Standard Gold Mine

Site Name

Primary: Standard Gold Mine
Secondary: Gold Standard
Secondary: Standard
Secondary: Lally
Secondary: Cordex
Secondary: South Pit
Secondary: North Pit
Secondary: Star
Secondary: Buffalo Canyon

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Commodity

Primary: Gold
Primary: Silver
Tertiary: Arsenic
Tertiary: Barium-Barite

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Location

State: Nevada
County: Pershing
District: Rye Patch District

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Land Status

Land ownership: BLM Administrative Area
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.
Administrative Organization: WInnnemucca BLM District

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Holdings

Not available

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Workings

Type: Underground

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Ownership

Owner Name: Pacific Syndicate
Years: 1936 -

Owner Name: Apollo Gold Corporation
Info Year: 2004

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Production

Year: 1951
Time Period: 1932-1951
Material type: AU
Description: Cp_Grade: ^2.7 Grams Au Per Metric Ton

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Deposit

Record Type: Site
Operation Category: Producer
Deposit Type: sediment-hosted disseminated gold
Operation Type: Surface-Underground
Year First Production: 1939
Year Last Production: 1949
Discovery Year: 1932
Years of Production:
Organization:
Significant: Y
Deposit Size: M

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Physiography

Not available

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Mineral Deposit Model

Model Name: Sediment-hosted Au

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Orebody

Not available

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Structure

Type: L
Description: The rocks in the area have been subjected to three periods of thrust faulting; intense folding of sediments in upper plates of thrust faults; normal faulting.

Type: R
Description: Regional thrust faulting

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Alterations

Alteration Type: L
Alteration Text: Strong silicification of host rock.

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Rocks

Name: Limestone
Role: Host
Age Type: Host Rock
Age Young: Late Triassic
Age Old: Middle Triassic

Name: Tuff
Role: Associated
Description: air-fall
Age Type: Associated Rock
Age Young: Permian

Name: Phyllite
Role: Associated
Age Type: Associated Rock
Age Young: Late Triassic

Name: Limestone
Role: Associated
Age Type: Associated Rock
Age Young: Late Triassic
Age Old: Middle Triassic

Name: Rhyolite
Role: Associated
Age Type: Associated Rock
Age Young: Permian

Name: Phyllite
Role: Host
Age Type: Host Rock
Age Young: Late Triassic

Name: Argillite
Role: Host
Age Type: Host Rock
Age Young: Late Triassic

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Analytical Data

Not available

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Materials

Ore: Gold
Gangue: Barite

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Comments

Comment (Development): The Standard mine was owned by Pacific Syndicate in 1936, when reported on by Vanderburg. The Standard Mine was active from1939-42 and 1946-49. Approximately 680,000 metric tons of ore were mined from 2 pits (Gold Standard and Lally pits) about 650 m apart. Ore grade averaged 2.7 grams per metric ton. The ore was processed through a 544 metric ton per day cyanide mill with recoveries on the order of 92-95% from a coarse grind. In 1949, increased cost and slope failure in the south pit forced the Standard Cyaniding Company to close the mine. Cordex Exploration Company initiated an exploration program in 1981 to identify additional mineralized areas near the site of the Standard Mine. Geochemical sampling of jasperoid and surrounding rock in both the north and south pits revealed anomalous concentrations of Au, Ag, and As. Even at a distance from the pits, many of the jasperoid bodies were found to contain anomalous levels of Au. The Standard Mine is considered to be the first "Carlin-type" disseminated gold deposit to have been put into production in Nevada. The property was owned by Pegasus Gold Corp. in1984, and later by Florida Canyon Gold MIning Corp., and currently by Apollo Gold Corporation. An exploration program consisting of over 89,000 feet of reverse-circulation drilling was successful in developing several orebodies iscovered within this property in 2002 and adding 318,400 oz of gold in the proven and probable mineral reserve categories. Reverse circulation drilling at the Standard Mine project (including Buffalo Canyon) totaled 25,400 feet drilled in the fourth quarter 2003, with four core holes completed earlier in the year for metallurgical samples. This total includes 61 holes in the South Pit and 15 in the North Pit. These efforts resulted in proven and probable reserves of 404,100 ounces of gold. In 2003 Apollo completed the Phase I exploration drilling program in the Buffalo Canyon area. Buffalo Canyon is a newly acquired property consisting of 480 acres located immediately south and adjacent to the Standard Mine project. A total of 5,040 feet of reverse circulation surface drilling in 13 holes was completed at Buffalo Canyon with encouraging results. In February, 2004, the Standard Mine Project was reported to be in the final permitting stages for an open pit, heap leach mine; to be operated in conjunction with Apollo Gold Corporation?s Florida Canyon Mine four miles to the north. Leach pad construction was expected to be completed late in 2004, with initial gold production forecast for 2005. Buffalo Canyon, adjacent to the Standard Mine, will be operated as a satellite pit sometime after the Standard Mine is brought into production.

