Sterling Mining Company
OTC Bulletin Board : SRLM
FRANKFURT : SMX

Sterling Mining Company

September 24, 2007 10:51 ET

Sterling Mining 43-101 Technical Report on the Sunshine Mine

WALLACE, IDAHO--(Marketwire - Sept. 24, 2007) - Sterling Mining Company (OTCBB:SRLM)(FRANKFURT:SMX) (the "Company") is pleased to release a summary of the final results of a report entitled "Technical Report on the Sunshine Mine, Big Creek, Idaho, U.S.A." as prepared for the Company by Behre Dolbear & Company, Inc. (the "43-101 Report"). The 43-101 Report reported on the Company's re-opening of the Sunshine Mine to return the mine to production.

The full text of the 43-101 Report may be found on the Company's website at www.sterlingmining.com, or at www.sedar.com by following the link to the filings of the Company in Canada.

Raymond De Motte, President stated "The 43-101 Report was part of our regulatory process in becoming conditionally approved for listing on the TSX; it validates our work and the merits of our property, and our return to production plan at the Sunshine Mine."

Background to the 43-101 Report

The 43-101 Report was prepared in compliance with National Instrument 43-101 ("NI 43-101") of the Canadian Securities Administrators entitled "Standards of Disclosure for Mineral Projects". This report is in conjunction with the Company's application to list its common shares on the Toronto Stock Exchange. The Company has received conditional approval (see press release dated August 2, 2007), and the finalization of a non-offering prospectus with the Ontario Securities Commission, which was required as a part of the Company's January, 2007 private placement financing so as to allow the Company to become a reporting issuer in Ontario (see press release dated January 19, 2007). A receipt for that final prospectus was issued by the Ontario Securities Commission on August 10, 2007.

Mineral Resource/Reserve Estimation

The Sunshine Mine resource estimates, as set out in the table below, are mainly based on historical drilling and from data compiled by the Company. The historical resource estimates were used by Behre Dolbear in an October 2006 feasibility study to estimate the mineral reserves; subsequent to that estimation a further resource estimation based on historical data was made on February 2007 by Dr. Warren Geiger P.Eng. The historical data, on which the current estimates have been made, is well documented but has not been completely verified, so readers are duly cautioned that these historical data based estimates cannot be fully relied on.



The estimated Sunshine Mine resources are stated in the table below.

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Sunshine Mine Mineral Resources
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Ag. Grade
Source Block Count Tons (opt) Ag. Ounces
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Measured 43 276,975 24.1 6,664,217
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Indicated 297 1,151,438 21.3 24,490,138
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Total 340 1,428,413 21.8 31,154,355
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Based on the above, Behre Dolbear reported, based on their feasibility analysis, that there are Proven and Probable reserves present at the property. The contained ounces in these reserves include a 15% mine recovery loss deduction and are stated in the table below.



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Sunshine Mine Reserves
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Reserve Category Short Tons Grade oz/t Ag Ounces
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Proven 1,049,396 22.1 23,237,689
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Probable 11,577 21.5 249,009
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Total 1,060,973 22.1 23,486,698
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Inferred Resources

Sterling has also identified locations within the mine plan that have resource potential from drilling or mining data to support estimates of tons and grade, but have less geologic confidence than the measured and indicated mineral resources. This material is identified as an inferred mineral resource, moving from greater to lower reliability.

Sterling has evaluated the data in the mine's veins and has defined mineralized blocks with estimated tons and potential ounces of silver. The volume is calculated for these projections and tonnage is calculated using a vein tonnage factor of 8.3. Ounces are derived by using an estimated mean vein grade of the log normal distribution for a given vein.

These inferred resources are shown in the table below. These figures include only the estimated tonnage and grade of the vein material, unlike the measured and indicated resources above, which include in their estimation the dilution and mining loss that will be produced from the appropriate stoping method. As the vein material estimates do not include dilution or mining loss, the result is the apparently high resource grade.



