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Como Gold-Silver Property

Past Producer in Lyon county in Nevada, United States with commodities Gold, Silver, Copper, Lead, Zinc
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Alteration
  9. Mineral occurrence model information
  10. Host and associated rocks
  11. Nearby scientific data
  12. Geologic structures
  13. Ore body information
  14. Controls for ore emplacement
  15. Economic information about the deposit and operations
  16. Mining district
  17. Land status
  18. Ownership information
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10310425
Record type Site
Current site name Como Gold-Silver Property
Alternate or previous names Boyle, Pony Meadows, Hulley-Logan Mine Areas
Related records 10043884

Comments on the site 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.

Geographic coordinates

Geographic coordinates: -119.47932, 39.15268 (WGS84)
Relative position The Como gold-silver property is located about 30 miles southeast of Reno and 15 miles east of Carson City.

Site location context

Political divisions (FIPS codes)

Lyon(county)

Nevada(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Como(quadrangle 1:24,000 scale)

Carson City(quadrangle 1:100,000 scale)

Reno(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Middle Carson(hydrologic unit)

Carson(hydrologic accounting unit)

Central Lahontan(hydrologic subregion)

Great Basin(hydrologic region)

Federal lands

Bureau of Land Management(Bureau of Land Management NV)

Bureau of Land Management NV BLM(Type of land area)

BLM(Federal land areas administered by BLM)

Geographic areas

Country State County
United States Nevada Lyon

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 015N 022E 01 02 11 12 13 14 15 Nevada
Mount Diablo 015N 023E 06 07 18 Nevada

Comments on the location information

  • 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.

Commodities

Commodity Importance
Gold Primary
Silver Primary
Copper Tertiary
Lead Tertiary
Zinc Critical Tertiary

Comments on the commodity information

  • Commodity Info: silver/gold ratio of 25/1
  • Ore Materials: free gold, pyrite, silver chloride,tetrahedrite, copper-lead-zinc minerals
  • Gangue Materials: quartz, pyrite, sericite, clay minerals, alunite

Materials information

Materials Type of material
Gold Ore
Pyrite Ore
Chlorargyrite Ore
Tetrahedrite Ore
Quartz Gangue
Pyrite Gangue
Sericite Gangue
Clay Gangue
Alunite Gangue

Alteration

  • (Local) 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.

Mineral occurrence model information

Model code 150
USGS model code 25c
Deposit model name Epithermal vein, Comstock
Mark3 model number 16

Host and associated rocks

  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Stratigraphic age (youngest) Late Miocene
    Chronological age 7.5
    Dating method K-Ar
    Stratigraphic age (youngest) Late Miocene
    Chronological age 6
    Dating method K-Ar

Nearby scientific data

(1) -119.47932, 39.15268
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Walker Lane structural zone

Ore body information

  • General form tabular

Controls for ore emplacement

  • Shear zones

Comments on the geologic information

  • Quartz vein textures and inclusions indicate a gold-depositing boiling environment.

Economic information about the deposit and operations

Operation type Surface-Underground
Development status Past Producer
Commodity type Metallic
Deposit size Medium
Significant Yes
Year of first production 1860
Year of last production 1930

Mining district

District name Como District

Land status

Ownership category BLM Administrative Area
Area name Carson City BLM District
Ownership category Private

Ownership information

  • Type Owner-Operator
    Owner Royal Standard Minerals
    Year 2006

Comments on the workings information

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

Comments on other 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.

Comments on 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.

Reference information

Bibliographic references

General comments

Subject category Comment text
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.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-2004 LaPointe, D.D. Nevada Bureau of Mines and Geology
Editor 01-SEP-2007 Schruben, Paul G. U.S. Geological Survey Converted from S&A FileMaker format to Oracle. Edit checks on rocks, units, and ages with Geolex search, and other fields.

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Nevada resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.