Document:

EX-4.1

Exhibit 4.1

Consent of Christopher Lee

     I, Christopher Lee, hereby confirm that I have read the Notice of Meeting and Management
Information Circular of Aurora Energy Resources Inc. (“Aurora”) dated March 20, 2009 (the
“Circular”) relating to the special meeting of shareholders of Aurora to approve the amalgamation
of Aurora and 59801 Newfoundland & Labrador Inc., which Circular incorporates by reference the
annual information form of Fronteer Development Group Inc. (“Fronteer”) dated March 27, 2008 for
its 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 Circular or other documents incorporated by reference therein: (i) the
technical report dated August 1, 2007 entitled “Technical Report on the Agi Dagi 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, Part II – CMB Mineral Resources” 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
Fronteer’s mineral properties and mineral resources in the AIF (the “AIF Disclosure”) incorporated
by reference into the Circular. I further consent to the inclusion in the Circular and Fronteer’s
registration statement on Form F-8 relating to the Circular 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 Circular) and of extracts from or a summary of the AIF
Disclosure and the Technical Reports in the 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 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.

	 	 	 	 	 
	 	 	 
	March 20, 2009 	(signed) Christopher Lee
 	 
	 	Christopher Lee, M.Sc., P. GeoEX-4.2

	 	 	 	 	 

Exhibit 4.2

Consent of Ian Cunningham-Dunlop

     I, Ian Cunningham-Dunlop, hereby confirm that I have read the Notice of Meeting and Management
Information Circular of Aurora Energy Resources Inc. (“Aurora”) dated March 20, 2009 (the
“Circular”) relating to the special meeting of shareholders of Aurora to approve the amalgamation
of Aurora and 59801 Newfoundland & Labrador Inc., which Circular incorporates by reference the
annual information form of Fronteer Development Group Inc. (“Fronteer”) dated March 27, 2008 for
its 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 Agi Dagi 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 “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 Christopher Lee (collectively, the “Technical
Reports”). I further consent to the inclusion in the Circular and Fronteer’s registration statement
on Form F-8 relating to the Circular 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 Circular) and of extracts from or a summary of the
Technical Reports in the 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 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.

	 	 	 	 	 
	 	 	 
	March 20, 2009 	(signed) Ian Cunningham-Dunlop
 	 
	 	Ian Cunningham-Dunlop, P.Eng.EX-4.3

	 	 	 	 	 

Exhibit 4.3

Consent of Dr. D.H.C. Wilton

     I, Dr. D.H.C. Wilton, hereby confirm that I have read the Notice of Meeting and Management
Information Circular of Aurora Energy Resources Inc. (“Aurora”) dated March 20, 2009 (the
“Circular”) relating to the special meeting of shareholders of Aurora to approve the amalgamation
of Aurora and 59801 Newfoundland & Labrador Inc., which Circular incorporates by reference the
annual information form of Fronteer Development Group Inc. (“Fronteer”) dated March 27, 2008 for
its 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
“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, Christopher Lee, Mark O’Dea, Jim Lincoln and Ian Cunningham-Dunlop
(collectively, the “Technical Reports”). I further consent to the inclusion in the Circular and
Fronteer’s registration statement on Form F-8 relating to the Circular 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 Circular) and of extracts from
or a summary of the Technical Reports in the 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 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.

	 	 	 	 	 
	 	 	 
	March 20, 2009 	(signed) Dr. D.H.C. Wilton
 	 
	 	Dr. D.H.C. Wilton, P.Geo.EX-4.4

	 	 	 	 	 

Exhibit 4.4

Consent of Gary Giroux

     I, Gary Giroux, hereby confirm that I have read the Notice of Meeting and Management
Information Circular of Aurora Energy Resources Inc. (“Aurora”) dated March 20, 2009 (the
“Circular”) relating to the special meeting of shareholders of Aurora to approve the amalgamation
of Aurora and 59801 Newfoundland & Labrador Inc., which Circular incorporates by reference the
annual information form of Fronteer Development Group Inc. (“Fronteer”) dated March 27, 2008 for
its 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 “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 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 Circular and
Fronteer’s registration statement on Form F-8 relating to the Circular 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 Circular) and of extracts from
or a summary of the Technical Reports in the 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 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.

	 	 	 	 	 
	 	 	 
	March 20, 2009 	(signed) Gary Giroux
 	 
	 	Gary Giroux, P.Eng.

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