McEwen Mining Inc. (NYSE:MUX)(TSX:MUX) is pleased to announce an
updated resource estimate for its 100% owned Los Azules Copper
Project in San Juan Province, Argentina. Drilling has increased
both the level of confidence associated with the mineralization and
the size of the resource. The estimated contained copper metal in
the Indicated Resource category has increased by 109% to 4.6
billion lbs. and the estimated contained copper metal in the
Inferred Resource category increased by 4% to 10.8 billion lbs.
Los Azules Copper Project Resource Highlights
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June 2010 June 2012
Resource Estimate Resource Estimate Update
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Cut-off Tonnage Cu Tonnage Cu % Change
Grade (million Grade Cu lbs (million Grade Cu lbs (contained
(Cu%) tonnes) (%) (billions) tonnes) (%) (billions) Cu)
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Indicated Resource
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0.35 137 0.73 2.2 323 0.65 4.6 +109%
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Inferred Resource
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0.35 900 0.52 10.4 948 0.52 10.8 +4%
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(i)Details for gold and silver resources are included in Table 1.
"Los Azules is one of the world's largest undeveloped copper
deposits. We are looking forward to commencing our most ambitious
drill program this November. This deposit appears to have good
potential to expand in size," stated Rob McEwen, Chairman and Chief
Owner.
The objective of the Company's exploration program since the
last resource update in June 2010 was to 1) test the expansion
potential; and 2) continue to infill portions of the deposit.
Drilling successfully expanded the overall size of the Inferred
resource while maintaining the same grade. In addition, 186 million
tonnes of Inferred resource was converted to the Indicated
category. The grade of the Indicated resource decreased since the
mineralization that was being upgraded was of a lower grade. Los
Azules has a significant high grade core (using a cut-off grade of
0.70% copper) totaling 112 million tonnes at an average grade of
0.89% copper in the Indicated category and 119 million tonnes at an
average grade of 0.86% copper in the Inferred category.
Despite limited drilling, approximately 8,100 meters from
January 2011 to April 2012, the expansion of the resource was
successfully achieved by drilling step-out holes primarily to the
southwest of the known deposit which confirmed that mineralization
continues laterally and at depth.
McEwen Mining has signed a contract with Major Drilling to
provide four core drills and one reverse-circulation drill for the
2012-13 drill season. These core rigs are considerably more
powerful than the ones used during the 2011-12 season and the
Company believes this will increase the likelihood of reaching
target depths (+700 meters), where high-grade copper mineralization
has been encountered. McEwen Mining anticipates starting the
upcoming drill season in November and plans a total of 15,000
meters of drilling.
About Los Azules
Los Azules is a large copper porphyry system located in western
San Juan Province within a belt of porphyry copper deposits that
straddles the Chilean/Argentine border. This belt contains some of
the world's largest copper deposits, including Codelco's El
Teniente and Andina mines, Anglo American's Los Bronces mine,
Antofagasta PLC's Los Pelambres mine and Xstrata's El Pachon
project, among others.
A portion of the Los Azules Copper Project is subject to
litigation in the Courts of British Columbia (please see Exhibit
1). Shareholders and other interested parties are encouraged to
review our most recent quarterly filings for detailed information.
The trial is set to commence in November 2012 and last for
approximately six weeks.
Table 1. Los Azules Mineral Resource Estimate
In order to exhibit reasonable prospects for economic viability,
the mineral resource estimate has been contained within a
conceptual open pit shell generated using general technical and
economic parameters that are defined at the end of this news
release. The base case cut-off grade of 0.35% Cu is highlighted in
the table.
