Northgate Minerals Discovers High Grade Mineralization in a Previously Untested Area at its Stawell Gold Mine
2010年11月2日 - 7:15AM
PR Newswire (Canada)
VANCOUVER, Nov. 1 /CNW/ -- Hole SD649A Intersects 13.7 Grams per
Tonne over 5.45 Metres and 15.4 Grams per Tonne over 2.5 Metres
VANCOUVER, Nov. 1 /CNW/ - Northgate Minerals Corporation (TSX: NGX,
NYSE Amex: NXG) is pleased to report that surface diamond drilling
at its Stawell Gold Mine has intersected high grade gold
mineralization approximately 1.6 kilometres ("km") south of the
existing mine workings. Hole SD649A Highlights - Hole SD649A
intersected multiple gold bearing intervals which include: - 13.7
grams per tonne ("g/t") gold over 5.45 metres ("m"), including 25.0
g/t gold over 2.2 m; and, - 15.4 g/t gold over 2.5 m. - The
mineralization is consistent with the Stawell Golden Gift style ore
zones, which in total have produced over 600,000 ounces of gold
during the past decade. - The drill intersections are several
hundred metres above the GG6 zone that is currently being mined and
the nearest drilling is 440 m to the north and 360 m to the south
of the current intersections. Ken Stowe, President and Chief
Executive Officer, remarked, "The three holes drilled so far in
this part of the property have confirmed the presence of a gold
bearing basalt dome, which is the key geologic feature at Stawell.
If the follow-up drilling over the next nine months outlines a
broad enough zone of mineralization, the area is sufficiently close
to existing infrastructure that it could be drilled off and
conceivably brought into production within the next two to three
years. Exploration at Stawell in the coming months will be
particularly exciting as we follow up on hole SD649A, as well as
the recently announced Northgate Gift discovery." 2010 Diamond
Drill Program Magneto telluric ("MT") geophysical surveys were
conducted in late 2009 over the southern part of the Stawell mining
lease between the historic Wonga surface deposits and the current
underground Magdala and Golden Gift orebodies. The MT surveys
defined what appeared to be the margin of a basalt body at depth,
representing a continuation of the Golden Gift dome to the south of
the current mine area. The 2010 diamond drilling program in the
southern part of the Stawell Mine Lease was designed to confirm the
presence of the Golden Gift basalt dome in this area and test for
the presence of gold mineralization, which is associated with
basalt domes in other areas of the property. The first hole in the
program, SD648, was collared 100 m north of the Wonga Pit and
intersected 1.4 g/t gold over 2.9 m on the eastern flank of the
Golden Gift basalt dome. While the intercept was not economically
significant, the host sediments closely resembled those of the
Albion Formation, which hosts the Magdala and Golden Gift
orebodies. A daughter hole, SD648W1, was drilled with no
significant result. Hole SD649A was then collared 270 m northwest
of hole SD648 and intercepted a strongly mineralized zone at
1,157.8 m below surface, which has a down dip projection of 120 m
to the Wildcat Porphyry (a post mineralization structure that
offsets the Magdala and Golden Gift deposits). The hole contains
multiple intercepts (see table 1), the most significant of which
are 13.7 g/t over 5.45 m and 15.4 g/t over 2.5 m. The zone remains
open up dip and mineralization remains untested up to 440 m north
and 360 m to the south of the current intersections. The nearest
underground workings are approximately 1.6 km to the north at a
depth of approximately 870 m. Overview of Stawell Gold Mine Magdala
& Gift Area The dominant geological feature at Stawell is the
1.2 km wide Magdala basalt volcanic dome surrounded by gold-bearing
sedimentary formations. Historical and current mining occurs in
four distinct settings: iron-rich sediments stratigraphically above
the basalt (basalt flank); at the sediment-basalt contact; areas of
sediment bounded by basalt (locally termed "waterloos"); and, in
quartz lode shear structures paralleling the plunge and dip of the
basalt dome. Later stage intrusion style gold also occurs and was
historically mined at the Wonga underground and open pit
operations. Figure 1 illustrates a longitudinal view of the current
reserves and the location of Hole SD649A. Figure 1 - Stawell Gold
Mine Longitudinal Projection
www.northgateminerals.com/Theme/Northgate/files/Releases/Fig1STG.gif
Table 1: Assay Results from Hole SD649A
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Gold Mineralisation Hole ID From (m) To (m) Interval (m) Assay
(g/t) Style
-------------------------------------------------------------------------
SD649A 1240.7 1243.5 2.8 2.5 Waterloo
