties and mineral resources in the AIF (the “AIF Disclosure”) incorporated
by reference into the Offer and Circular. I further consent to the inclusion in the Offer and
Circular and the registration statement on Form F-8 filed with the United States Securities and
Exchange Commission (the “Registration Statement”) of the AIF Disclosure and the Technical Reports
(through the inclusion by way of incorporation by reference of the AIF and any other documents
incorporated by reference in the Offer and Circular) and of extracts from or a summary of the AIF
Disclosure and the Technical Reports in the Offer and Circular and the Registration Statement or
any documents incorporated by reference therein.

     I also hereby confirm that I have read the AIF and the Technical Reports and extracts from or
a summary of the AIF Disclosure and the Technical Reports contained in the Offer and Circular and
the Registration Statement by way of incorporation by reference of the AIF and any other documents
incorporated by reference and that I have no reason to believe there are any misrepresentations in
the information contained therein that is derived from the AIF Disclosure or the Technical Reports
or that is within my knowledge as a result of the services that I have performed in connection with
the AIF Disclosure and the Technical Reports.

	 	 	 	 	 
	 	 	 
	January 23, 2009 	  	(signed) Christopher Lee
 	 
	 	 	Christopher Lee, M.Sc., P.Geoexv4w2

Exhibit 4.2

Consent of Ian Cunningham-Dunlop

     I, Ian Cunningham-Dunlop, hereby confirm that I have read the Offer and Circular of Fronteer
Development Group Inc. (the “Company”) furnished with the Company’s offer dated January 23, 2009 to
purchase all of the issued and outstanding common shares of Aurora Energy Resources Inc., which
Offer and Circular incorporates by reference the Company’s annual information form dated March 27,
2008 for the year ended December 31, 2007 (the “AIF”).

     I hereby consent to the use of my name in connection with references to my preparation or
involvement in the preparation of the following technical reports in the AIF or other documents
incorporated by reference therein: (i) the technical report dated August 1, 2007 entitled
“Technical Report on the Aði Daði Gold Property, Çanakkale Province, Turkey” prepared together with
Christopher Lee, (ii) the technical report dated August 1, 2007 entitled “Technical Report on the
Kirazli Gold Property, Çanakkale Province, Republic of Turkey” prepared together with Christopher
Lee, and (iii) the amended technical report dated November 20, 2007 entitled “The Exploration
Activities of Aurora Energy Resources Inc. on the CMB Uranium Property, Labrador, Canada, During
the Period January 1, 2007 to December 31, 2007” prepared together with Gary Giroux, Dr. D.H.C.
Wilton, Mark O’Dea, Jim Lincoln and Christopher Lee (collectively, the “Technical Reports”). I
further consent to the inclusion in the Offer and Circular and the registration statement on Form
F-8 filed with the United States Securities and Exchange Commission (the “Registration Statement”)
of the Technical Reports (through the inclusion by way of incorporation by reference of the AIF in
the Offer and Circular) and of extracts from or a summary of the Technical Reports in the Offer and
Circular and the Registration Statement or any documents incorporated by reference therein.

     I also hereby confirm that I have read the Technical Reports and extracts from or a summary of
the Technical Reports contained in the Offer and Circular and the Registration Statement by way of
incorporation by reference of the AIF and that I have no reason to believe there are any
misrepresentations in the information contained therein that is derived from the Technical Reports
or that is within my knowledge as a result of the services that I have performed in connection with
the Technical Reports.

	 	 	 	 	 
	 	 	 
	January 23, 2009 	  	(signed) Ian Cunningham-Dunlop
 	 
	 	 	Ian Cunningham-Dunlop, P.Eng.exv4w3

Exhibit 4.3

Consent of Dr. D.H.C. Wilton

     I, Dr. D.H.C. Wilton, hereby confirm that I have read the Offer and Circular of Fronteer
Development Group Inc. (the “Company”) furnished with the Company’s offer dated January 23, 2009 to
purchase all of the issued and outstanding common shares of Aurora Energy Resources Inc., which
Offer and Circular incorporates by reference the Company’s annual information form dated March 27,
2008 for the year ended December 31, 2007 (the “AIF”).

