Great Basin Gold Ltd. - Results of Trial Mining and Ongoing Metallurgical Test Work at Hollister
03 Fevereiro 2009 - 11:30AM
PR Newswire (US)
VANCOUVER, Feb. 3 /PRNewswire-FirstCall/ -- Great Basin Gold Ltd.
("Great Basin Gold" or the "Company") (TSX: GBG; NYSE Alternext:
GBG; JSE: GBG) announces the results of its ongoing underground
exploration and development (inclusive of trial mining and
metallurgical test work) at Hollister for the year ended December
31, 2008. During the period under review, the Company continued
with infrastructure establishment which included the completion of
an expanded waste rock disposal facility, a third rapid
infiltration basin and commissioning of the water desilting
facility. Different stoping methods were also under trial at
Hollister during 2008. The results of the shrinkage and cut/fill
methods yielded an average gold equivalent grade of 1.6 oz/ton(1).
The average minimum mining widths for both the shrinkage and cut
and fill stopes was 42 inches (3.5 feet). Vein recovery in the
surveyed shrinkage and cut/fill stopes was 99%. A third stoping
method, thermal fragmentation, is being tested at Hollister as a
research and development project.
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HOLLISTER RESULTS AND RELATED COSTS for bulk sampling and trial
mining to December 31, 2008
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ACTUAL COMMENTS
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Ore extracted (tons) 50,161
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Ore treated (tons) 33,830 Under Processing Agreements
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Extracted equivalent In line with management forecast ounces 80,305
of 80,000 equivalent ounces
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Average grade extracted (gold Higher than management forecast
equivalent oz/ton) 1.60 of 1.1 gold equivalent oz/ton
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Recovered equivalent ounces for the year from processing agreements
38,465
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Average grade Gold recovery percentage in the ore recovered (gold
purchase agreement with Midas negatively equivalent oz/ton) 1.14
impacted on the ounces recovered
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Cash cost per equivalent gold ounce, excl. milling and haulage
charges (US$ per equivalent Milling and haulage costs are excluded
gold ounce) 300 due to various options evaluated
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Milling and haulage costs (US$ per Costs were mainly affected by
the terms equivalent gold ounce) 215 of the Midas ore purchase
agreement
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(1) Material processed contains gold and silver. Gold equivalent
was calculated using Au price of US$650/oz & Ag price of
US$10/oz. During 2008, ore was shipped to two separate facilities
for further metallurgical testing. The metallurgical results are
reported in the table below. Material is pending treatment from the
November Newmont Midas tests and the Kinross Republic facility, so
the final milling results have yet to be determined.
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AU HEAD AG HEAD AU AG GRADE GRADE VOLUME RECOVERY RECOVERY (oz/ton)
(oz/ton) (dry tons) (%) (%)
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Newmont Midas (May) 1.15 9.53 4,737 84.7 94.3
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Newmont Midas (June) 0.75 9.70 3,906 88.2 92.6
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Newmont Midas (Sept) 1.43 12.07 10,907 88.1 91.1
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*Newmont Midas (Nov) 2.02 16.2 12,075 **OPA **OPA
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*Kinross Republic (Nov) 2.34 20.14 4,692 N/A N/A
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* Actual assays not yet processed. ** Actual recoveries not
available as it was based on ore purchase agreement with Newmont At
the end of December 2008, an additional approximately 10,273 gold
equivalent ounces were held in various stockpiles. Under the
current Plan of Operations approved by the Bureau of Land
Management (BLM), the Company is permitted to undertake underground
exploration and development inclusive of the taking and removal of
bulk samples, and doing trial mining. An amended Plan of Operations
to approve full production was submitted to the BLM in March 2008.
