Northgate Minerals Extends Mine Life at the Stawell Gold Mine

    Increase in Both Mineral Reserves and Resources

    VANCOUVER, Aug. 6 /CNW/ - (All figures in US dollars except where noted)
- Northgate Minerals Corporation (TSX: NGX, NYSE Amex:   NXG) is pleased to
announce an increase in mineral reserves and resources at its Stawell Gold
Mine located in Victoria, Australia. An aggressive exploration program in
support of resource delineation and conversion has identified approximately
870,000 tonnes of additional mineral reserves containing 93,000 ounces of gold
and has extended the current mine-life until the second quarter of 2012.

                   Mineral Reserve and Resource Highlights

    -   An additional 93,000 ounces of gold reserves have been delineated in
        the first half of 2009
    -   Stawell's mine-life has been extended until Q2-2012
    -   An additional 32,000 indicated ounces and 98,000 inferred ounces have
        been added to the mineral resource base

                     Proven             Probable                Total
    June 30, Tonnes  Grade  Gold  Tonnes  Grade  Gold  Tonnes  Grade  Gold
     2009     (000)  (g/t)(000 oz) (000)  (g/t)(000 oz) (000)  (g/t)(000 oz)
    Open Pit
     than 100m
     surface)     -      -    -      430   1.80     25    430   1.80     25
     than 100m
     surface)    64   7.13   15    2,004   4.24    273  2,068   4.33    288
    Total Proven
     & Probable
     Reserves     15,000 ounces       298,000 ounces        313,000 ounces

    Note: Mineral reserves were estimated using a gold price of A$965/oz;
          cut-off grade applied was variable for underground ore depending
          upon width, mining method and ground conditions; dilution of 2m-3m
          and mining; recovery of 95%-100% was applied to the underground
          reserves, dependent upon mining method.

    Ken Stowe, President and Chief Executive Officer, remarked, "Our
exploration efforts at Stawell continue to delineate new zones of economic
mineralization. In the first six months of the year, we have added another
93,000 ounces to our reserves, bringing the total increase to approximately
230,000 ounces since we acquired the mine less than 18 months ago. Equally as
important, the mine reserve life has also increased to three years. Over the
balance of 2009, we expect to define additional reserves in the newly
discovered GG7 zone, and in the Dukes Flank and North Magdala zones and will
continue to explore the Magdala Upper Levels and GG6 areas, which have great
potential to host additional reserves and resources. Overall, prospects are
excellent for us to add substantially to the nearly 2.0 million ounces of gold
produced at Stawell over the 26-year history of the mine."

    Overview of Mineral Reserve and Resource Additions

    Mineral reserves and resources were increased in all areas of the mine
through a combination of exploration drilling, resource definition drilling,
and grade control drilling. In the first six months of 2009, a total of
870,000 tonnes containing 93,000 ounces of additional gold reserves were
delineated and 48,000 ounces were depleted as a result of mining activity. The
result is a net increase of 51,000 ounces of reserves compared with
Northgate's December 31, 2008 reserve statement. A further 32,000 ounces of
indicated and 98,000 ounces of inferred resources have also been added.
Mineral resources, exclusive of reserves, at June 30, 2009 are outlined in the
following table:

                           Indicated                      Inferred
    June 30,        Tonnes     Grade     Gold     Tonnes     Grade     Gold
     2009            (000)     (g/t)   (000 oz)    (000)     (g/t)   (000 oz)
    Open Pit
     (less than
     100m from
     surface)       2,975      2.19       209       205      2.64       17
     than 100m
     surface)         388      4.68        58       843      5.57      151
    Total Resources  267,000 indicated ounces      168,000 inferred ounces

    Note: Mineral Resources were estimated using the following parameters:
          a. Gold price of A$1,071/oz for underground resources
          b. Magdala surface above 130mRL and above a nominal 0.8g/t gold
          c. Wonga surface at A$1,071/oz gold price

    Continuation of the 2009 Exploration Program

    The balance of the 2009 exploration program at Stawell will focus on the
newly discovered GG7 (an extension to the GG5L system), Dukes Flank and North
Magdala zones, in addition to ongoing work in the Magdala Upper Levels and GG6
areas (refer to Figure 1 below) where definition and exploration drilling will
be carried out in support of resource conversion and further mine-life

