Como Gold-Silver Property

Site Name

Primary: Como Gold-Silver Property
Secondary: Boyle
Secondary: Pony Meadows
Secondary: Hulley-Logan Mine Areas

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Commodity

Primary: Silver
Primary: Gold
Tertiary: Lead
Tertiary: Copper
Tertiary: Zinc

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Location

State: Nevada
County: Lyon
District: Como 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: Carson City BLM District

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Holdings

Not available

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Workings

Not available

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Ownership

Owner Name: Royal Standard Minerals
Info Year: 2006

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Production

Not available

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Deposit

Record Type: Site
Operation Category: Past Producer
Deposit Type: vein
Operation Type: Surface-Underground
Year First Production: 1860
Year Last Production: 1930
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: Epithermal vein, Comstock

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Orebody

Form: tabular

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Structure

Type: R
Description: Walker Lane structural zone

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Alterations

Alteration Type: L
Alteration Text: Vikre and McKee have identified five distinct hydrothermal mineral alteration assemblages affecting the host andesite in the Como District. Some of these are spatially restricted to vein selvages and others are more widespread. Mixed clay alteration assemblages indicate periodic changes from acid leaching to neutral conditions during gold-silver deposition. Alteration minerals proesent are: quartz, diaspore, sericite, kaolinite,dickite, halloysite, pyrophyllite, pyrite, montmorillonite, and alunite.

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Rocks

Name: Andesite
Role: Host
Age Type: Host Rock
Age in Years: 7.500000+-
Dating Method: K-Ar
Age Young: Late Miocene

Name: Andesite
Role: Host
Age Type: Host Rock
Age in Years: 6.000000+-
Dating Method: K-Ar
Age Young: Late Miocene

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Analytical Data

Not available

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Materials

Ore: Gold
Ore: Pyrite
Ore: Chlorargyrite
Ore: Tetrahedrite
Gangue: Quartz
Gangue: Pyrite
Gangue: Sericite
Gangue: Clay
Gangue: Alunite

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Comments

Comment (Workings): The district veins are developed by historic underground workings (shafts, adits, drifts) as well as by more recent drilling and surface exploration.

Comment (Geology): Quartz vein textures and inclusions indicate a gold-depositing boiling environment.

Comment (Development): In 2002, Royal Standard Minerals Inc. acquired the Como gold-silver property consisting of 47 (now 60) unpatented lode claims and five patented claims in the main historic Como District, which produced between the 1860s and 1930s. Since the 1960s several large companies, including St. Joe American, Amoco, Meridian Gold, Amax Gold Inc., and Anglo Gold Corp., have explored the property. Amax identified a low grade open pit resource, based on 46 holes. Anglo released the property in 2001 after drilling eight holes and completing considerable surface geologic mapping and geochemical sampling. Anglo's drilling program discovered a "new" high-grade vein system (0.45 opt over 10 feet within a mineralized zone that is 40 to 70 feet thick). Royal Standard began follow up work based upon the previous exploration results and in February 2004 announced the completion of the evaluation of its Como Gold-Silver Project. Past work has identified two bulk-mineable gold-silver targets requiring further work. Anglo Gold conducted perhaps the most intriguing work on the property in 2000, looking for a multi-million ounce deposit. Although they released the property in 2001, their drilling identified a high-grade vein system that with values of 0.45 opt over a 10-foot width with a thickness ranging from 40 to 70 feet. Surface rock chip samples on this vein have returned values up to 0.417 opt gold.

Comment (Economic Factors): The property has had historical underground production of about 20,000 ounces of gold and 500,000 ounces of silver. Royal Standard reports an open pit mineable resource of 40,000 ounces of gold in the central area of the property, No estimates of remaining reserves or resources are currently available.

Comment (Commodity): Ore Materials: free gold, pyrite, silver chloride,tetrahedrite, copper-lead-zinc minerals

Comment (Commodity): Gangue Materials: quartz, pyrite, sericite, clay minerals, alunite

Comment (Deposit): Historically, mineralization in the district is contained in quartz veins of the Buckeye-Como vein system. Underground mine records show that the Buckeye-Como vein was mined along a continuous zone 720 feet long. Veins were 10-50 feet wide with up to 4 feet of soft crumbly quartz on the hanging wall and were developed along strike for more than 1600 feet. Ore is oxidized down to 250 level, below which veins were barren. Quartz vein is made up of hard white or slightly bluish-tinged quartz, banded in some places, with later clear quartz crystals filling cavities. The Elgin vein parallels the Como vein about a1000 feet to the south. Although the Elgin Vein has had minor recorded production, assays along the surface of the veil and drilling encountered high-grade gold-silver mineralization along an untested strike length of 3,000 feet. Additionally, Anglo?s drilling discovered a "new" high grade (0.45 opt over 10' within a mineralized zone that is 40-70' in thickness) vein system. RSM plans to test the western extension of the Elgin vein where it plunges under valley cover. Similarly encouraging assay results were obtained for mineralization along the Como vein, Palmyra vein/stockwork, and the Hully-Logan vein areas which offer targets for gold-silver resources that have not been drill tested.

Comment (Identification): This record is for the currently explored Como gold-silver property which encompasses the main central area of the Como District which had historic production and whose mines are described by earlier individual MRDS records.

Comment (Location): The Como gold-silver property is located in the area of the main Como District mines on the north slope of the Pine Nut Mountains. It consists of 5 patented claims and 60 unpatented mining claims.

Comment (Commodity): Commodity Info: silver/gold ratio of 25/1

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References

Reference (Deposit): Royal Standard Minerals website 2006, http://www.royalstandardminerals.com
URL: http://www.royalstandardminerals.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): Sirdevan, W.H, Report On Nevada Deep Mines Co, Unpublished Report, Item 6, File 181, NBMG

Reference (Deposit): NBMG MI-2002.

Reference (Deposit): VIkre, Peter and McKee, Edwin, 1994, Geology, alteration, and geochronology of the Como District, Lyon County, Nevada; Bulletin of the Society of Economic Geologists, vol.89, no.3, pp.639-646.

Reference (Deposit): Royal Standard Minerals Inc., website and press releases, 4/3/02, 2/1004

Reference (Deposit): Jerry Baughman, oral communication, 1999

Reference (Deposit): NBMG Bull 75

Reference (Deposit): Carlisle, H.C., Report on Como Mines Co, Unpublished Report, Item 3 File 181, NBMG.

Reference (Deposit): Stoddard, C, Carpenter, J.A., Mineral Resources of Storey and Lyon Counties, Nev (1950) NBMG Bull 49.

Reference (Deposit): Cutler, H.C., "Como Nevada," Mining & Scientific Press, April 13, 1912, pp 539-540.

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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.