Rimfire and Northgate Commence Drilling at Boulevard, Yukon

    VANCOUVER, Sept. 23 /CNW/ - (All figures in Canadian dollars) Rimfire
Minerals Corporation, TSX-V:RFM, is pleased to announce that in partnership
with Northgate Minerals Corporation, TSX:NGX, drilling has commenced at its
new gold discovery on the Boulevard Property. 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 discovered in two
of three trenches over a 300 metre trend (see Rimfire news release PR08-12,
August 20, 2008). The diamond drilling program will consist of 4 to 6 holes
averaging 150 metres in length and is expected to be completed by mid-October.
    The current program was initiated after this summer's discovery of
gold-bearing mineralization in trenches testing anomalous
arsenic-antimony-gold soil geochemistry at the Boulevard. 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. 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. Additional soil sampling
undertaken in conjunction with trenching has now expanded the target to an
area of 2.0 by 0.4 kilometres. Drilling will aim to test mineralization
encountered in the trenches at depth. Soil sampling and a reconnaissance IP
geophysical survey has commenced to help expand the target, as well as refine
drill hole locations along trend.
    This program is being conducted under an exploration alliance agreement
with Northgate Minerals signed in December, 2005. The Boulevard Property is
held jointly by Rimfire and Northgate, with each company having funded the
initial $330,000 in targeting and exploration that led to staking of the
property. To date, Northgate 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.

    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.

    Northgate Minerals Corporation is a mid-tier gold and copper producer
with mining operations, development projects and exploration properties in
Canada and Australia. The company is forecasting 385,000 ounces of unhedged
gold production in 2008 and is targeting growth through further acquisitions
in stable mining jurisdictions around the world. Northgate is listed on the
Toronto Stock Exchange under the symbol NGX and on the American Stock Exchange
under the symbol NXG.

    Forward-Looking Statements:

    This news release contains certain "forward-looking statements" and
"forward-looking information" under applicable Canadian and U.S. securities
laws. Forward-looking statements generally can be identified by the use of
forward-looking terminology such as "may," "will," "expect," "intend,"
"estimate," "anticipate," "believe," or "continue" or the negative thereof or
variations thereon or similar terminology. Forward-looking statements are
necessarily based on a number of estimates and assumptions that are inherently
subject to significant business, economic and competitive uncertainties and
contingencies. Certain of the statements made herein, including any
information as to the future activities of and developments related to the
business activities of Northgate Minerals Corporation (Northgate) and its
subsidiaries, the market position, and future financial or operating
performance of Northgate, are forward-looking and subject to important risk
factors and uncertainties, many of which are beyond the corporations' ability
to control or predict. Known and unknown factors could cause actual results to
differ materially from those projected in the forward-looking statements. Such
factors include, among others: gold price volatility; impact of any hedging
activities, including margin limits and margin calls; discrepancies between
actual and estimated production, between actual and estimated reserves and
resources and between actual and estimated metallurgical recoveries; costs of
production, capital expenditures, costs and timing of construction and the
development of new deposits, success of exploration activities and permitting
time lines; changes in national and local government legislation, taxation,
controls, regulations and political or economic developments in any of the
countries in which either corporation does or may carry out business in the
future; risks of sovereign investment; the speculative nature of gold
exploration, development and mining, including the risks of obtaining
necessary licenses and permits; dilution; competition; loss of key employees;
additional funding requirements; and defective title to mineral claims or
property. In addition, there are risks and hazards associated with the
business of gold exploration, development and mining, including environmental
hazards, industrial accidents, unusual or unexpected formations, pressures,
cave-ins, flooding and gold bullion losses (and the risk of inadequate
insurance or inability to obtain insurance, to cover these risks), as well as
the factors described or referred to in the section entitled "Risk Factors" in
Northgate's Annual Information Form for the year ended December 31, 2006 or
under the heading "Risks and Uncertainties" in Northgate's 2006 annual report,
both of which are available on SEDAR at www.sedar.com, and which should be
reviewed in conjunction with this document. Accordingly, readers should not
place undue reliance on forward-looking statements. Neither corporation
undertakes any obligation to update publicly or release any revisions to
forward-looking statements to reflect events or circumstances after the date
of this document or to reflect the occurrence of unanticipated events, except
in each case as required by law.

For further information:

For further information: Ms. Keren R. Yun, Director, Investor Relations,
Tel: (416) 216-2781, Email: ngx@northgateminerals.com, Website:

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