Canyon Updates Underground Mine Design Study for Its Briggs Mine
February 06 2008 - 8:15AM
PR Newswire (US)
GOLDEN, Colo., Feb. 6 /PRNewswire-FirstCall/ -- Canyon Resources
Corporation (AMEX:CAU), a Colorado-based mining company is pleased
to provide the results of a new technical report that expands on
the underground mining potential at its Briggs Mine in Inyo County,
California. This new study expands underground mineral reserves
previously announced on February 6, 2007 and was based on
additional drilling on the Goldtooth structure at Briggs in the
first half 2007 as reported on July 30, 2007. The following table
displays the new mineral reserve estimate for the Briggs Mine: Gold
Grade Gold Ounces Proven & Probable Reserves Tons (opt)
Contained Open-Pit * 4,160,000 0.026 108,500 Underground (Probable
only)** 259,000 0.164 42,500 Total Proven & Probable 4,419,000
0.034 151,000 * Estimated using a $500 gold price (February 2007)
** Estimated using a $600 gold price (January 2008) Not included in
the above estimate is 142,200 tons of in-place mineralized material
at a grade of 0.133 ounces of gold per ton ("opt") that does not
meet mineral reserve criteria contained within the underground mine
design. A combination of the open pit and underground mining would
recover approximately 140,000 ounces of gold over a four and a half
year life assuming that underground production commences nine
months after the start of open pit mining. The Briggs Mine is a
permitted mining facility with ongoing residual gold production
from its existing leach pad. The mine has produced over 555,000
ounces of gold from open pit and underground mining since 1996.
"This study confirms our ability to improve project economics and
mine life at Briggs with additional drilling and underground
development. Leverage to the increased gold price is clearly
evident. This analysis is based on surface drilling only, so
underground drifting and test mining will be required to prove
continuity, potential, and mineability," states James Hesketh,
President and CEO. The underground mine design report was prepared
by Practical Mining LLC of Spring Creek, Nevada, dated January 14,
2008. The base case was generated utilizing a three year average
gold price of $600 for mineral reserve declaration purposes and a
second case was completed utilizing a $700 gold price and drilled
mineralization in all categories to demonstrate upside project
potential from known resources. Both design studies included only
material located along the Goldtooth structure outside of existing
open pit mine designs. Underground mine designs were developed
using a cutoff grade of 0.08 ounces per ton (opt) for stopes and
0.01 opt for development material which must be mined regardless of
grade. Mine designs were based on the mechanical longhole stoping
mining method with access by adit from outside existing and future
open pit design limits. Ore mined by underground operation would be
commingled with open pit ore at the crusher and placed on a lined
pad for gold leaching. Plant and overhead costs developed in the
February 2007 open pit feasibility study were updated in this
study, which included estimated costs for contract underground
mining. A second underground mining case was developed to
demonstrate the potential for improved project economics and
underground mine life with additional drilling along the Goldtooth
fault. The Goldtooth structure is a major north-south trending
high-angle structure that has been mapped for more than 10,000 feet
of strike length within the Briggs project permit area.
Approximately 4,900 feet of this structure has been tested by
drilling and the zone remains open for extension both along strike
and down dip. This scenario incorporated all drill information on
the Goldtooth structure, including mineralization that does not
currently meet reserve criteria, and a $700 gold price. In-situ
mineralized material contained within these designs total 855,000
tons at a grade of 0.136 opt using cutoff grades mentioned above.
Potential gold recoverable from only underground operations in this
"what-if" study would be approximately 116,000 ounces (versus
42,500 ounces) over a five year mine life at cash costs of
approximately $405 per ounce. This case would require an additional
$7.9 million of capital, if mined in conjunction with the open pit
development and provide an incremental project IRR of 77%. The
stand alone open pit feasibility study for Briggs was developed in
late 2006. This study showed a combined reserve in three pits of
4.16 million tons at a grade of 0.026 opt totaling 108,500 ounces
at an average strip ratio of 3.4 tons of waste per ton of ore.
Costs utilized to develop these plans were based on new mine
designs, past operating parameters, late 2006 fuel price,
consumable prices and labor costs. Cash cost of operation for the
open pit case on a stand alone basis, with no contribution from the
underground, is approximately $449 per ounce produced and an
initial capital cost of $8.25 million. Stand-alone open pit project
economics include pre-development costs, site refurbishment capital
costs and all site reclamation and closure costs, including
existing closure liability cost. The open pit case is expected to
produce 89,100 ounces of gold over a four year life to generate a
pre-tax IRR of 16% and a net return of $3.8 million using a gold
price of $600 per ounce. Cash flow for a combined open pit and
underground operation would improve by nearly $14.0 million per
every $100 increase in gold price. For additional information on
Canyon Resources, please visit our website at
http://www.canyonresources.com/. This press release includes
"forward-looking statements" within the meaning of Section 27A of
the Securities Act of 1933, as amended and Section 21E of the
Securities Exchange Act of 1934 as amended. Such forward-looking
statements include, among others, feasibility and drilling studies
related to potential open pit and underground mining design for the
Briggs Mine, mineralized material estimates, reserves estimates,
potential capitalized costs, drilling capability and the potential
reopening or expansion of the Briggs Mine. Factors that could cause
actual results to differ materially from these forward-looking
statements include, among others: the volatility of gold prices;
potential operating risks of mining, development and expansion; the
uncertainty of estimates of reserves, mineralized material and gold
deposits; and environmental and governmental regulations;
availability of financing; the outcome of litigation, as well as
judicial proceedings and force majeure events and other risk
factors as described from time to time in the Company's filings
with the Securities and Exchange Commission. Most of these factors
are beyond the Company's ability to control or predict. FOR FURTHER
INFORMATION, CONTACT: James Hesketh, President and CEO (303)
278-8464 Valerie Kimball, Investor Relations (303) 278-8464
http://www.canyonresources.com/ DATASOURCE: Canyon Resources
Corporation CONTACT: James Hesketh, President and CEO, or Valerie
Kimball, Investor Relations, both of Canyon Resources Corporation,
+1-303-278-8464 Web site: http://www.canyonresources.com/
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