After evaluating the Company's proposal for full-scale production,
the BLM determined that the environmental analysis required for the
Plan of Operations amendment is an Environmental Impact Statement
(EIS). The initiation of the EIS process in conjunction with the
BLM is currently underway. Prior to the completion of the EIS
process and receiving BLM's approval of the amended Plan of
Operations, the underground exploration and development activities
at Hollister must be conducted within the limits set out in the
current BLM permit and in the renewed Water Pollution Control
Permit that the Nevada Division of Environmental Protection (NDEP)
recently issued. The ongoing trial mining operations will be
conducted in a manner that will protect the environment - including
the important archaeological resources near the mine - and will not
create any additional surface disturbance or other new
environmental impacts. During 2008 a total of 17,111 feet of
lateral and vertical development were excavated in waste and ore
(see below).
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ORE DEVELOPMENT EXPLORATION WASTE DEVELOPMENT (feet) DRIFTS, INCL
RAISES (feet)
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11,057 6,054
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The development is a critical phase of the detailed evaluation of
the vein systems and has enabled commensurate delineation drilling,
channel sampling and mapping. Using the existing infrastructure,
the planned 2009 underground program will develop approximately
260,000 tons of rock (both waste and ore) - similar to the volume
of rock developed and removed from the underground workings in
2008. Up to 275,000 tons of ore per annum is allowed to be
processed off-site in accordance with the NDEP Water Pollution
Control Permit to determine the metallurgical characteristics.
During December 2008, the Company announced that it had purchased
the Esmeralda Mill in Nevada, which it is planning to refurbish at
a cost of US$8.0 million. This facility will be redesigned to test
the Hollister bulk samples so that gold recoveries can be optimized
and revenues will closer reflect the spot price of gold and silver.
Ferdi Dippenaar, President and CEO, commented, "A number of
achievements have been made at our Hollister Project over the past
year. It was the first year that the current management team
evaluated the in-situ mineralization through a focused development
and trial mining program. A significant amount of exploration
development was required to gain access to a number of veins to
determine the mineability of the vein material. This was
subsequently followed up by metallurgical testing at a number of
sites, with mixed results. 2009 will be another exciting year, with
more exploration and trial mining planned to enable Great Basin
Gold to gain a better understanding of the optimal exploitation of
the Hollister deposit." Johan Oelofse, PrEng, FSAIMM, Chief
Operating Officer for the Company and a qualified person, has
reviewed this news release on behalf of Great Basin. No regulatory
authority has approved or disapproved the information contained in
this news release. This release includes certain statements that
may be deemed "forward-looking statements". All statements in this
release, other than statements of historical facts, that address
possible future commercial production, reserve potential,
exploration drilling results, development, feasibility or
exploitation activities and events or developments that Great Basin
Gold expects to occur are forward-looking statements. Although the
Company believes the expectations expressed in such forward-looking
statements are based on reasonable assumptions, such statements are
not guarantees of future performance and actual results or
developments may differ materially from those in the
forward-looking statements. Factors that could cause actual results
to differ materially from those in forward-looking statements
include market prices, exploitation and exploration successes,
continuity of mineralization, uncertainties related to the ability
to obtain necessary permits, licenses and title and delays due to
third party opposition, geopolitical uncertainty, changes in
government policies regarding mining and natural resource
exploration and exploitation, and continued availability of capital
and financing, and general economic, market or business conditions.
Investors are cautioned that any such statements are not guarantees
of future performance and those actual results or developments may
differ materially from those projected in the forward-looking
statements. For more information on the Company, Investors should
review the Company's annual Form 40-F filing with the United States
Securities and Exchange Commission and its home jurisdiction
filings that are available at http://www.sedar.com/. DATASOURCE:
Great Basin Gold Ltd. CONTACT: on Great Basin Gold Ltd. and its
gold properties, please visit the Company's website at
http://www.grtbasin.com/ or contact Investor Services: Tsholo
Serunye in South Africa, +27 (0)11 301 1800; Michael Curlook in
North America, 1-888-633-9332; Barbara Cano at Breakstone Group in
the USA, (646) 452-2334
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