Great Basin: Burnstone Mine Mineral Reserves Up 55% From January 2009 >GBG
GREAT BASIN GOLD UPDATES HOLLISTER AND BURNSTONE MINERAL RESERVES AND LIFE OF
MINE ESTIMATES AND ANNOUNCES NEW TERM LOAN FINANCING
VANCOUVER, Feb 02, 2011 /PRNewswire via COMTEX/ -- Highlights
Hollister updated Mineral Reserve and 2011E production guidance of approximately
110,000 recovered gold equivalent ounces (Au(eqv) oz)
Hollister forecast Life of Mine ("LOM") average production of 110,000 Au(eqv) oz
over 8 years at steady state with a cash cost, inclusive of royalties of
approximately US$527 per Au(eqv) oz recovered over the LOM.
Burnstone updated Mineral Reserve increased by 55% and 2011E production guidance
of 110,000 to 140,000 recovered gold oz (Au oz)
Burnstone forecast LOM average production of 254,000 Au oz over 25 years at
steady state with a cash cost, inclusive of royalties, of US$450 per Au oz
recovered over the LOM
Final credit approval for Term Loan financing of US$60 million of which US$52
million will be used to retire senior secured notes
Great Basin Gold Ltd. ("Great Basin Gold" or the "Company"),
(CA:GBG)(GBG)(jse:GBG) announces increases for both its Hollister Project and
Burnstone Mine Mineral Reserve and life-of mine ("LOM") estimates. The Company
has also received credit committee approval for a US$60 million Term Loan
financing from Credit Suisse AG, the proceeds of which will be used to repay the
high cost Senior Secured Notes issued during the 2008 credit crisis.
Hollister Project, Carlin Trend, Nevada
Ongoing technical work at Hollister has resulted in a 13% increase, on a directly
comparable basis, in the Mineral Reserves from those published in January 2009.
(Capitalized terms not otherwise defined herein have the meanings set out in
Canadian National Instrument 43-101 Standards of Disclosure for Mineral Projects)
The Hollister project is still in the trial mining stage, however, based on
production techniques tested to date, the Company has estimated applicable call
factors for mining of approximately 85% and metallurgical recoveries of
approximately 92% for Au and 85% for Ag. Since the 2009 Mineral Reserve estimate,
a total of 165,772 tons have been extracted at an average grade of 1.06 Au(eqv)
oz/ton (36.4 g/t), delivering 176,387 Au(eqv) contained ounces. At a cut-off
grade of 0.25 oz/ton (8.57 g/t) Au, the combined Proven and Probable Mineral
Reserves contain an estimated net 907,000 Au(eqv) ounces, grading 0.79 oz/ton
(27.02 g/t) Au and 4.75 oz/ton (163 g/t) silver (Ag) after application of the
noted call factors for mining and metallurgical recoveries.
Results of Hollister's January 2011 Mineral Reserve Estimate are shown below:
Reserve categoryCut-off TonsAuoz AuAgoz AgAu
oz/tonoz/tonoz/tonequivalent
oz
Proven0.25347,1001.33460,300 7.752,689,400 500,700
Probable0.25701,8000.53371,800 3.272,296,600 406,300
Total Proven & Probable 0.251,048,900 0.79832,100 4.754,986,000 907,000
Note:*The equivalent gold ounces reported herein were calculated using a gold
price of US$1,000/oz, a silver price of US$15/oz. A call factor of 85% and
metallurgical recovery factors of 92% for Au and 85% for Ag were applied.
The table below shows the reconciliation between the depleted January 2009 and
January 2011 Mineral Reserve estimates, using a cut-off of 0.25 oz/t Au and
applying similar call factors and metallurgical recoveries:
DescriptionCut-off TonsAuAu
oz/ton('000) equivalent equivalent
oz/tonoz ('000)
January 2009 Reserve estimate*0.251,3980.901,257
Apply 85% call factorN/A--(188)
Trial mined 2009 -2011N/A(166)1.06(176)
Apply metallurgical recoveriesN/A--(90)
Restated January 2009 Reserve estimate N/A1,2320.65803
January 2011 Reserve estimate0.251,0480.87907
Mineral Reserves added104
Note: *No mining and plant recovery factors applied
A minimum stoping width of 0.91 meters (36 inches) was assumed for purposes of
Mineral Reserve estimation, along with dilution defined as waste tonnes (or tons)
carrying zero grade and 100 percent in-stope extraction. An analysis by the
Company's technical staff confirms that no systematic, in-stope pillars will be
required because of the cut-and-fill trial mining method now being utilized.
Based on the results of trial stoping and grade reconciliation studies, where
vein widths of 0.76 meters (30 inches) or greater were considered, a total of
0.15 meters (six inches) of hanging wall dilution and 0.15 meters (six inches) of
footwall dilution was applied. Where appropriate, other average dilution rates
were applied. The in-situ wireframe model generated with the Mineral Resource
update announced September 9, 2010, were used as basis for this mineral reserve
update.