     I hereby consent to the use of my name in connection with references to my preparation or
involvement in the preparation of the following technical reports in the AIF or other documents
incorporated by reference therein: (i) the technical report dated February 19, 2007 as amended
March 1, 2007 entitled “The Exploration Activities of Aurora Energy Resources Inc. on the CMB
Uranium Property, Labrador, Canada During the Period January 2006 to January 2007” prepared
together with Gary Giroux, and (ii) the amended technical report dated November 20, 2007 entitled
“The Exploration Activities of Aurora Energy Resources Inc. on the CMB Uranium Property, Labrador,
Canada, During the Period January 1, 2007 to December 31, 2007” prepared together with Gary Giroux,
Christopher Lee, Mark O’Dea, Jim Lincoln and Ian Cunningham-Dunlop (collectively, the “Technical
Reports”). I further consent to the inclusion in the Offer and Circular and the registration
statement on Form F-8 filed with the United States Securities and Exchange Commission (the
“Registration Statement”) of the Technical Reports (through the inclusion by way of incorporation
by reference of the AIF in the Offer and Circular) and of extracts from or a summary of the
Technical Reports in the Offer and Circular and the Registration Statement or any documents
incorporated by reference therein.

     I also hereby confirm that I have read the Technical Reports and extracts from or a summary of
the Technical Reports contained in the Offer and Circular and the Registration Statement by way of
incorporation by reference of the AIF and that I have no reason to believe there are any
misrepresentations in the information contained therein that is derived from the Technical Reports
or that is within my knowledge as a result of the services that I have performed in connection with
the Technical Reports.

	 	 	 	 	 
	 	 	 
	January 23, 2009 	  	(signed) Dr. D.H.C. Wilton
 	 
	 	 	Dr. D.H.C. Wilton, P.Geo.exv4w4

Exhibit 4.4

Consent of Gary Giroux

     I, Gary Giroux, hereby confirm that I have read the Offer and Circular of Fronteer Development
Group Inc. (the “Company”) furnished with the Company’s offer dated January 23, 2009 to purchase
all of the issued and outstanding common shares of Aurora Energy Resources Inc., which Offer and
Circular incorporates by reference the Company’s annual information form dated March 27, 2008 for
the year ended December 31, 2007 (the “AIF”).

     I hereby consent to the use of my name in connection with references to my preparation or
involvement in the preparation of the following technical reports in the AIF or other documents
incorporated by reference therein: (i) the technical report dated February 19, 2007 as amended
March 1, 2007 entitled “The Exploration Activities of Aurora Energy Resources Inc. on the CMB
Uranium Property, Labrador, Canada During the Period January 2006 to January 2007” prepared
together with Dr. D.H.C. Wilton, and (ii) the amended technical report dated November 20, 2007
entitled “The Exploration Activities of Aurora Energy Resources Inc. on the CMB Uranium Property,
Labrador, Canada, During the Period January 1, 2007 to December 31, 2007” prepared together with
Christopher Lee, Dr. D.H.C. Wilton, Mark O’Dea, Jim Lincoln and Ian Cunningham-Dunlop
(collectively, the “Technical Reports”). I further consent to the inclusion in the Offer and
Circular and the registration statement on Form F-8 filed with the United States Securities and
Exchange Commission (the “Registration Statement”) of the Technical Reports (through the inclusion
by way of incorporation by reference of the AIF in the Offer and Circular) and of extracts from or
a summary of the Technical Reports in the Offer and Circular and the Registration Statement or any
documents incorporated by reference therein.

     I also hereby confirm that I have read the Technical Reports and extracts from or a summary of
the Technical Reports contained in the Offer and Circular and the Registration Statement by way of
incorporation by reference of the AIF and that I have no reason to believe there are any
misrepresentations in the information contained therein that is derived from the Technical Reports
or that is within my knowledge as a result of the services that I have performed in connection with
the Technical Reports.

	 	 	 	 	 
	 	 	 
	January 23, 2009 	  	(signed) Gary Giroux
 	 
	 	 	Gary Giroux, P.Eng.

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