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Au Ag
Grade Grade
Cut-off Tonnage Cu (grams (grams
Grade (million Grade Cu lbs per Au Oz per Ag Oz
(Cu%) tonnes) (%) (billions) tonne) (millions) tonne) (millions)
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Indicated Resource
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0.15 415 0.57 5.2 0.06 0.84 1.8 23.9
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0.20 401 0.58 5.1 0.06 0.82 1.8 23.2
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0.25 378 0.60 5.0 0.06 0.79 1.8 21.9
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0.30 350 0.63 4.8 0.07 0.75 1.8 20.5
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0.35 323 0.65 4.6 0.07 0.71 1.8 19.1
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0.40 295 0.68 4.4 0.07 0.66 1.9 17.7
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0.45 268 0.70 4.2 0.07 0.61 1.9 16.3
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0.50 238 0.73 3.8 0.07 0.55 1.9 14.7
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0.55 205 0.77 3.5 0.07 0.48 1.9 12.8
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0.60 174 0.80 3.1 0.08 0.42 1.9 10.9
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0.65 142 0.84 2.6 0.08 0.35 1.9 8.8
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0.70 112 0.89 2.2 0.08 0.28 1.9 6.9
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Inferred Resource
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0.15 2,486 0.35 19.1 0.05 3.67 1.6 128.7
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0.20 2,116 0.38 17.7 0.05 3.29 1.6 111.6
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0.25 1,660 0.42 15.4 0.05 2.77 1.7 90.7
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0.30 1,256 0.47 13.0 0.06 2.24 1.8 71.9
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0.35 948 0.52 10.8 0.06 1.79 1.8 56.1
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0.40 708 0.57 8.8 0.06 1.40 1.9 43.5
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0.45 523 0.62 7.1 0.06 1.08 2.0 33.3
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0.50 391 0.67 5.7 0.07 0.84 2.0 25.6
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0.55 285 0.72 4.5 0.07 0.63 2.1 19.1
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0.60 211 0.77 3.6 0.07 0.48 2.1 14.3
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0.65 158 0.82 2.8 0.07 0.37 2.2 11.0
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0.70 119 0.86 2.3 0.07 0.28 2.2 8.5
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(i) "Tonnes" is stated in metric and is equivalent to 2205 lbs.
(ii) Estimated contained metal values may be subject to rounding errors.
To view the figure associated with this release, please visit
the following link:
http://media3.marketwire.com/docs/mux0628fig1.pdf.
Details on the parameters of the resource estimate are as
follows:
-- The resource estimation was based on data from 163 drill holes
comprising a total length of 43,645 meters of drilling completed to the
end of April 2012.
-- There were a total of 20,557 individual samples selected for analysis.
The samples were collected and analyzed in accordance with industry
standards. Splits from the drill core samples were submitted to either
Alex Stewart in Mendoza or ALS Chemex or ACME in Santiago, Chile for
fire assay and ICP analysis. Accuracy of results is tested through the
systematic inclusion of standards, blanks and check assays.
-- The June 2012 mineral resource estimate for the Los Azules Copper
Project was prepared under the direction of Robert Sim P.Geo. of SIM
Geological Inc. The mineral resource estimate uses drill hole sample
assay results and the interpretation of a geologic model that relates to
the spatial distribution of copper, gold and silver in the deposit.
Interpolation characteristics were defined based on the geology, drill
hole spacing and geostatistical analysis of the data. Block grade
estimates were done using Ordinary Kriging (OK) with a nominal block
size measuring 20 meters long, 20 meters wide and 15 meters high.
Resources are classified according to their proximity to sample data
locations and are reported, as required under NI 43-101, according to
the CIM standards for Mineral Resources and Reserves.
-- As required under NI 43-101, reasonable prospects for economic viability
of the mineral resources have been exhibited by the application of a
resource limiting pit shell built about copper grades in the model using
a projected metal price of US$2.50 per lb. Cu, mining costs of US$1.00
per tonne, milling and G&A costs of US$4.25 per tonne, 100% recoveries
and an average pit slope of 34 degrees.
-- Mineral resources, which are not mineral reserves, do not have
demonstrated economic viability.
