Minera Andes announces excellent metallurgical testing results for Los Azules

    TSX: MAI

    SPOKANE, WA, Sept. 25 /CNW/ - Minera Andes Inc. (TSX: MAI and US OTC:
MNEAF) is pleased to announce the receipt of excellent results from the
metallurgical testing program completed as part of the Los Azules Project
43-101 Preliminary Assessment (scoping study) planned for completion by
yearend. The test results show that the Los Azules ore material is amenable to
conventional flotation recovery methods and that the overall metal recoveries
and the copper concentrate grades are high.
    The following table shows the metal recoveries and the amount of metal
recovered into concentrate in the locked cycle flotation tests for all three
composite samples are as follows:

                                                   Metal in
    Sample      Ore Type            Head Grade   Concentrate  Metal Recovery
    Composite                    Cu     Au    Ag  Cu    Au    Ag  Cu  Au  Ag
                                 (%)  (g/t) (g/t) (%) (g/t) (g/t) (%) (%) (%)
    1         Strong Enriched
               Sulfide          0.85  0.094  2.7   34  2.7   101  92  56  70
    2         Weak Enriched
               Sulfide          0.55  0.087  1.7   30  3.9    80  93  66  62
    3         High-grade
               Primary Sulfide  1.55  0.125  4.0   33  2.4    84  93  74  84

    Allen Ambrose, president of Minera Andes, said: "The positive
metallurgical testing program shows that standard reagents and flotation
methods can be used at Los Azules to produce a high quality saleable
concentrate. Copper recoveries over 92% and copper concentrate grades over 30%
copper indicate that flotation concentration would be the preferred process
for all ore types, which are of medium hardness for grinding. Gold and silver
grades are also sufficient to contribute payable precious metals to the
    The metallurgical tests were conducted on three composite samples
collected from recent drilling campaigns at Los Azules, including core from
the latest 2007-2008 season. The three composites were identified as strong
enriched sulfide ore, weak enriched sulfide ore, and high-grade primary
sulfide ore. The strong enriched sulfide composite showed potential for
recovery of 75% of the copper by acid leach. Concentrate arsenic content was
0.22% or below for all ore types. Concentrate from the strong enriched sulfide
composite contained 2.4% zinc compared to less than 1% for the other ore
types. Other metals in the concentrates were below penalty limits.
    The metallurgical test work was carried out by laboratory C.H. Plenge &
Cia in Lima, Peru under the direction of Samuel Engineering. The program was
designed to determine the crushing, grinding and flotation characteristics of
the primary and secondary (enriched) sulphide ore types found at Los Azules
that are representative of the current NI 43-101 compliant resource estimate.
The test data will be used by Samuel Engineering to develop a process
flowsheet, to identify further testing requirements, and to develop capital
and operating costs for the scoping study that is scheduled to be completed in
December of this year.
    Mr. Allen Ambrose, president of Minera Andes, an appropriately Qualified
Person as defined by NI 43-101 for the Los Azules project, has reviewed and
approved the content of this press release.
    Minera Andes is advancing the Los Azules project under an option
agreement (see news release dated November 14, 2007) with Xstrata Copper, one
of the commodity business units within Xstrata plc (London Stock Exchange:
XTA.L and Zurich Stock Exchange: XTRZn.S). The scope and size potential of the
project increased dramatically in 2006 when the Minera Andes drilling
discovered a near surface high-grade area of copper mineralization, when
AZ-06-19 encountered 221 meters of mineralization averaging 1.62% copper that
was 200 meters from hole AZ-06-20 containing 173 meters of 1% copper.

    Minera Andes is a gold, silver and copper exploration company working in
Argentina. The Company holds about 304,000 acres of mineral exploration land
in Argentina including the 49% owned producing San José silver/gold mine. In
addition to exploring the Los Azules copper project in San Juan province other
exploration properties, primarily silver and gold, are being evaluated in
southern Argentina. The Corporation presently has 189,581,335 shares issued
and outstanding.
    This news is submitted by Allen V. Ambrose, President and Director of
Minera Andes Inc.

    Caution Concerning Forward-Looking Statements:

    This press release contains certain "forward-looking statements",
including, but not limited to, the statements regarding the Company's
strategic plans, evolution of mineral resources and reserves, work programs,
development plans and exploration budgets. The forward-looking statements
express, as at the date of this press release, the Company's plans, estimates,
forecasts, projections, expectations or beliefs as to future events and
results. Forward-looking statements involve a number of risks and
uncertainties, and there can be no assurance that such statements will prove
to be accurate. Therefore, actual results and future events could differ
materially from those anticipated in such statements. Risks and uncertainties
that could cause results or future events to differ materially from current
expectations expressed or implied by the forward-looking statements include,
but are not limited to, factors associated with fluctuations in the market
price of base metals, mining industry risks, risks associated with foreign
operations, the state of the capital markets, environmental risks and hazards,
uncertainty as to calculation of mineral reserves, and other risks. Reference
is made to the risk factors and uncertainties described in the Company's
continuous disclosure record, a copy of which is available under the Company's
profile at www.sedar.com.

    Cautionary Note to U.S. Investors:

    The United States Securities and Exchange Commission (the "SEC") permits
mining companies, in their filings with the SEC, to disclose only those
mineral deposits with "mineral reserves" that a company can economically and
legally extract or produce. We use certain terms in this press release, such
as "mineral resources", that the SEC guidelines strictly prohibit us from
including in our filings with the SEC.

For further information:

For further information: Art Johnson at the Spokane office; or Krister
A. Kottmeier, investor relations - Canada, at the Vancouver office; Visit our
Web site: www.minandes.com; Spokane Office, 111 East Magnesium Road, Ste. A,
Spokane, WA, 99208, USA, Phone: (509) 921-7322, E-mail: info@minandes.com;
Vancouver Office, 911-470 Granville Street, Vancouver, B.C., V6C 1V5, Phone:
(604) 689-7017, (877) 689-7018, E-mail: ircanada@minandes.com

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