RFM Rimfire Minerals Corp Com Npv

Rimfire Minerals Corporation ("Rimfire") (TSX VENTURE:RFM) is pleased to
announce the discovery of gold mineralization made during a trenching program
conducted with partner Northgate Minerals Corporation at the Boulevard Property
in Yukon Territory. The Boulevard Property is located approximately 135
kilometres south of Dawson City, Yukon. Gold bearing mineralization, including
7.04 g/t gold over 6.0 metres, was encountered in two of three trenches spaced
300 metres apart. A 1000 metre diamond drilling program to test this new
discovery will commence September 1 of this year.


Chip sampling from the first trench (TRBV08-01) yielded 7.04 g/t gold over 6.0
metres. One hundred metres southeast, trench TRBV08-02 returned 6.43 g/t gold
over 2.0 metres. A third trench located 200 metres northwest of trench TRBV08-01
appears to have been located off trend. Gold mineralization is hosted in
strongly sericite-clay altered schists with disseminated pyrite, arsenopyrite,
stibnite and specular hematite that envelopes quartz and massive stibnite veins.
The work program, completed in July, targeted anomalous arsenic-antimony-gold
soil geochemistry. Additional soil sampling undertaken in conjunction with
trenching has now expanded the target to an area of 2.0 by 0.4 kilometres.


"This mineralization doesn't outcrop. It is a blind discovery that is the result
of solid execution of classic grassroots exploration techniques," stated Jason
Weber, President and CEO of Rimfire Minerals. "Together with Northgate, we have
advanced the Boulevard from concept to discovery and we now look forward to the
September drill program where we will test the extent of this mineralization."


This program was conducted under an Exploration Alliance with Northgate signed
in December, 2005. This alliance targeted "Pogo-style" intrusion-related gold
deposits in an area fitting the model criteria and possessing placer gold
deposits without a known bedrock source. The Boulevard area was selected from a
much larger regional compilation and reconnaissance silt sampling program that
led to the identification of anomalous gold and pathfinder elements in creeks
draining the Boulevard. Detailed soil sampling in 2007 outlined the
multi-element geochemical anomaly that was the focus of the recent trenching
program.


In light of these positive results, Rimfire and Northgate have added 96 claim
units to the property and a follow up program is planned for early September.
This program will consist primarily of diamond drilling with four to six holes
(averaging 150 metres in length) to test the continuity of the mineralization at
depth and on strike. Prior to drilling, reconnaissance IP geophysical survey
lines will be completed to determine if IP will be an effective targeting tool.
As well, auger soil sampling will be conducted over certain portions of the
existing grid to recover higher quality samples from areas where permafrost and
an ash layer have masked soil geochemical response.


The Boulevard Property is held jointly by Rimfire and Northgate, with each
company having funded the initial $330,000 in exploration that led to staking of
the property. To date, Northgate is has funded approximately $435,000 of the
required $1.5 million in exploration expenditures to earn an additional 10%
interest (for a total of 60%) in the property.


This news release has been reviewed by Mark Baknes, M.Sc., P.Geo., VP
Exploration of Rimfire Minerals, a Qualified Person for the purpose of 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 copper properties in
western North America and Australia. Rimfire currently has in excess of two
years of operating capital, and finances approximately 80% of its exploration
through option and joint venture agreements. Current and former partners include
AngloGold Ashanti Limited, Barrick Gold Corporation, Newmont Mining Company,
Inmet Mining Corporation, Northgate Minerals Corporation, Fronteer Development
Group Inc., Rubicon Minerals Corporation, American Creek Resources Ltd., Island
Arc Exploration Corporation, Jaguar Minerals Limited and BWG.


On behalf of Rimfire Minerals Corporation

Jason Weber, P.Geo., President & CEO

CAUTIONARY STATEMENT: No stock exchange, securities commission or other
regulatory authority has approved or disapproved the information contained
herein. This News Release includes certain "forward-looking statements". Other
than statements of historical fact, all statements included in this release,
including, without limitation, statements regarding future plans and objectives
of Rimfire Minerals Corporation, are forward-looking statements that involve
various risks and uncertainties. There can be no assurance that such statements
will prove to be accurate, and actual results and future events could differ
materially from those anticipated in such statements. Important factors that
could cause actual results to differ materially from Rimfire's expectations are
the risks detailed herein and from time to time in the filings made by Rimfire
Minerals Corporation with securities regulators. Those filings can be found on
the Internet at http://www.sedar.com and
http://www.sec.gov/edgar/searchedgar/companysearch.html.

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