Rimfire Minerals Corporation

Rimfire Minerals Corporation

January 17, 2008 10:43 ET

Rimfire Minerals Corporation: Additional Copper-Gold Results From Wernecke Breccia JV Drilling

VANCOUVER, BRITISH COLUMBIA--(Marketwire - Jan. 17, 2008) - Jason Weber, President and CEO of Rimfire Minerals Corporation (TSX VENTURE:RFM) reports additional results from drilling at the Hem and Pagisteel Fault prospects of the Wernecke Breccias Project, a joint venture with Fronteer Development Group Inc. Exploration conducted throughout the 2007 field season targeted iron oxide copper-gold-uranium targets and stand-alone uranium targets on the Joint Venture's 373-sq-km land package in the Wernecke Mountains of Canada's north-central Yukon Territory.

Highlights from the Pagisteel Fault and HEM prospects are:

- 2.57% copper and 0.97 grams per tonne gold over 6.10 metres in PG07-01 at the Pagisteel Fault.

- 0.69% copper and 0.17 grams per tonne gold over 9.33 metres in UT07-11 at HEM.

- 0.36% copper and 0.18 grams per tonne gold over 8.37 metres in UT07-12 at HEM.

Hole PG07-01 is the first to test a regional fault structure associated with a 4-km long trend of soil and rock geochemistry anomalous in gold and copper at the Pagisteel Fault Prospect. This hole intersected several faulted zones interleaved with sections of metasomatized sedimentary rock with locally disseminated to semi-massive chalcopyrite and pyrite.

At Hem, two holes spaced 200 metres apart were drilled to test a broad low-grade copper intersection encountered by previous workers in 1995 drilling. The holes cut variably (silica-potassium-feldspar-hematite) altered siltstone and potassium feldspar-albite-chlorite-sericite altered Wernecke breccia and zones of specularite-carbonate-magnetite-chalcopyrite veining.

Final 2007 drill results returned include:

Hole # From (m) To (m) Interval (m) Au (ppm) Cu (%)
less than
UT07-11 175.87 176.36 0.49 0.005 1.59
UT07-11 332.50 341.04 8.54 0.136 0.20
UT07-11 345.28 354.61 9.33 0.173 0.69
Incl. 345.98 349.63 3.65 0.353 1.46

UT07-12 149.84 158.21 8.37 0.180 0.36
UT07-12 178.40 191.45 13.05 0.035 0.28
PG07-01 117.30 123.40 6.10 0.966 2.57
True widths for the intersections above are estimated to be 80% of the
indicated lengths for Hem drill holes and 90% for the Pagisteel drill hole.

Maps showing the Pagisteel Fault drill hole location and soil geochemical results and Hem drill hole locations and ground magnetics geophysical results can be found at http://www.rimfire.bc.ca/s/Wernecke_Breccias.asp.

The 2007 Wernecke Breccias exploration program was operated by Fronteer, and funded pro-rata by Fronteer (80%) and Rimfire (20%). Remaining results from the 2007 program will be released once the data has been compiled.

Assay results have been prepared under the guidance of David Kuran, P. Geo, who is designated as a Qualified Person with the ability and authority to verify the authenticity of and validity of this data. All samples were analyzed by ALS Chemex, North Vancouver, BC, using ICP-AES and fire assay. Assays were completed with uranium determinations by ME-MS-61 ICP geochemical analysis with samples returning over 1000 ppm U were then analyzed by U-XRF-10 analysis.

About Rimfire

Rimfire Minerals Corporation is an aggressive, well-financed mineral exploration company with a portfolio of highly prospective gold and silver properties in western North America. Current and former partners include AngloGold Ashanti Limited, Barrick Gold Corporation, Newmont Mining Company, Northgate Minerals Corporation, Fronteer Development Group, Rubicon Minerals Corporation, Cangold Limited, American Creek Resources Ltd., Island Arc Exploration Corporation, Arcus Development Group Inc. and BWG.

On behalf of Rimfire Minerals Corporation

Jason Weber, P.Geo., President & CEO

The TSX Venture Exchange has not reviewed and does not accept responsibility for the adequacy or accuracy of this release.

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