Using the updated Mineral Reserve estimate, an average production profile of
110,000 Au(eqv) oz over 8 years was projected with the estimated cash cost,
inclusive of royalties, amounting to US$527 per Au(eqv) oz recovered over the
LOM. Cash costs for 2011 are forecast to be in the range of US$550 - US$600 per
Au eqv oz. The estimated Net Present Value ("NPV") of the Hollister Project
(using metal prices of US$1,000/oz for Au and US$15/oz for Ag) at a 5% discount
rate is calculated at US$236 million.
Burnstone Mine, Witwatersrand Basin, South Africa
At Burnstone, Mineral reserves increased by 55% with the majority of the increase
attributable to the improved geological information obtained from underground
development and drilling conducted since the January 2009 reserve update as well
as additional reserves included from Area 2. Detailed planning has shown that
production at Area 2 of the Burnstone property can be increased and be extracted
through separate infrastructure. Since the January 2009 reserve update, Great
Basin Gold has completed over 6,000 meters (19,685 feet) of on-reef development
and over 3,851 meters2 (41,452 feet2) of long hole stoping ("LHS"). The January
2011 Mineral reserve update and LOM planning is based on LHS as the preferred
mining method, and the decrease in dilution from this mining method also
positively impacted on the updated reserve estimate.
At a cut-off gold content of 350 centimeter-grams per tonne (cmg/t) the combined
Proven and Probable Mineral reserves contain 6.4 million Au oz grading 4.47 g/t
(0.13 oz/ton) Au after application of a 95% call factor for mining and a 95%
metallurgical recovery. Currently, 53% of the Measured and indicated Mineral
resources have been converted into Proven and Probable Reserves.
Results of Burnstone's January 2011 Mineral Reserve Estimate are tabulated below:
Reserve categoryCut-off TonnesAu g/t oz Au
cmg/t
Proven35029,784,000 4.113,933,000
Probable35014,436,000 5.232,427,000
Total Proven & Probable 35044,220,000 4.476,360,000
Using the updated Mineral Reserve estimate, an average annual production profile
of 254,000 Au oz over 25 years was scheduled with the cash cost, inclusive of
royalties, amounting to US$450/oz of Au recovered over the LOM. The estimated NPV
for Burnstone (using a metal price of US$1,000/oz for Au and an exchange rate of
USD1: ZAR9) at a 5% discount rate is US$1,530 million.
The potential for an increase in the production build-up in the medium term using
LHS as the preferred mining method is demonstrated by the updated LOM plan.
On-reef development remains the key to delivering the planned production build-up
and will therefore be the priority focus for 2011. The production range of
110,000 to 140,000 Au oz is therefore the result of the increased focus on
on-reef development. Cash costs for 2011 are forecast in the range of US$520 -
US$620/oz and are impacted by the diluted grade from the additional on-reef
development.
The metallurgical plant has achieved its targeted rate for January 2011 of 90,000
tonnes milled. The current focus is to ramp up production and achieve a milling
rate of 125,000 tons per month.
The Burnstone Mineral Resources have been revised in-line with the Mineral
reserve update. The Mineral Resources announced August 23, 2010 were based on a
"4 2 1 model", which uses a minimum of 4 informing samples for a Measured
Resource classification, 2 for an Indicated classification and 1 for an Inferred
classification. The current model uses the same estimation parameters but more
stringent classification criteria, which is a minimum of 6 informing samples for
Measured, 3 for Indicated and 2 for Inferred.
A comparison of the Mineral Resources estimated under the two models at a range
of gold content cut-off values is tabulated below:
Comparison of Burnstone 6 3 2 vs 4 2 1 Mineral Resource Estimates
6 3 2? model4 2 1? model
ResourceCut offMassAu grade Au Content MassAu grade Au Content
Classification Cmg/tM tonsg/tOzM tonsg/toz
Measured30041.25.677,496,00040.05.787,435,000
Measured35037.25.786,900,00036.55.906,927,180
Measured40033.15.946,326,00033.76.016,514,390
Indicated30023.57.315,516,00031.26.446,472,770
Indicated35021.37.605,199,00027.26.845,978,830
Indicated40019.87.774,956,00024.17.205,567,960
M + I30064.66.2613,012,000 71.26.0713,907,770
M + I35058.46.4412,099,000 63.76.3012,906,010
M + I40053.06.6311,283,000 57.86.5012,082,350
Inferred30066.84.339,306,00067.54.339,392,970
Inferred35054.94.758,374,00061.04.498,799,830
Inferred40049.14.867,679,00052.24.757,977,520
Note: Mineral Resources are undiluted and assume 100% metallurgical
recoveries.