-- The quantity and grade of reported Inferred resources are uncertain in
nature and there has been insufficient exploration to classify these
inferred resources as Indicated or Measured, and it is uncertain if
further exploration will result in upgrading them to an Indicated or
Measured category.
About McEwen Mining (www.mcewenmining.com)
The goal of McEwen Mining is to qualify for inclusion in the
S&P 500 by 2015 by creating a high growth, low-cost, mid-tier
gold producer focused in the Americas. McEwen Mining's principal
assets consist of the San Jose Mine in Santa Cruz, Argentina (49%
interest); the El Gallo Complex in Sinaloa, Mexico; the Gold Bar
Project in Nevada, US; the Los Azules Project in San Juan,
Argentina and a large portfolio of exploration properties in
Argentina, Nevada and Mexico.
McEwen Mining has 267,919,384 shares issued and outstanding. Rob
McEwen, Chairman, President and CEO, owns 25% of the shares of the
Company. As of March 31, 2012, McEwen Mining had cash and liquid
assets of US$66.7 million, comprised of cash of US$41.1 million,
silver and gold bullion at market value of US$21.4 million,
short-term investments of US$3.1 million and marketable securities
of US$1.1 million. The Company continues to hold a significant
portion of its treasury in bullion with the belief that prices will
continue to rise.
Technical Information:
James K. Duff, Senior Consultant to the Company and a Registered
Member in good standing of the Society for Mining, Metallurgy and
Exploration, who is a Qualified Person as defined by National
Instrument 43-101 ("NI 43-101") has reviewed and approved the
contents of this news release. Bruce Davis, PhD, FAusIMM, who is a
Qualified Person as defined by NI 43-101 and responsible for the
quality control for the assaying of the Los Azules drill core has
reviewed the assay quality control information. All samples were
collected in accordance with industry standards. Splits from the
drill core samples were submitted to the ACME sample preparation
laboratory in Mendoza, Argentina, and then transferred to ACME's
laboratory in Santiago, Chile for fire assay and ICP analysis.
Accuracy of results is tested through the systematic inclusion of
standards, blanks and check assays. The mineral resource estimate
referenced in this press release was prepared in June 2012 by
Robert Sim, P.Geo. and Bruce Davis, PhD, FAusIMM, both independent
Qualified Persons as defined by NI 43-101.
For further information in respect of the Los Azules Project
please refer to the technical report entitled "Canadian National
Instrument 43-101 Updated Preliminary Assessment, Los Azules
Project, San Juan Province, Argentina" dated December 16, 2010,
prepared by Kathleen Altman, Robert Sim, Bruce Davis, William L.
Rose, Scott Elfen, and Richard Jemielita, each of whom is an
independent Qualified Person as defined by NI 43-101. This report
is available under Minera Andes Inc.'s (acquired by McEwen Mining)
profile on SEDAR (www.sedar.com). There can be no assurance that
the capital cost estimates in this report remain accurate; given
the inflationary pressure in the mining industry and in Argentina,
these capital costs, if calculated as of today's date, are likely
to increase significantly.
The Los Azules PEA and the resource estimates and other
information contained herein do not constitute a feasibility or
pre-feasibility study and contain no mineral reserves within the
meaning of NI 43-101 or SEC Industry Guide 7. The mineral resource
figures referred to in this press release and the Los Azules PEA
are estimates and therefore insufficient to allow meaningful
application of the technical and economic parameters to enable an
evaluation of technical or economic viability and no assurances can
be given that the indicated levels of gold and silver will be
produced. Such estimates are expressions of judgment based on
knowledge, mining experience, analysis of drilling results and
industry practices. Valid estimates made at a given time may
significantly change when new information becomes available. While
the Company believes that the resource estimates included in this
press release and the Los Azules PEA are well established, by their
nature, resource estimates are imprecise and depend, to a certain
extent, upon statistical inferences which may ultimately prove
unreliable. If such estimates are inaccurate or are reduced in the
future, this could have a material adverse impact on the Company.