    Figure 1 - Stawell Gold Mine Long Section

    Note to Mineral Reserves and Resources:

    1.  All Mineral Reserves and Resources have been estimated in accordance
        with the JORC Code and have been reconciled to CIM Standards as
        prescribed by National Instrument 43-101.
    2.  Mineral Resources are exclusive of Mineral Reserves.
    3.  Mineral Reserve estimates were prepared by Glenn Miller, Mine
        Technical Superintendent, Northgate Minerals Corporation. Mr. Miller
        is a member of the Australasian Institute of Mining and Metallurgy
        and has over 16 years of relevant engineering experience and is a
        Qualified Person.
    4.  Mineral Resource estimates were prepared by Mark Haydon, Geology
        Manager, Northgate Minerals Corporation. Mr. Haydon is a member of
        the Australasian Institute of Geoscientists and has over 15 years of
        relevant geological experience and is a Qualified Person.
    5.  Mineral Reserves and Mineral Resources are rounded to 1,000 tonnes,
        0.01 g/t gold and 1,000 ounces. Minor discrepancies in summations may
        occur due to rounding.

    The terms "Qualified Person", "Mineral Reserve", "Proven Mineral
Reserve", "Probable Mineral Reserve", "Mineral Resource", "Measured Mineral
Resource", "Indicated Mineral Resource", and "Inferred Mineral Resource" used
in this news release are defined in accordance with NI 43-101-Standards of
Disclosure for Mineral Projects of the Canadian Securities Administrators.

    Northgate Minerals Corporation is a gold and copper producer with mining
operations, development projects and exploration properties in Canada and
Australia. The company is forecasting record gold production of over 390,000
ounces in 2009 and is targeting growth through further acquisition
opportunities in stable mining jurisdictions around the world. Northgate is
listed on the TSX under the symbol NGX and on the NYSE Amex under the symbol

    Forward-Looking Statements:

    This Northgate press release contains "forward-looking information", as
such term is defined in applicable Canadian securities legislation, concerning
Northgate's future financial or operating performance and other statements
that express management's expectations or estimates of future developments,
circumstances or results. Generally, forward-looking information can be
identified by the use of forward-looking terminology such as "expects",
"believes", "anticipates", "budget", "scheduled", "estimates", "forecasts",
"intends", "plans" and variations of such words and phrases, or by statements
that certain actions, events or results "may", "will", "could", "would" or
"might" "be taken", "occur" or "be achieved". Forward-looking information is
based on a number of assumptions and estimates that, while considered
reasonable by management based on the business and markets in which Northgate
operates, are inherently subject to significant operational, economic and
competitive uncertainties and contingencies. Northgate cautions that
forward-looking information involves known and unknown risks, uncertainties
and other factors that may cause Northgate's actual results, performance or
achievements to be materially different from those expressed or implied by
such information, including, but not limited to gold and copper price
volatility; fluctuations in foreign exchange rates and interest rates; the
impact of any hedging activities; discrepancies between actual and estimated
production, between actual and estimated reserves and resources or between
actual and estimated metallurgical recoveries; costs of production; capital
expenditure requirements; the costs and timing of construction and development
of new deposits; and the success of exploration and permitting activities. In
addition, the factors described or referred to in the section entitled "Risk
Factors" in Northgate's Annual Information Form for the year ended December
31, 2008 or under the heading "Risks and Uncertainties" in Northgate's 2008
Annual Report, both of which are available on the SEDAR website at, should be reviewed in conjunction with the information found in
this press release. Although Northgate has attempted to identify important
factors that could cause actual results, performance or achievements to differ
materially from those contained in forward-looking information, there can be
other factors that cause results, performance or achievements not to be as
anticipated, estimated or intended. There can be no assurance that such
information will prove to be accurate or that management's expectations or
estimates of future developments, circumstances or results will materialize.
Accordingly, readers should not place undue reliance on forward-looking
information. The forward-looking information in this press release is made as
of the date of this press release, and Northgate disclaims any intention or
obligation to update or revise such information, except as required by
applicable law.

For further information:

For further information: Ms. Keren R. Yun, Director, Investor Relations,
Tel: (416) 363-1701 ext. 233, Email:, Website:

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