-------------------------------------------------------------------------
SD649A 1278.45 1283.9 5.45 13.7 Waterloo
-------------------------------------------------------------------------
including 1281.7 1283.9 2.2 25.0
-------------------------------------------------------------------------
SD649A 1291.2 1293.7 2.5 15.4 Waterloo
-------------------------------------------------------------------------
SD649A 1304.7 1305.9 1.2 1.4 Basalt Flank
-------------------------------------------------------------------------
SD649A 1312.6 1315.5 2.9 1.3 Basalt Flank
-------------------------------------------------------------------------
SD649A 1328.1 1329.4 1.3 1.2 Intrusion
-------------------------------------------------------------------------
Future Exploration As a consequence of the very encouraging results
to date, a second drill will be added to the program almost
immediately to more rapidly evaluate the extent of the
mineralization in the area of hole SD649A. Current plans are to
drill two daughter holes using the SD649A parent hole and to drill
two additional parent holes, one north and one south of the
discovery hole along strike, each with three to four daughters.
These holes should be complete by the middle of 2011 at which point
Northgate will evaluate whether mineralization in the area is
sufficiently robust to support drifting across to the zone to
complete resource definition drilling. Quality Control - Analyses
and Sample Location The quality assurance/quality control and other
analytical and testing procedures for sample analysis and drill
hole survey methodology were those reported in the Canadian
National Instrument 43-101 Standards of Disclosure for Mineral
Projects ("NI 43-101") compliant Technical Report filed on SEDAR
(www.sedar.com) on October 22, 2008. Qualified Persons The program
design, implementation, quality assurance/quality control and
interpretation of the results are under the control of Northgate's
geological staff, which includes a number of individuals, each of
who are qualified persons as defined under NI 43-101 and is
supervised by Steve Harper, Senior Exploration Geologist
(Australian Institute of Mining and Metallurgy). Mark Haydon
(Australian Institute of Geoscientists), Stawell Gold Mine's
Geology Manager, has supervised the preparation of the information
that forms the basis of this release, and is responsible for the
overall management of the program. Note to Investors: 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. Northgate Minerals Corporation is a gold and copper
producer with mining operations, development projects and
exploration properties in Canada and Australia. Our vision is to be
the leading intermediate gold producer by identifying, acquiring,
developing and operating profitable, long-life mining properties.
Cautionary Note Regarding Forward-Looking Statements and
Information: This Northgate press release contains "forward-looking
information", as such term is defined in applicable Canadian
securities legislation and "forward-looking statements" within the
meaning of the United States Private Securities Litigation Reform
Act of 1995, 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, 2009 or under the
heading "Risks and Uncertainties" in Northgate's 2009 Annual
Report, both of which are available on the SEDAR website at
www.sedar.com, 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. Cautionary Note to US Investors
Regarding Mineral Reporting Standards: Northgate prepares its
disclosure in accordance with the requirements of securities laws
in effect in Canada, which differ from the requirements of U.S.
securities laws. Terms relating to mineral resources in this press
release are defined in accordance with National Instrument
43-101-Standards of Disclosure for Mineral Projects under the
guidelines set out in the Canadian Institute of Mining, Metallurgy,
and Petroleum Standards on Mineral Resources and Mineral Reserves.
The Securities and Exchange Commission (the "SEC") permits mining
companies, in their filings with the SEC, to disclose only those
mineral deposits that a company can economically and legally
extract or produce. The Company uses certain terms, such as,
"measured mineral resources" "indicated mineral resources",
"inferred mineral resources" and "probable mineral reserves", that
the SEC does not recognize (these terms may be used in this press
release and are included in the Company's public filings which have
been filed with securities commissions or similar authorities in
Canada). Ms. Keren R. Yun, Director, Investor Relations, Tel:
416-216-2781, Email: ngx@northgateminerals.com,
www.northgateminerals.com
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