MacArthur Copper Project Quaterra Alaska Inc.

22.0   DATE AND SIGNATURE PAGE

John W. Rozelle, P.G.
Principal Geologist

TETRA TECH MM, INC.

350 Indiana Street, Suite 500
Golden, Colorado 80401
Telephone: 303-217-5700
Facsimile: 303-217-5705
Email: john.rozelle@tetratech.com

CERTIFICATE of AUTHOR

I, John W. Rozelle, P.G., do hereby certify that:

1. I am currently employed by Tetra Tech MM, Inc. at:

350 Indiana Street

Suite 500

Golden, Colorado 80401

2.	I graduated with a degree in Geology (BA.) from the State University of New York at Plattsburg, New York in 1976. In addition, I graduated from the Colorado School of Mines, Golden, Colorado with a graduate degree in Geochemistry (M.Sc.) in 1978.
3.	I am a Member of the American Institute of Professional Geologists (CPG-07216), a register Geologist in the State of Wyoming (PG-337), a member of Society for Mining, Metallurgy, and Exploration, Inc. (SME) and the Society of Economic Geologists.
4.	I have worked as a geologist for a total of thirty years since my graduation from university; as a graduate student, as an employee of a major mining company, and as a consultant for more than 27 years.
5.	I have read the definition of “qualified person” set out in National Instrument 43-101 (“NI 43- 101”) and certify that by reason of my education, affiliation with a professional association (as defined in NI 43-101) and past relevant work experience, I fulfill the requirements to be a “qualified person” for the purposes of NI 43-101.
6.	I am responsible for the preparation of the technical report titled “MacArthur Copper Project, NI 43-101 Technical Report, Lyon County, Nevada, U.S.A.” and dated 17 February 2009 (the “Technical Report”). I have visited the subject properties between September 29, 2008 and October 1, 2008.
7.	I have either supervised the data collection, preparation, and analysis and/or personally completed an independent review and analysis of the data and written information contained in this Technical Report.

Tetra Tech February 2009 117