In addition, the Los Azules PEA and this news release includes
inferred resources that are too speculative geologically to have
economic considerations applied to them that would enable them to
be categorized as mineral reserves, and there is no certainty that
the Los Azules PEA will be realized.
Cautionary Note to U.S. Investors:
McEwen Mining reports its resource estimates in accordance with
standards of the Canadian Institute of Mining, Metallurgy and
Petroleum referred to NI 43-101. These standards are different from
the standards generally permitted in reports filed with the SEC.
Under NI 43-101, McEwen Mining reports measured, indicated and
inferred resources, measurements which are generally not permitted
in filings made with the SEC. According to Canadian NI 43-101
criteria, the estimation of measured resources and indicated
resources involve greater uncertainty as to their economic
feasibility than the estimation of proven and probable reserves.
Under SEC Industry Guide 7 criteria, measured, indicated and
inferred resources are considered Mineralized Material. The SEC
considers that in addition to greater uncertainty as to the
economic feasibility of Mineralized Material compared to proven and
probable reserves, there is also greater uncertainty as to the
existence of Mineralized Material. U.S. investors are cautioned not
to assume that measured or indicated resources will be converted
into economically mineable reserves. The estimation of inferred
resources involves far greater uncertainty as to their existence
and economic viability than the estimation of other categories of
resources.
Caution Concerning Forward-Looking Statements
This press release contains certain forward-looking statements
and information, including "forward- looking statements" within the
meaning of the Private Securities Litigation Reform Act of 1995.
The forward-looking statements and information expressed, as at the
date of this press release, McEwen Mining Inc.'s (the "Company")
estimates, forecasts, projections, expectations or beliefs as to
future events and results. Forward-looking statements and
information are necessarily based upon a number of estimates and
assumptions that, while considered reasonable by management, are
inherently subject to significant business, economic and
competitive uncertainties, risks and contingencies, and there can
be no assurance that such statements and information will prove to
be accurate. Therefore, actual results and future events could
differ materially from those anticipated in such statements and
information. Risks and uncertainties that could cause results or
future events to differ materially from current expectations
expressed or implied by the forward-looking statements and
information include, but are not limited to, risks related to
business integration as a result of the business combination
between US Gold and Minera Andes, factors associated with
fluctuations in the market price of precious metals, mining
industry risks, political, economic, social and security risks
associated with foreign operations, risks associated with the
construction of mining operations and commencement of production
and the projected costs thereof, risks related to litigation
including specifically but not limited to ongoing litigation with
respect to the Los Azules property which if resolved adversely to
the Company, would materially affect the Company's ability to
develop the Los Azules Project, property title, the state of the
capital markets, environmental risks and hazards, uncertainty as to
calculation of mineral resources and reserves and other risks.
Readers should not place undue reliance on forward-looking
statements or information included herein, which speak only as of
the date hereof. The Company undertakes no obligation to reissue or
update forward-looking statements or information as a result of new
information or events after the date hereof except as may be
required by law. See McEwen Mining's Annual Report on Form 10-K for
the fiscal year ended December 31, 2011 and other filings with the
Securities and Exchange Commission, under the caption "Risk
Factors", for additional information on risks, uncertainties and
other factors relating to the forward-looking statements and
information regarding the Company. All forward-looking statements
and information made in this news release are qualified by this
cautionary statement.
The NYSE and TSX have not reviewed and do not accept
responsibility for the adequacy or accuracy of the contents of this
news release, which has been prepared by management of McEwen
Mining Inc.
Contacts: McEwen Mining Inc. Jenya Meshcheryakova Investor
Relations (647) 258-0395 ext 410 or Toll Free: (866) 441-0690 (647)
258-0408 (FAX) McEwen Mining Inc. Mailing Address 181 Bay Street
Suite 4750 Toronto, ON M5J 2T3 PO Box 792info@mcewenmining.com
Facebook: www.facebook.com/McEwenRob Twitter:
www.twitter.com/McEwenMining
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