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Excelsior Mining Corp.: Hydrology Tests Confirms Suitable Conditions for In-Situ Recovery at Gunnison Project

06.09.2011  |  DGAP
Excelsior Mining Corp. (TSX-V: MIN) (Frankfurt: 3XS) (OTCQX: EXMGF)
('Excelsior') is pleased to announce results from two comprehensive
hydrological tests conducted at the North Star Deposit. The results
generated hydrological conductivities in the range expected for a fractured
deposit and show the deposit is suitable for in-situ recovery (ISR). The
North Star Deposit is part of the Gunnison Copper Property located within
the copper porphyry belt in southern Arizona.

'We are very pleased with the results from this initial hydrological
testing. We have successfully achieved another milestone in demonstrating
suitable hydrological conditions for ISR at the North Star Deposit,' says
Stephen Twyerould, President and CEO of Excelsior. 'These results will be
combined with new metallurgical data to complete a Preliminary Economic
Assessment expected later this year. Further hydrological and metallurgical
testing will be carried out as we continue driving our Project towards
production.'

The North Star Deposit currently contains an indicated oxide copper
resource of 3.21 billion pounds (511 million tons at 0.31% copper) and an
additional inferred oxide copper resource of 0.88 billion pounds (159
million tons at 0.28% copper). For further details on the resource
estimate, please see the news release dated July 19, 2011.

Hydrology Details

Two hydrological tests were completed on holes NSH-01 and NHS-02 and
included pumping and injecting water to measure groundwater parameters,
extensive down hole geophysical logging, geological logging and assaying,
and advanced electrical geophysics. The two new tests complement previous
testing in the late 1990's by Magma Copper Corporation (BHP-Billiton). The
holes are all located in the central portion of the North Star Deposit.

Hydrological conductivities ('K values') are a measure of the efficiency
with which water moves through the rock and are measured as feet per day
(ft/d). NSH-01 had a K value of 0.08 ft/d measured over an interval of 394
feet (from 702 feet to 1,096 feet), representing the screened interval of
the hole. NSH-02 had a K value of 5.9 ft/d measured over an interval of 656
feet (from 608 feet to 1,264 feet). The average K value for the two holes
is approximately 2.9 ft/d. The K values achieved are entirely consistent
with K values from similar ISR projects.

Excelsior's hydrological testing was supervised by Michael W. Bostic, R.G.,
Principal Hydrogeologist from BasinWells Associates, PLLC and a Qualified
Person as defined by NI 43-101. Mr. Bostic has reviewed and is responsible
for the technical information contained in this news release with respect
to the hydrology details. Excelsior's exploration work on the Gunnison
Property is supervised by Stephen Twyerould, Fellow of AUSIMM, President
and CEO of Excelsior and a Qualified Person as defined by NI 43-101. Mr.
Twyerould has reviewed and verified the data disclosed in this news release
with respect to the resource estimate.

About Excelsior

Excelsior is an exploration and development company with a copper project
located within the copper porphyry belt of Arizona. The Gunnison Copper
Project is located close to the required infrastructure and with its
in-situ recovery potential, is intended for near-term production. The
Excelsior team consists of experienced professionals with proven track
records of advancing projects towards production.

Further details about Excelsior can be found at:
http://www.excelsiormining.com. Further information about the Gunnison
Copper Project can be found in the technical report filed on SEDAR at
www.sedar.com entitled: Gunnison Copper Project, Cochise County, Arizona,
USA, Mineral Resource of the North Star dated August 31, 2011.

ON BEHALF OF THE EXCELSIOR BOARD

'Stephen Twyerould'
President & CEO

T: +1 604-681-8030
F: +1 604-681-8039
www.excelsiormining.com

Cautionary Note Regarding Forward-Looking Information
Information set forth in this news release may involve forward-looking
statements under applicable securities laws. Forward-looking statements are
statements that relate to future, not past, events. In this context,
forward-looking statements often address expected future business and
financial performance, and often contain words such as 'anticipate',
'believe', 'plan', 'estimate', 'expect', and 'intend', statements that an
action or event 'may', 'might', 'could', 'should', or 'will' be taken or
occur, or other similar expressions. All statements, other than statements
of historical fact, included herein including, without limitation;
statements about future exploration on and the development of the Gunnison
Project and the ability to mine Gunnison using in-situ recovery mining
techniques are forward-looking statements. By their nature, forward-looking
statements involve known and unknown risks, uncertainties and other factors
which may cause our actual results, performance or achievements, or other
future events, to be materially different from any future results,
performance or achievements expressed or implied by such forward-looking
statements. Such factors include, among others, the following risks: the
need for additional financing; operational risks associated with mineral
exploration; fluctuations in commodity prices; title matters; environmental
liability claims and insurance; reliance on key personnel; the potential
for conflicts of interest among certain officers, directors or promoters
with certain other projects; the absence of dividends; competition;
dilution; the volatility of our common share price and volume and the
additional risks identified the management discussion and analysis section
of our interim and most recent annual financial statement or other reports
and filings with the TSX Venture Exchange and applicable Canadian
securities regulations. Forward-looking statements are made based on
management's beliefs, estimates and opinions on the date that statements
are made and the company undertakes no obligation to update forward-looking
statements if these beliefs, estimates and opinions or other circumstances
should change, except as required by applicable securities laws. Investors
are cautioned against attributing undue certainty to forward-looking
statements.

Neither the TSX Venture Exchange nor its Regulation Services Provider (as
that term is defined in the policies of the TSX Venture Exchange) accepts
responsibility for the adequacy or accuracy of this release, and no
securities regulatory authority has either approved or disapproved of the
contents of this release.


End of Corporate News

Unternehmen: Excelsior Mining Corp. - ISIN: CA3007632084
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