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Re: News Archive - Tuesday, April 15, 2008
Rimfire Options Springfield Gold Project From Jaguar Minerals
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PR08-08

Vancouver, BC -- April 15, 2008: Jason Weber, President and CEO of
Rimfire Minerals Corporation ("Rimfire") is pleased to announce the
Company has reached an agreement with Jaguar Minerals Limited ("Jaguar"
-- ASX Code: JAG) to enter into an option/joint venture arrangement to
explore Jaguar's Springfield gold project in the Lachlan Fold Belt of
New South Wales, Australia. The Springfield gold project lies 12 km
south-southeast of the historic mining town of Gulgong and 80 km to the
northeast of Newcrest's Cadia Valley porphyry copper-gold mining
complex (28.5 Moz gold and 3.8Mt copper). Rimfire's pursuit of the
Springfield project was a result of its Lachlan Fold Belt studies (see
News Release PR06-17, Oct. 3, 2006).

"We look forward to working with Jaguar Minerals in advancing the
Springfield project," states Jason Weber. "There are many reasons why
we are excited to be exploring Springfield not the least of which is a
very high ranking in the BWG Neural Network study."

Highlights of the Springfield project include:

.. The Gulgong area has produced over 500,000 ounces of alluvial gold
from 1872-1927; the source of rich placers have not been adequately
explained by the bedrock mineralization found to date.

.. Gold mineralization found to date at Springfield is hosted in late
Ordovician volcanic rocks which have been intruded by co-magmatic
monzodiorite and monzonite to syenite intrusives, a setting that is
permissive for copper-gold porphyry mineralization of the
Cadia-Ridgeway type.

.. The property hosts the Springfield gold deposit where previous work
(1989-1990) had defined a resource of 1.44 Mt at 1.43 g/t gold (60,000
oz) using a 0.5 g/t cut-off based on 63 shallow drill holes (total 1916
m). The mineralized resource is hosted in altered syenite and was only
delineated to a depth of 60 metres. This resource is quoted for
historical information and should not be treated as a current reserve
or resource. The reader is cautioned that the resource estimate does
not conform to National Instrument 43-101 requirements for reporting
reserves and resources and has not been verified by the issuer's
qualified person and should not be relied upon.

Initially, it has been agreed that Rimfire can earn a 51% interest in
the Project by spending $1,000,000 on exploration over four years.
Following this, the parties will either continue exploration together
under a joint venture agreement, or Jaguar may elect not to contribute,
allowing Rimfire to earn 100% of the project by spending $5 million in
exploration on the Project. Upon definition of a JORC compliant gold
resource of 500,000 oz Jaguar shall be issued 100,000 common shares of
Rimfire Minerals Corporation ("RFM"). Upon definition of a JORC
compliant gold resource of 1M oz Jaguar shall be issued 500,000 common
shares of RFM. Should Rimfire receive cash and/or share payments as a
result of a subsequent option/joint venture with a third party, Jaguar
is entitled to 25% of the proceeds. Should Rimfire decide to sell
outright its interest in the project prior to earning 100% of the
project, Jaguar would receive 40% of all proceeds. If Rimfire
exercises the 100% option and decides to sell any interest, Jaguar
would receive 15% of proceeds.

Lachlan Fold Belt Work Progress: During the past four months, Rimfire
has made good progress on its Lachlan Fold Belt properties. Surface
exploration programs have been undertaken on five (Barmedman, Walmer,
Mt. MacDonald, Goulburn and Gollan) of Rimfire's nine wholly owned
exploration licenses. This work has included geological mapping, rock
chip sampling, soil and silt geochemical surveys and
Induced-Polarization geophysical surveys. These exploration licenses
were selected on the basis of the BWG Neural Network study which
incorporated geological, geophysical (gravity, magnetic and
radiometric), geochemical, lithological, structural, Landsat,
topographical, and drilling databases. Results of this work are being
compiled and evaluated in order to select targets for drilling later in
2008.

This news release has been reviewed by David Caulfield, P.Geo., 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. 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"

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.

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: Jason Weber or David Caulfield

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Copyright (c) 2008 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 Apr 15, 2008 at 8:25:40 AM Pacific Time
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