Minera Andes announces a new discovery from the 2009 San José exploration program

    TSX: MAI                                               NASD-OTCBB: MNEAF

    SPOKANE, WA, April 23 /CNW/ - Minera Andes Inc. (TSX: MAI and US OTC:
MNEAF) is pleased to announce details of the 2009 exploration program underway
at its producing high-grade gold/silver San José Mine in southern Argentina.
The San José project is owned by Minera Santa Cruz S.A. ("MSC") and MSC is
owned 49% by Minera Andes and 51% by Hochschild Mining plc ("Hochschild")
(HOCM.L: Reuters and HOC LN: Bloomberg - London Stock Exchange), the operator.
Exploration highlights include the discovery of a new mineralized structure
about 845 meters southwest of the producing Huevos Verdes vein. The structure,
which does not outcrop on the surface, was discovered in the first hole of a
program of several 1,000 meter long diamond drill holes to be drilled
horizontally from existing underground workings. Core hole (SMJ-105)
intersected 8.9 g/t (0.26 ounces per tonne - opt) gold and 517 g/t (15.1 opt)
silver over 1.00 meters. For details, see attached maps:


    The 2009 exploration program at San José consists of a compilation and
interpretation of project data over the entire San José district, comprising
approximately 115 km(2) (28,400 acres), to identify new targets and follow up
on existing targets through exploration drilling. The planned drilling program
totals approximately 22,000 meters made up of 17,000 meters of core drilling
from the surface and 5,000 meters of underground drilling. The surface
drilling will focus on the Kospi, Ayelén, Odin, and the newly discovered
structure. Underground drilling will concentrate on the Kospi, Frea, Huevos
Verdes Central veins as well as other veins by drilling from the underground
access ramps. In addition to discovering new mineralized veins, the goal of
this year's exploration program will be to add to the existing resources at
San José.
    The new mineralized quartz vein structure was discovered in the first
drill hole of the underground exploration program in the San José mine. The
first phase of the underground drilling program consists of five 1,000-meter
long, horizontal holes to test various geophysical targets outside the current
mining areas in order to evaluate possible sub-parallel structures. Drill hole
JM-105, directed towards a high-resistivity anomaly to the southwest of the
Huevos Verdes vein, intersected the structure at 845m yielding 8.9 g/t Au and
517 g/t Ag over 1.0 meter width. A follow-up surface drilling program to test
the continuity of this recent discovery is in preparation. The current five
long-hole underground program continues with a second horizontal hole
currently being drilled in a northeast direction from the Huevos Verdes vein.
    Allen Ambrose, president of Minera Andes said, "We are pleased to see the
excellent discovery potential at San José with the first drill hole from this
year's exploration program meeting with success. This further indicates the
district scale potential of the property to host multiple gold/silver veins.
Since the Huevos Verdes vein was discovered on the property four additional
high-grade gold/silver veins have been found with a potential fifth vein in
the new structure."
    Assay results for the drilling were reviewed by Allen V. Ambrose, Minera
Andes' President and CEO, who is an appropriately qualified person as defined
by National Instrument 43-101. All samples were collected in accordance with
industry standards. Assay results disclosed herein are generated from the
in-house laboratory at the San Jose mine site. Splits and check samples from
the drill core samples were submitted to Alex Stewart Assayers, Argentina,
S.A., in Mendoza, Argentina, for fire assay and ICP analysis and assay results
are pending. Accuracy of results is tested through the systematic inclusion of
standards, blanks and check assays.
    Allen V. Ambrose, Minera Andes' CEO and President, who is a "qualified
person" as defined by National Instrument 43-101, is responsible the
information used in this news release and has supervised the preparation of
the information and reviewed all information used in this news release.

    Minera Andes is a gold, silver and copper exploration company working in
Argentina. The Corporation holds or has an interest in approximately 304,000
acres of mineral exploration land in Argentina, including the properties
comprising the 49% owned San José silver/gold mine. Minera Andes is also
exploring the Los Azules copper project in San Juan province, where a scoping
study has been completed and a 43-101 technical report filed. Other
exploration properties, primarily silver and gold, are being evaluated in
southern Argentina. The Corporation presently has 230,538,851 shares issued
and outstanding.
    This news is submitted by Allen V. Ambrose, CEO, President and Director
of Minera Andes Inc.

    Caution Concerning Forward-Looking Statements:

    This news release contains forward-looking statements and forward-looking
information within the meaning of applicable US and Canadian securities laws.
Such forward-looking statements or information include expected production at
MSC's San José Project. In making the forward-looking statements and providing
the forward-looking information, we have made numerous assumptions. Although
our management believes that the assumptions made and the expectations
represented by such statements or information are reasonable, there can be no
assurance that the forward-looking statements will prove to be accurate.
Forward-looking statements and information involve known and unknown risks,
uncertainties and other factors that may cause our actual results to be
materially different from that expressed or implied by such forward-looking
information. Such risks, uncertainties and other factors include among other
things, declines in the price of gold, silver, copper and other base metals,
capital and operating cost increases, changes in general economic and business
conditions, including changes in interest rates and the demand for base
metals, economic and political instability in Argentina, discrepancies between
actual and estimated production and mineral reserves and resources;
operational and development risk; the speculative nature of mineral
exploration and regulatory risks.
    Readers should not place undue reliance on forward-looking statements or
information. We undertake 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 our annual information form
for additional information on risks, uncertainties and other factors relating
to the forward-looking statements and information. All forward-looking
statements and information made in this news release are qualified by this
cautionary statement. Minera Andes' joint venture partner, a subsidiary of
Hochschild Mining plc, and its affiliates do not accept responsibility for the
use of project data or the adequacy or accuracy of this release.

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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