Mineral Resources that are not Mineral Reserves do not have demonstrated
economic viability.
The Mineral Resources under the 6 3 2 model above include the Mineral
Reserves reported in the previous table.
16 3 2 indicates minimum number of informing points for Measured (6),
Indicated (3) and Inferred (2)
24 2 1 indicates minimum number of informing points for Measured (4),
Indicated (2) and Inferred (1)
At a 350 cmg/t cut-off, the tighter classification parameters have resulted in an
8% decrease in total Measured and Indicated Resources tonnage, a 2% increase in
grade from 6.30 to 6.44 g/t Au, and a combined 6% adjustment downwards of
contained gold in the Measured and Indicated Resources categories to 12.1 million
ounces. The 350 cmg/t cut-off is lower than the 400 cmg/t used for previous
estimates and conversions to Mineral Reserves, reflecting increased confidence in
these estimates.
Term Loan Financing Finalized
Great Basin Gold has also obtained final credit approval from Credit Suisse AG to
enter into a Term Loan Financing for US$60 million which is now primarily subject
only to negotiation of customary definitive loan documents. Key terms include:
Maximum term of 4 years from date of drawdown, with interest and capital
repayment commencing 3 months after draw down.
Interest at a margin of 3.75% over the USD LIBOR rate (currently 0.3%).
Great Basin Gold will have the option to retire the loan 12 months after draw
down at no additional cost.
Secured by the Hollister Project and Esmeralda property.
Hedging program typical for these facilities will be finalized and implemented in
the following weeks. It is anticipated that a zero-cost-collar structure for a
total of up to 105,000 Au oz over the next 4 years of gold production will form
the basis for the program.
It is anticipated that this transaction will be closed before the end of February
2011. The net proceeds from this financing will be used to settle the 2008 Senior
Secured Notes which currently bear interest at 14% per annum.
Ferdi Dippenaar, Great Basin Gold CEO, commented:
"Our ongoing evaluations of the two ore bodies, which encompass delineation
drilling and results from trial mining, continue to confirm the value of the
Hollister and Burnstone properties, as evidenced in both increased reserves and
increased confidence in our measurements. The tighter geological controls used in
determining these estimates are also improving trial stope tonnage and grade
estimates and, as a consequence, our mine planning is benefiting from more
accurate information.
"At Hollister, exploration drilling from underground is successfully tracking the
lateral extensions of the Hollister veins northwestward to the Gloria vein system
and the Butte bounding fault structure, and southeastward from the Gwenivere vein
system to the Hatter Graben. As the underground development continues, there will
be further opportunities to drill test the extensions of a number of high grade
zones that are emerging from this evaluation work.
"Production from trial mining at Hollister is expected to remain at the level of
110,000 recovered-Au(eqv) oz/annum for the near future. We have conservatively
estimated production at the Burnstone mine, which will experience its first full
year of mining in 2011, and have focused the management team on prioritizing
on-reef development to ensure that this plus 25-year life, world class project
has a solid foundation to deliver successful production in the future.
"With the commitment of the Credit Suisse facility, Great Basin Gold now has the
necessary funds to retire the US$52 million Senior Secured Notes, a debt facility
put in place in November 2008. This both reduces our cost of capital and provides
us better financial coordination with a single corporate lender."
The Mineral Reserve estimates and other technical information herein were
completed under the supervision of Johan Oelofse, Pr.Eng., FSAIMM, Great Basin
Gold's Chief Operating Officer. Mr Oelofse is a Qualified Person as defined by
Canadian Securities Regulations in National Instrument 43-101, who has also
reviewed and approved the information in this news release.
The Mineral Resource estimate for Burnstone was completed by Freddie de Bruin,
Pr.Sci.Nat., of Deswik Mining and Resource Consultants, under the supervision of
Phil Bentley, Pr.Sci.Nat., Great Basin Gold's Vice President: Geology &
Exploration. Mr Bentley is a Qualified Person as defined by Canadian Securities
Regulations in National Instrument 43-101, who has also reviewed and approved the
information in this news release.
Details of these estimates will be included in NI 43-101 compliant technical
reports filed on sedar.com.
Ferdi Dippenaar President and CEO
Samples collected from the Hollister Development Block Project are delivered to
Inspectorate America Corporation (Inspectorate) in Sparks, Nevada. The primary
analytical facility for the Burnstone Project from 2003-2005 has been SGS
Lakefield Research Africa (Pty) Limited and subsequently (2006-2010), ALS Chemex
has been the primary laboratory. Both facilities are located in Johannesburg,
South Africa.
