MAG Silver Reports on the Juanicipio Joint Venture

VANCOUVER, BRITISH COLUMBIA, Jul 10 (MARKET WIRE) --
MAG Silver Corp. (TSX: MAG)(NYSE Amex: MVG) ("MAG") is pleased to provide
an update from the June quarterly Technical Committee meeting of Minera
Juanicipio SA, a joint venture between Fresnillo Plc and MAG. In addition
assay results are reported for three definition drill holes along the
Valdecanas Vein and one exploration hole recently completed on the
Juanicipio Vein. The joint venture continues to execute the 2009 program
where presently there are 4 drills turning. Preliminary engineering
studies and detailed metallurgical work are also progressing.

The Juanicipio Joint Venture held its regularly scheduled quarterly
Technical Committee meeting on June 18, 2009 to review progress on the
2009 program. To date, Joint Venture expenditures amount to $US1.6
million and Fresnillo, as the operator, has completed 9,592 meters of
drilling. This represents 40% of the proposed drilling for the year, with
both drilling and expenditures consistent with that expected to the end
of May.

Drilling has included 6,032 meters on the Valdecanas Vein, 3,028 meters
on the Juanicipio Vein and almost 500 meters on the Encino Vein where
ground conditions continue to prove frustratingly difficult. The
committee is considering a proposal to be presented to the Minera
Juanicipio Board for review and possible approval, whereby an additional
8,000 meters of drilling would be directed to the Valdecanas Vein to
maximize conversion from inferred to indicated resources.

Wardrop Engineering provided an updated draft report of the Scoping Level
Study (43-101) directed at a stand alone scenario for the Valdecanas
Vein. Fresnillo has already given Wardrop commentary and recommendations
on the report based on local experience operating in Mexico, and MAG is
preparing its observations, with final results expected before the end of
the third quarter.

Assay results have been received for four recent holes drilled on the
joint venture holdings. Three of the holes were drilled as part of the
planned 2009 infill drilling program designed to define the Valdecanas
Vein on one hundred meter centres as well as define the upper limit of
the Bonanza Zone. The remaining hole was an exploration hole drilled on
the Juanicipio Vein.

The most important results from this series are from Hole PE2, drilled on
the east-central portion of the Valdecanas vein. The assays report a high
grade silver and gold intercept of 8.85 meters (8.02 meters true width)
carrying 448 grams per tonne silver (13.1 ounces per ton (opt)), 5.70 g/t
gold (0.17 opt), 1.68% lead and 4.21% zinc.

Holes PC and JB were drilled to define the top of the bonanza zone and
returned values consistent with expectations for intersections just above
the zone (see table below for details).

The fourth hole drilled, Hole 21P was on the Juanicipio Vein and this
hole intersected the vein almost 150 meters east of hole 20P and about 45
meters higher in elevation. Results are consistent with earlier results
at this elevation and details are included in the table below.

Drilling has now tracked the Juanicipio Vein for over 1 kilometre along
strike, with textures and metal values indicating that the vein is being
cut at a high level, potentially comparable to the irregular uppermost
portions of the Valdecanas Vein (Note zone above about 1800m elevation on
Long Section below). Results to date indicate that the "top out" of the
Juanicipio Vein lies at an elevation 100 to 150 metres deeper than that
seen in the Valdecanas Vein, so the next series of planned holes have
been redesigned to seek the heart of the Bonanza Zone 100-200 metres
deeper.

Table 1
--------------------------------------------------------------------------
True
Hole Width Silver Silver Gold Lead Zinc Width
No Vein From To Metres g/t opt g/t % % Metres
--------------------------------------------------------------------------

PE2 Valdecanas 652.10 660.95 8.85 448 13.1 5.70 1.68 4.21 8.02
--------------------------------------------------------------------------

Inc. 652.10 656.10 4.00 561 16.4 12.13 1.48 3.43 3.43
--------------------------------------------------------------------------

PC Valdecanas 580.35 581.45 1.10 92 2.7 0.28 0.03 0.19 0.95
--------------------------------------------------------------------------

JB Valdecanas 626.55 628.65 2.10 78 2.3 0.14 0.01 0.08 2.07
--------------------------------------------------------------------------

21P Juanicipio 781.90 782.60 0.70 66 1.9 0.36 0.00 0.01 0.70
--------------------------------------------------------------------------

The overall 2009 exploration program proposes a minimum of 24,000
metres of drilling focused on the Valdecanas Vein, Juanicipio Vein, the
Encino Vein and new exploration targets. The Board also authorized $US
500,000 for development engineering studies. One drill is currently
operating on the Juanicipio Vein, two drills are presently turning on the
Valdecanas Vein and one drill is operating in the Encino area.

Quality Assurance and Control: The samples are shipped directly in
security sealed bags to ALS-Chemex Laboratories preparation facility in
Guadalajara, Jalisco, Mexico (Certification ISO 9001). Samples shipped
also include intermittent standards and blanks. Pulp samples are
subsequently shipped to ALS-Chemex Laboratories in North Vancouver,
Canada for analysis. Two extra pulp samples are also prepared and are
analyzed (in progress) by SGS Laboratories (Certification ISO 9001) and
Inspectorate Laboratories (Certification ISO 9001) (or other recognized
lab). The bulk reject is subsequently sent to CIDT (Center for
Investigation and Technical Development) of Penoles in Torreon, Mexico
for metallurgical testing where a fourth assay for each sample is
analyzed and a calculated head grade is received on the basis of a
concentrate balance. The CIDT also does a full microscopic, XRF and XRD
mineralogical analysis.

