Inmet and Rimfire Plan Grizzly Exploration

Rimfire Minerals Corporation (TSX VENTURE:RFM) is pleased to report that Rimfire
and Inmet Mining Corporation have signed a formal option agreement pertaining to
a Letter of Intent (see PR08-04, January 31, 2008) granting Inmet an option to
explore the Grizzly Property in northwestern British Columbia. The 2008
exploration program is scheduled to commence in late June. Rimfire, the project
operator, has outlined a two phase program including Induced Polarization (IP)
geophysical surveying, soil geochemical sampling, prospecting and geological
mapping in the first phase. The results of this phase will be used to target
diamond drilling in the second phase program in late summer or early fall.


"Inmet and Rimfire are undertaking a comprehensive examination of the entire
Grizzly property," said Jason Weber, President and CEO of Rimfire Minerals. "We
already have one very compelling target for drilling at the Grizzly Showing, but
we want to cover the rest of the property to see what other targets may be
present prior to drilling later this year."


The Grizzly Property is approximately 50 kilometres east of the Galore Creek
project and within four kilometres of the partially completed Galore Creek
access road. The Grizzly copper-gold porphyry target shows many similarities to
Galore Creek, including its geological setting, volcanic host rock geochemistry,
regional magnetic and gravity geophysical signatures, hydrothermal alteration
and metal signature. Rimfire re-sampled old trenches in 2006. The best result
included 38 metres averaging 0.74% copper and 1.1 g/t gold from a continuous
chip sample. The Grizzly showings occur within a one square kilometre copper,
gold and molybdenum-in-soil geochemical anomaly. A second area of anomalous
copper, gold and molybdenum soil geochemistry (the Mirko Grid) lies
approximately two kilometres northwest.


Under the terms of the agreement, Inmet Mining may earn up to a 60% interest by
funding at least $5 million in exploration at the Grizzly over four years,
including $800,000 in the first year. Inmet Mining Corporation will make staged
cash payments totalling $250,000 over the earn-in period, with $50,000 having
been paid upon signing the letter of intent.


This news release has been reviewed by Mark Baknes, M.Sc., P.Geo., a Qualified
Person for the purpose of National Instrument 43-101.


About Rimfire

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


On behalf of Rimfire Minerals Corporation

Jason Weber, P.Geo., President & CEO