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Sunshine Mine Inferred Resources
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Vein Tons Grade oz/t Ounces
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Sunshine 216,729.3 75.0 16,254,699
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Syndicate 489,347.5 110.1 53,879,768
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Chester 512,277.4 98.1 50,238,073
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Yankee Girl 893,072.1 105.7 94,403,708
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Copper 167,520.7 100.0 16,752,065
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Totals 2,278,947.1 101.6 231,528,312
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Project Economics

The 43-101 Report also details economics of the Sunshine Mine, based only a 7 year mine plan that fully mines all of the Proven and Probable reserve as stated above. NI 43-101 prohibits disclosing an economic analysis that includes Inferred Resources, which may be accessed s noted above.

Cautionary Notes

(1) Cautionary note to US investors concerning estimates of Measured, Indicated and Inferred Resources. US investors are advised that use of the terms "Measured Resource", "Indicated Resource. and "Inferred Resource" are recognized and required by Canadian Securities regulations. These terms are not recognized by the U.S. Securities and Exchange Commission. U.S. investors are cautioned not to assume that all or any part of mineral deposits in these categories will ever be converted into reserves.

(2) Resources, unlike reserves, do not have demonstrated economic viability. Mineral resources are subject to infill drilling, permitting, mine planning, mining dilution, metallurgy and recovery environmental, economic and other relevant factors in order to be converted into mineral reserves. Due to the uncertainty which may attach to mineral resources, it cannot be assumed that all or part of a Resource will be upgraded to a Reserve when subject to a Feasibility Study.

(3) Inferred Resources are based on limited sampling and unverified geological and grade continuity and unlike reserves, do not have demonstrated economic viability. Due to the uncertainty which may attach to Inferred mineral resources, it cannot be assumed that all or part of an Inferred Resource will be upgraded to Indicated or Measured Resources with continued exploration.

About Sterling Mining Company

Sterling Mining controls the Sunshine Mine, currently forecasted to begin production in December 2007, and related exploration lands in the prolific Silver Valley of northern Idaho. The Company also holds several silver properties in Mexico, including the Barones Tailings Project in the Zacatecas Silver District. Shares of Sterling Mining Company trade on the OTC Bulletin Board under the symbol "SRLM" and also on the Frankfurt Stock Exchange under the trading symbol "SMX".

To receive Sterling news via email, please email julia@chfir.com and specify "SRLM news" in the subject line.

Cautionary Language and Forward Looking Statements

This press release may contain "forward-looking statements", which are subject to various risks and uncertainties that could cause actual results and future events to differ materially from those expressed or implied by such statements. Investors are cautioned that such statements are not guarantees of future performance and results. Risks and uncertainties about the Company's business are more fully discussed in the Company's disclosure documents filed from time to time with the Canadian securities authorities

This press release does not constitute an offer to sell or a solicitation to buy securities, and contains forward-looking statements regarding the Company within the meaning of Section 27A of the Securities Act and Section 21E of the Exchange Act. These statements are based on assumptions that the Company believes are reasonable but that are subject to uncertainties and business risks. Actual results relating to any and all of these subjects may differ materially from expected results. Along with additional underground rehabilitation and restoration of site facilities, the timetable for the continuing work program anticipates production beginning in December 2007. If we are able to stay on schedule with the mine work and obtain the funding, equipment, and qualified operations personnel as needed for the work program, we believe production by December is doable. Factors that could cause results to differ materially include economic and political events, the ability to raise capital in the financial markets, and other factors discussed in the Company's periodic filings with the Securities and Exchange Commission, including its annual report on Form 10-K for the year ended December 31, 2006 and subsequent 10-Q and 8-K filings.

Contact Information

  • Sterling Mining Company
    Raymond De Motte
    President
    (208) 699-6097
    or
    Sterling Mining Company
    Monique Hayes
    Marketing/Communications
    (208) 699-6097
    Website: www.SterlingMining.com
    or
    CHF Investor Relations
    Cathy Hume
    CEO
    (416) 868-1079 x231
    Email: cathy@chfir.com
    Website: www.chfir.com