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Re: News Archive - Monday, August 13, 2007
Drilling Intersects Gold Mineralization in Alaska
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PR07-20

Vancouver, BC -- August 13, 2007: David Caulfield, President and CEO
of Rimfire Minerals Corporation ("Rimfire") is pleased to report that
drilling in the Goodpaster District has intersected a 7.4 metre-wide
gold-bearing zone of quartz veining at the California North target.
Based on this intersection, further drilling is planned this year.

"We are very encouraged that we have a wide, gold-bearing intersection
at the California North target," stated Mark Baknes, VP Exploration for
Rimfire. "Our objective now is to get an accurate measurement of the
vein thickness and orientation by further drilling."

Rubicon Minerals Corporation funded this drilling program (totalling
957 metres) to test four widely spaced targets on the Cal-Surf Property
in the Goodpaster District, Alaska. Exploration in the district is
targeting high grade gold-bearing quartz vein deposits. The Cal-Surf
Property is located approximately 15 kilometres east of the Pogo Gold
Mine.

Hole CN07-01 was drilled to test the California North gold and arsenic
soil geochemical anomaly. Quartz vein mineralization was intersected at
a depth of 72.6 metres and averaged 1.2 g/t gold over a 7.4 metre width
including 2.5 metres averaging 2.2 g/t gold. Extremely fractured core
and poor core recovery did not allow for an accurate measurement of
true vein thickness. At least one additional hole is planned for the
target to determine the true thickness and orientation of the vein.
Drilling is planned to commence in mid-August.

Additional holes were completed at two new targets at the Beverly and
Blue grids and a third at the Boundary Zone, where drilling in 2000 and
2001 intersected high grade gold mineralization in quartz-sulphide
veinlets. These holes returned only low gold +/- bismuth values.

In conjunction with the drilling campaign, groundwork was undertaken at
the Cal-Surf, Eagle and Swede properties, returning anomalous gold and
pathfinder element geochemistry in soil samples that warrant further
investigation.

Rimfire has held key ground in the Goodpaster District since the
discovery of the Pogo Deposit was announced by Teck Cominco in the late
1990's. To date, Rimfire has identified gold targets on four individual
properties on trend and in the vicinity of the Pogo Mine property. In
January of 2007, Rimfire's 182,320 acre land package was optioned to
Evanachan Limited, a private company controlled by ex-Goldcorp Chairman
and CEO Robert McEwen. In a recently completed $22 million transaction,
Rubicon purchased Evanachan's Alaskan holdings, including the option on
Rimfire's properties. Rubicon funded the 2007 program as part of its
option to earn a 60% interest in the group of four properties by
completing $4.8 million in exploration over six years. Rubicon can earn
another 10% by completing a feasibility study and a further 5%, at
Rimfire's election, by providing a project financing loan to be repaid
from Rimfire's free cash flow upon production.

All samples were analyzed by ALS Chemex, North Vancouver, BC, using
ICP-MS and AES analyses for trace element geochemistry and fire assay
for gold. The results contained in this news release have been reviewed
by Mark Baknes, M.Sc., P.Geo., Vice President Exploration, a Qualified
Person under National Instrument 43-101.

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. Rimfire is partnered with
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

"David A. Caulfield"

David A. Caulfield, President

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

TSX-V:RFM
Suite 700 - 700 West Pender St.
Vancouver, B.C. Canada V6C 1G8
T: (604)669-6660 F: (604)669-0898
E-mail: info@rimfire.bc.ca
Web Site: www.rimfireminerals.com
Contact: David Caulfield or Jason Weber

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Copyright (c) 2007 RIMFIRE MINERALS CORPORATION (RFM) All rights
reserved. For more information visit our website at
http://www.rimfire.bc.ca/ or send mailto:info@rimfire.bc.ca
Message sent on Tue Aug 14, 2007 at 5:55:38 AM Pacific Time
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