Comment (Economic Factors): From 1932 through 1951, the mine production was 46,602 oz Au; 102,721 oz Ag (about 1.45 metric tonnes gold, 3.19 metric tonnes silver) Standard?s reserves as of December 31, 2002 consisted of 17.2 million tons (15.6 million tonnes) at a grade of 0.019 oz gold/ton (0.65 grams gold / tonne), for approximately 318,300 contained ounces of gold. Proven and probable reserves of 404,100 ounces of gold were reported by the end of 2003.

Comment (Geology): A northerly striking normal fault controlled the movement of mineralizing fluids which spread along the youngest thrust fault and formed the south pit orebody. Similarly, a north-striking fracture zone formed a conduit along the thrust contact below the impermeable Grass Valley Shale, to form the North Pit orebody.

Comment (Identification): This deposit encompasses the area covered by MRDS records #M060330 and M060383 which describe the previously existing historic gold mine. This record supersedes the earlier records and all material in the earlier records has been incorporated into this new record.

Comment (Commodity): Ore Materials: Gold

Comment (Commodity): Gangue Materials: Fe oxides, barite

Comment (Deposit): The Standard Mine project is a series of discrete shallow oxide deposits (Cordex, South Pit, North Pit, Star, and Buffalo Canyon). The stratigraphy of the Standard Mine project area is similar to that of Florida Canyon. The deposits consist of structurally controlled gold mineralization primarily along a karst horizon at the contact of the Natchez Pass Limestone and overlying Grass Valley argillites and phyllites. The horizon is characterized by strong silicification and jasperoid breccia. Mineralization locally extends upward into the Grass Valley formation and also occurs within fault structures and shear zones. The deposits tend to be thin (20 -100 feet thick) relative to their large areal extent. The first-discovered mineralized zone could be traced on the surface for 950 feet and was 50-250 ft wide. Gold and silver occur in a series of brecciated limestone and shale beds.

Comment (Location): The Standard Mine Project lies approximately four to five miles south of the Florida Canyon Mine. The project is a series of discrete shallow oxide deposits (Cordex, South Pit, North Pit, Star, and Buffalo Canyon) located on ridges of the foothills of the Humboldt Range.

Comment (Workings): Initially, the deposit was opened by three tunnels, several shafts, crosscuts and drifts. The mine was later developed by two pits about 650 m apart, with additional pits and heap leach facility planned for 2004.

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References

Reference (Deposit): Apollo Gold Corporation , press releases, 2002-2004, company website; http://www.sedar.com
URL: http://www.sedar.com

Reference (Deposit): Long, K.R., DeYoung, J.H., Jr., and Ludington, S.D., 1998, Database of significant deposits of gold, silver, copper, lead, and zinc in the United States; Part A, Database description and analysis; part B, Digital database: U.S. Geological Survey Open-File Report 98-206, 33 p., one 3.5 inch diskette.

Reference (Deposit): Johnson, M. G., 1977, NBMG Bull 89.

Reference (Deposit): Bonham, H. F., Jr., 1984, NBMG Field Examination of the Rye Patch District.

Reference (Deposit): NBMG Staff, 1985, NBMG OFR 85-3.

Reference (Deposit): Vanderburg, 1936, Reconnaissance of Mining Districts in Pershing Co., Nevada: USBM IC 6902

Reference (Deposit): Cuffney, R., Atkinson, R., and Buffa, R., 1991, Roadside Geology and Precious-Metal Mineralization, I-80 Corridor, Reno to Elko, Nevada, in Buffa, R. and Coyner, A., Eds., Geology and Ore Deposits of The Great Basin, Field Trip Guidebook Compendium, the Geological Society of Nevada, Reno, P. 1095.

Reference (Deposit): NBMG, 1988, The Nevada Mineral Industry 1987, NBMG Special Publication MI-1987.

Reference (Deposit): Ronkos, C. J., 1986, Geology and Interpretation Of Geochemistry Of The Standard Mine, Humboldt County, Nevada, Journal of Geochemical Exploration, vol. 25, p. 129-137.

Reference (Deposit): Silberling, N. J. and Wallace R. E., 1967, Geologic Map of the Imlay Quadrangle, Pershing County, Nevada, USGS Map GQ-666.

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Nevada Gold

Nevada has a total of 368 distinct gold districts. Of the of those, just 36 are major producers with production and/or reserves of over 1,000,000 ounces, 49 have production and/or reserves of over 100,000 ounces, with the rest having less than 100,000 ounces. Read more: Gold Districts of Nevada.