This document contains "forward-looking statements" that were based on Great
Basin Gold's expectations, estimates and projections as of the dates as of which
those statements were made. Generally, these forward-looking statements can be
identified by the use of forward-looking terminology such as "outlook",
"anticipate", "project", "target", "believe", "estimate", "expect", "intend",
"should" and similar expressions. Forward-looking statements are subject to known
and unknown risks, uncertainties and other factors that may cause the Company's
actual results, level of activity, performance or achievements to be materially
different from those expressed or implied by such forward-looking statements.
These include but are not limited to:
uncertainties and costs related to the Company's exploration and development
activities, such as those associated with determining the extent of mineral
resources or reserves which exist on a property;
uncertainties related to feasibility studies that provide estimates of expected
or anticipated costs, expenditures and economic returns from a mining project;
uncertainties related to expected production rates, timing of production and the
cash and total costs of production and milling;
uncertainties related to the ability to obtain necessary licenses, permits,
electricity, surface rights and title for development projects;
operating and technical difficulties in connection with mining development
activities;
uncertainties related to the accuracy of our mineral reserve and mineral resource
estimates and our estimates of future production and future cash and total costs
of production, and the geotechnical or hydrogeological nature of ore deposits,
and diminishing quantities or grades of mineral reserves;
uncertainties related to unexpected political, judicial or regulatory
proceedings;
changes in, and the effects of, the laws, regulations and government policies
affecting our mining operations, particularly laws, regulations and policies
relating to
mine expansions, environmental protection and associated compliance costs arising
from exploration, mine development, mine operations and mine closures;
expected effective future tax rates in jurisdictions in which our operations are
located;
the protection of the health and safety of mine workers; and
mineral rights ownership in countries where our mineral deposits are located,
including the effect of the Mineral and Petroleum Resources Development Act
(South Africa);
changes in general economic conditions, the financial markets and in the demand
and market price for gold, silver and other minerals and commodities, such as
diesel fuel, coal, petroleum coke, steel, concrete, electricity and other forms
of energy, mining equipment, and fluctuations in exchange rates, particularly
with respect to the value of the U.S. dollar, Canadian dollar and South African
rand;
unusual or unexpected formation, cave-ins, flooding, pressures, and precious
metals losses (and the risk of inadequate insurance or inability to obtain
insurance to cover these risks);
changes in accounting policies and methods we use to report our financial
condition, including uncertainties associated with critical accounting
assumptions and estimates;
environmental issues and liabilities associated with mining including processing
and stock piling ore;
geopolitical uncertainty and political and economic instability in countries
which we operate; and
labour strikes, work stoppages, or other interruptions to, or difficulties in,
the employment of labour in markets in which we operate mines, or environmental
hazards, industrial accidents or other events or occurrences, including third
party interference that interrupt the production of minerals in our mines.
Cash costs per ounce are numbers commonly used in the mining industry to assess
performance. They are not terms recognized under generally accepted accounting
principles. Investors will wish to review the NI 43-101 technical reports which
support these estimates in order to understand the cost elements which make up
the cash cost estimate.
Information Concerning Estimates of Measured, Indicated and Inferred Resources
This news release also uses the terms "measured resources", "indicated resources"
and "inferred resources". The Company advises investors that although these terms
are recognized and required by Canadian regulations (under National Instrument
43-101 Standards of Disclosure for Mineral Projects), the U.S. Securities and
Exchange Commission does not recognize them. Investors are cautioned not to
assume that any part or all of the mineral deposits in these categories will ever
be converted into SEC-recognized reserves. In addition, 'inferred resources' have
a great amount of uncertainty as to their existence, and economic and legal
feasibility. It cannot be assumed that all or any part of an Inferred Mineral
Resource will ever be upgraded to a higher category. Under Canadian rules,
estimates of Inferred Mineral Resources may not form the basis of feasibility or
pre-feasibility studies, or economic studies except for Preliminary Assessment as
defined under 43-101. Investors are cautioned not to assume that part or all of
an inferred resource exists, or is economically or legally mineable.
The mineralized material at the Hollister Project is currently classified as a
measured and indicated resource, and a portion of it qualifies under Canadian
mining disclosure standards as a proven and probable reserve, but readers are
cautioned that no part of the Hollister Project's mineralization is considered to
be a reserve under US mining standards as all necessary mining permits and
project financing would be required in order to classify the project's
mineralized material as an economically exploitable reserve. Although work has
been done to confirm the mine design, mining methods and processing methods
assumed in the 2011 Update, construction and operation of the mine and processing
facilities depend on securing environmental and other permits on a timely basis.
Additional permits, when required, have yet to be applied for and there can be no
assurance that required permits can be secured or secured on a timely basis.
For further information on Great Basin Gold, investors should review the
Company's annual Form 40-F filing with the United States Securities and Exchange
Commission sec.com and home jurisdiction filings that are available at
sedar.com.
SOURCE Great Basin Gold Ltd. |
