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StrataGold Corporation (SGV-TSX) ("StrataGold" or the "Company") is pleased to announce (Thursday) that a new independent National Instrument (NI) 43-101 Mineral Resource estimate by SRK Consulting (US) Inc. ("SRK"), has increased the Indicated Resource of the Mar-Tungsten Deposit by 44%.
– The Mar-Tungsten Deposit contains 65.7 million pounds of tungsten
(WO(3)) in the Indicated category and 8.5 million pounds of tungsten
(WO(3)) in the Inferred category based on a 0.1% WO(3) cutoff.
– Metallurgical test work recovered ~90% WO(3) by way of a combined
gravity-flotation approach.
– The price for tungsten (WO(3)) is US$11.57 per pound as at
September 24, 2008.
– SRK has been engaged to complete a Preliminary Economic Assessment on
the Mar-Tungsten Deposit.
– StrataGold is evaluating opportunities to realize value for the
Mar-Tungsten Deposit for its shareholders.
2008 Exploration Program
StrataGold drilled 34 diamond drill (DD) holes for a total of 4057.68 metres (m) on the Mar-Tungsten Deposit in 2008 (see news release August 28, 2008). The 2008 diamond drill (DD) program successfully extended the scheelite mineralization up dip toward the surface and along strike. Additionally, infill drilling showed good grade continuity, resulting in significant conversion of previously inferred resource into the current indicated resource category. The deposit remains open down dip and along strike to the north. The Mar-Tungsten Deposit is located within StrataGold's wholly owned Dublin Gulch property, Yukon Territory, Canada, 2.5 kilometres (km) east of the Eagle Zone (gold) Deposit.
Mar-Tungsten Deposit Resource Statement(1)
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Contained WO(3) MTU's
Resource Total % WO(3) WO(3) (metric tonne
Category Tonnes Grade(*) (pounds) units(xx))
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Indicated 7,819,330 0.381 65,679,443 2,979,000
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Inferred 945,374 0.410 8,545,030 387,600
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(*) A cut-off grade of 0.10% WO(3) was used for this resource statement
(xx) An MTU is defined as 1/100th of a metric tonne or 22.05lbs.
Metallurgical Test Results
Under the direction of SRK, samples were collected from the 2008 drill core to be composited and are considered representative of the Mar-Tungsten Deposit. The average grade of the composite used for testing was 0.39% WO(3) which is consistent with the Indicated Resource grade of 0.381% WO(3). The metallurgical test work was carried out by SGS Canada Inc. and the scope of the program involved chemical and mineralogical analyses, bond ball mill work index (BWI) testing and flow sheet options for the recovery of tungsten via gravity concentration and flotation.
The mineralized material is largely free of deleterious minerals such as clay, fluorite and molybdenum and the tungsten is hosted by scheelite. The composite sample responded well to flotation and gravity concentration with a conventional flow sheet. A combined gravity-flotation approach is contemplated with gravity recovering 60-65% WO(3) to a high grade concentrate (62.60% WO(3)) and flotation expected to recover ~20% to a lower grade concentrate which could be blended with the gravity concentrate. A combined gravity flotation approach recovered ~90% of WO(3) to a rougher concentrate. SGS recommended additional work with the rougher flotation concentrate to focus on flotation cleaning, gravity cleaning and a combination of the two.
Grindability testing on the minus 10 mesh composite resulted in a Bond Ball Work Index (BWI) of 14.1 kWh/t. According to the SGS database of other BWI indices the ore is of medium hardness.
A copy of the full resource calculation report will be available on the SEDAR website within 45 days of this press release. The NI 43-101 mineral resource estimate, which is effective October 16, 2008, was prepared by SRK Consulting (US) Inc., an independent consulting firm. The qualified person (as described under NI 43-101) responsible for the resource estimate and technical content of this press release is Dr. Bart Stryhas, PhD, a Principal Resource Geologist at SRK.
Quality Control, Assurance and Data Verification
A rigorous Quality Control and Assurance program (QC/QA) is in place, using control samples and duplicates, as well as Chain of Custody (COC) protocols. Tamperproof sample bags and sample tags were utilized for all of the drill samples. All Mar-Tungsten drill samples were prepared and analyzed by ALS Laboratory Group located in British Columbia, Canada. ALS is an ISO 9001:2000 registered and accredited to ISO 17025:2005 by the Standards Council of Canada (SCC) for specific analytical procedures. The control samples and duplicate assay results received for the drilling program demonstrate to StrataGold that the results are considered reliable. The technical information in this news release has been prepared in accordance with Canadian regulatory requirements set out in National Instrument 43-101.
The exploration program was conducted under the supervision of qualified person Terry Tucker, P.Geo., StrataGold's President and CEO. Terry Tucker has reviewed the technical content of this press release.
(1)Notes:
1. This drilling has been audited and validated by SRK in accordance
with CIM Estimation of Mineral Resources and Mineral Reserves Best
Practice Guidelines and with National Instrument 43-101 guidelines by
Dr. Bart Stryhas, PhD, an independent Qualified Person as defined by
NI 43-101.
2. The resource estimation employed a categorical indicator approach
based on a 0.1% WO(3) cut-off. Grade estimation was made using an
inverse distance squared algorithm within blocks having a probability
of 50% and higher.
3. Drillhole WO(3) assays were composited into 2 m downhole lengths and
capped at 3%.
4. Tonnage was estimated based on a specific gravity assigned by rock
type and alteration type. The specific gravities ranged between 2.7
and 2.9 g/cm(3)
5. Mineral resources are not mineral reserves and do not have
demonstrated economic viability.
6. Mineral resources were classified according to the CIM Definition
Standards for Mineral Resources and Mineral Reserves by Dr. Bart
Stryhas, PhD, an independent Qualified Person as defined by NI 43-
101.
7. SRK is not aware of any known environmental, permitting, legal,
title, taxation, socio-economic, marketing or other relevant issues
that could potentially affect this estimate of mineral resources. The
mineral resources may be affected by subsequent assessments of
mining, environmental, processing, permitting, taxation, socio-
economic and other factors. There is insufficient information at this
early stage of study to assess the extent to which the resources will
be affected by these factors, which are more appropriately assessed
in a conceptual study.
About StrataGold Corporation
StrataGold is a gold development company focused on the systematic exploration and development of two advanced-stage gold projects, Dublin Gulch, Yukon (including the Eagle Zone and Mar-Tungsten Deposits), Tassawini, Guyana and the BRL Venture with Newmont in Guyana. To obtain additional information, photos, project updates and maps pertaining to this news release, please visit: www.stratagold.com. – Press Release