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Cobb Creek Prospect

Occurrence in Elko county in Nevada, United States with commodities Gold, Silver, Arsenic
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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. Economic information about the deposit and operations
  14. Mining district
  15. Land status
  16. Ownership information
  17. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10310533
MRDS ID MP90052
Record type Site
Current site name Cobb Creek Prospect
Alternate or previous names Orvana project, McCall zone

Comments on the site identification

  • This record replaces MRDS record No. MP90052 which is an incomplete entry for the same deposit.

Geographic coordinates

Geographic coordinates: -116.02593, 41.7749 (WGS84)
Relative position The prospect is located 5-6 miles southwest of Mountain City.

Site location context

Political divisions (FIPS codes)

Elko(county)

Nevada(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Ungina Wongo(quadrangle 1:24,000 scale)

Bull Run Mountains(quadrangle 1:100,000 scale)

McDermitt(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Owyhee(hydrologic unit)

Middle Snake-Boise(hydrologic accounting unit)

Middle Snake(hydrologic subregion)

Pacific Northwest(hydrologic region)

Federal lands

Humboldt-Toiyabe National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States Nevada Elko

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 045N 053E 29 Nevada

Comments on the location information

  • The prospect is located about 8 miles north of Maggie Summit

Commodities

Commodity Importance
Gold Primary
Silver Primary
Arsenic Critical Tertiary

Comments on the commodity information

  • Ore Materials: gold

Materials information

Materials Type of material
Gold Ore

Alteration

  • (Local) The Valmy Formation greenstone host rock has been argillized, potassium metasomatized, and weakly silicified.

Mineral occurrence model information

Model code 173
USGS model code 26a.1
Deposit model name Sediment-hosted Au
Mark3 model number 17

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metavolcanic Rock > Mafic Metamorphic Rock > Greenstone
    Rock unit name Valmy Formation
    Stratigraphic age (youngest) Ordovician

Nearby scientific data

(1) -116.02593, 41.7749
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Roberts Mountains Thrust

Economic information about the deposit and operations

Operation type Surface
Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant Yes
Discovery year 1983

Mining district

District name Mountain City District

Land status

Ownership category National Forest
Area name Humboldt National Forest

Ownership information

  • Type Owner
    Owner PanOrvana Resources
    Year 1988

Comments on the workings information

  • The prospect has been developed by drill roads and prospect pits

Comments on other economic factors

  • In their 1988 Annual Report, PanOrvana Resources reported a geologic resource for the deposit of 3.2 million short tons of material grading 0.045 opt gold (2900 kilotonnes of ore containing about 5 tonnes of gold). The
    McCall zone within this property has an estimated resource of over 173,000 ounces of gold.

Comments on development

  • The first reported prospecting was done by Pemberton Explorationsin 1983, who drilled at least six holes to test several gold-arsenic soil geochemical anomalies found on the property the prospect was explored and drilled by several companies in the 1980s.
    In 2004, Staccato Gold Resources Ltd. acquired the Cobb Creek gold property in the Independence Mountains district on a 50/50 basis with Bell Coast Capital Corp. The Cobb Creek property, which now comprises an area of 1,500 acres, has seen
    exploration by BHP, Newmont, Geomaque, and Orvana since the discovery of the mineralized zone in 1983. The
    McCall zone within this property has an estimated resources of over 173,000 oz Au.

Reference information

Bibliographic references

  • Deposit

    Pan Orvana Resources Inc., 1988 Annual Report

  • Deposit

    La Pointe and others, 1991, NBMG Bull. 106

  • Deposit

    Schmauch and others, 1992, Mineral resources of the Independence Range Special Study Area, Elko County, Nevada: U.S. Bureau of Mines Mineral Land Assessment Report MLA 17-92, 141 p.

  • Deposit

    NBMG MI-96; MI-97

  • Deposit

    Northern Miner, 1988

  • Deposit

    Spokane Spokesman Review, 1983

  • Deposit

    Long, K.R., DeYoung, J.H., Jr., and Ludington, S.D., 1998, Significant deposits of gold, silver, copper, lead, and zinc in the United States: U.S. Geological Survey Open-File Report 90-206A, 33 p.; 98-206B. one 3.5 inch diskette.

  • Deposit

    Staccato Gold

  • Deposit

    Resources Ltd. news release, 11/19/2004.

General comments

Subject category Comment text
Deposit The deposit consists of disseminated and stockwork gold-silver mineralization in argillized, potassium metasomatized, weakly silicified greenstone of the Valmy Formation.

Reporter information

Type Date Name Affiliation Comment
Reporter 18-AUG-1995 Sachiko Tanikawa U.S. Geological Survey
Reporter 01-JUN-2003 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.