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

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:



--------------------------------------------------------------------
Hem
--------------------------------------------------------------------
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
--------------------------------------------------------------------
Pagisteel
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