Excelsior
September 6 th , 2011
Excelsior Mining Corp. (TSX-V: MIN) to announce results from two comprehensive The results generated hydrological conductivities in the range expected for a fractured deposit and show the deposit is suitable for in-situ recovery (ISR).
Copper Property located within the copper porp
“We are very pleased with the results from th achieved another milestone in demonstrating Deposit,” says Steph en Twyerould, President and CEO of Excelsior. “with new metallurgical data to complete a Prelimina ry Economic Assessment expected later this year Further hydrological and metallurgical testing will be carried out as we cont towards production.”
The North Star Deposit currently contains (511 million tons at 0.31% copper ) pounds (159 million tons at 0.28% copper).
the news release dated July 19, 2011.
Hydrology Details
Two hydrological tests were completed on holes NSH injecting wate r to measure groundwater parameters geological logging and assaying , and previous testing in the late 1990’s located in the central portion of the http://excelsiormining.com/Projects/GunnisonProject/Hydrology_Map.p
Hydrological conductivities (“K values”) are a measure of the efficiency with w hich water moves through the rock and are measured as feet per day ( ft/d).
measured over an interval of 394 feet of the hole. NSH- 02 had a K value of 5.9 ft/d measured over an inter val of 656 feet 1,264 feet). The average K value for the two holes is approximat ely 2.9 ft/d are entirely consistent with K values from similar ISR projects.
Excelsior’s hydrological testing was supervised by Michael W. Bostic, R.G., Prin from BasinWell s Associates, PLLC reviewed and is responsible for the technical information contained in this news release the hydrology details. Excelsior’s exploration work on the Gunnison Proper ty is supervised by Stephen Twyerould, Fellow of AUSIMM defined by NI 43-101. Mr. Twyerould with respect to the resource estimate.
NEWS RELEASE
Confirms Suitable Conditions for In -Situ Recovery at
Excelsior ’s Gunnison Project (TSX-V: MIN ) (Frankfurt: 3XS) V: MIN) (Frankfurt: 3XS) (OTCQX: EXMGF) (“ Excelsior comprehensive hydrological tests conducted at the North Star Deposit.
generated hydrological conductivities in the range expected for a fractured deposit and situ recovery (ISR). The North Star Deposit is part of the Gunnison the copper porp hyry belt in southern Arizona.
We are very pleased with the results from th is initial hydrological testing. We demonstrating suitable hydrological conditions for ISR en Twyerould, President and CEO of Excelsior. “ These results with new metallurgical data to complete a Prelimina ry Economic Assessment expected later this year Further hydrological and metallurgical testing will be carried out as we cont inue driving our Project North Star Deposit currently contains an indicated oxide copper resource of 3.21 billion pounds) and an additional inferred oxide copper resource of (159 million tons at 0.28% copper). For further details on the resource estimate, please see the news release dated July 19, 2011.
Two hydrological tests were completed on holes NSH -01 and NHS- 02 and included p r to measure groundwater parameters , extensive down hole geophysical logging, and advanced electrical geophysics . The two new tests in the late 1990’s by Magma Copper Corporation (BHP- Billiton).
located in the central portion of the North Star D eposit as shown in the figure at: http://excelsiormining.com/Projects/GunnisonProject/Hydrology_Map.p df (“K values”) are a measure of the efficiency with w hich 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 02 had a K value of 5.9 ft/d measured over an inter val of 656 feet The average K value for the two holes is approximat ely 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., Prin cipal Hydrogeologist s Associates, PLLC and a Qualified Person as defined by NI 43- 101.
responsible for the technical information contained in this news release Excelsior’s exploration work on the Gunnison Proper ty is supervised by of AUSIMM , President and CEO of Excelsior and a Qualified Person as Twyerould has reviewed and verified the data disclosed in this news release with respect to the resource estimate.
Situ Recovery at) (Frankfurt: 3XS) (OTCQX: EXMGF) Excelsior ”) is pleased North Star Deposit.
generated hydrological conductivities in the range expected for a fractured deposit and The North Star Deposit is part of the Gunnison We have successfully suitable hydrological conditions for ISR at the North Star These results will be combined with new metallurgical data to complete a Prelimina ry Economic Assessment expected later this year . inue driving our Project 3.21 billion pounds resource of 0.88 billion on the resource estimate, please see 02 and included p umping and extensive down hole geophysical logging ,. The two new tests complement Billiton). The holes are all eposit as shown in the figure at: (“K values”) are a measure of the efficiency with w hich water moves 01 had a K value of 0.08 ft/d, representing the screened interval 02 had a K value of 5.9 ft/d measured over an inter val of 656 feet (from 608 feet to The K values achieved cipal Hydrogeologist 101. Mr. Bostic has responsible for the technical information contained in this news release with respect to Excelsior’s exploration work on the Gunnison Proper ty is supervised by Qualified Person as the data disclosed in this news release 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 intende d for near-term production. The Excelsior team consists of experienced professionals with proven t rack 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 t he 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: 604-681-8030
F: 604-681-8039 www.excelsiormining.com
Cautionary Note Regarding Forward-Looking Information
Information set forth in this news release may invo lve forward-looking statements under applicable sec urities laws. Forward-looking statements are statements that relate to future, no t past, events. In this context, forward-looking st atements often address expected future business and financial performance, and often conta in 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 ab out future exploration on and the development of the Gunnison Project and the ability to mine Gunnison using in-situ recovery mining tec hniques are forward-looking statements. By their nature, forward-looking statem ents 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 fr om 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 per sonnel; the potential for conflicts of interest amo ng certain officers, directors or promoters with certain other projects; the absence of dividen ds; competition; dilution; the volatility of our co mmon 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 a nd applicable Canadian securities regulations. Forw ard-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 shou ld 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 fo r the adequacy or accuracy of this release, and no securities regulatory authority has either approved or disapproved of the contents of this release.