Qualified Person: Dr. Peter Megaw, Ph.D., C.P.G., has acted as the
qualified person as defined in National Instrument 43-101 for this
disclosure and supervised the preparation of the technical information in
this release. Dr. Megaw has a Ph.D. in geology and more than 20 years of
relevant experience focussed on silver and gold mineralization, and
exploration and drilling in Mexico. He is a certified Professional
Geologist (CPG 10227) by the American Institute of Professional
Geologists and an Arizona registered geologist (ARG 21613). Dr. Megaw is
not independent as he is a Director and Shareholder of MAG and is a
vendor of one project, other than Juanicipio, whereby he may receive
additional shares. Dr. Megaw is satisfied that the results are verified
based on an inspection of the core, a review of the sampling procedures,
the credentials of the professionals completing the work and the visual
nature of the silver and base metal sulphides within a district where he
is familiar with the style and continuity of mineralization.

About the Joint Venture

The 8,000 hectare Juanicipio property is located in Zacatecas State,
Mexico just outside the mining town of Fresnillo. The Fresnillo mine area
has been in continuous production since the 1500's and today is host to
the world's largest producing primary silver mine operated by Fresnillo
plc. The Fresnillo/MAG Juanicipio Joint Venture lies 5 kilometres west
from the principal production head-frame of the Fresnillo Mine and 1.5
kilometres west from the Saucito Vein, currently undergoing preproduction
development with construction of a 600 metre shaft and a 2,200 metre
decline. Fresnillo operates the delineation and exploration program on
behalf of the joint venture company, Minera Juanicipio S.A. DE C.V.

About MAG Silver Corp. (www.magsilver.com)

MAG is focused on district scale projects located within the Mexican
Silver Belt. Our mission is to become one of the premier companies in the
silver mining industry. MAG and its partner Fresnillo plc are delineating
a significant new silver vein discovery on the Juanicipio property in
Zacatecas State, Mexico. MAG has also identified a new silver, lead and
zinc discovery at its 100% owned Cinco de Mayo property. MAG is based in
Vancouver, British Columbia, Canada. Its common shares trade on the TSX
under the symbol MAG and on the NYSE Amex under the symbol MVG.

On behalf of the Board of MAG SILVER CORP.

Dan MacInnis, President and CEO

This release includes certain statements that may be deemed to be
"forward-looking statements" within the meaning of the US Private
Securities Litigation Reform Act of 1995. All statements in this release,
other than statements of historical facts are forward looking statements,
including statements that address future mineral production, reserve
potential, exploration drilling, exploitation activities and events or
developments. Forward-looking statements are often, but not always,
identified by the use of words such as "seek", "anticipate", "plan",
"continue", "estimate", "expect", "may", "will", "project", "predict",
"potential", "targeting", "intend", "could", "might", "should", "believe"
and similar expressions. These statements involve known and unknown
risks, uncertainties and other factors that may cause actual results or
events to differ materially from those anticipated in such
forward-looking statements. Although MAG believes the expectations
expressed in such forward-looking statements are based on reasonable
assumptions, such statements are not guarantees of future performance and
actual results or developments may differ materially from those in the
forward-looking statements. Factors that could cause actual results to
differ materially from those in forward-looking statements include, but
are not limited to, changes in commodities prices, changes in mineral
production performance, exploitation and exploration successes, continued
availability of capital and financing, and general economic, market or
business conditions, political risk, currency risk and capital cost
inflation. In addition, forward-looking statements are subject to various
risks, including that data is incomplete and considerable additional work
will be required to complete further evaluation, including but not
limited to drilling, engineering and socio-economic studies and
investment. The reader is referred to the Company's filings with the SEC
and Canadian securities regulators for disclosure regarding these and
other risk factors. There is no certainty that any forward looking
statement will come to pass and investors should not place undue reliance
upon forward-looking statements. Cautionary Note to U.S. Investors: The
U.S. Securities and Exchange Commission permits U.S. mining companies, in
their filings with the SEC, to disclose only those mineral deposits that
a company can economically and legally extract or produce. We use certain
terms in this press release, such as "Inferred resources", that the SEC
guidelines prohibit U.S. registered companies from including in their
filings with the SEC.

Please Note:

Investors are urged to consider closely the disclosures in MAG's annual
and quarterly reports and other public filings, accessible through the
Internet at www.sedar.com and
www.sec.gov/edgar/searchedgar/companysearch.html.

To view accompanying maps, please click on the following link:
http://media3.marketwire.com/docs/MAGMaps.pdf

Neither the Toronto
Stock Exchange nor the New York Stock Exchange Alternext US LLC has
reviewed or accepted responsibility for the accuracy or adequacy of this
news release, which has been prepared by management.

Contacts:
MAG Silver Corp.
Gordon Neal
VP Corp. Development
(604) 630-1399 or Toll free: (866) 630-1399
(604) 484-4710 (FAX)
info@magsilver.com
www.magsilver.com

Fresnillo plc
Octavio Alvidrez
Investor Relations
52 (55) 5279 3250 or 011-44-207-399-2470
52 (55) 5279 3217 or 011-44-207-399-2471 (FAX)
om_alvidrez@fresnilloplc.com
www.fresnilloplc.com

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