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Buckhorn

Producer in Eureka county in Nevada, United States with commodities Gold, Silver, Arsenic, Mercury, Tungsten, Thallium, Antimony, Copper, 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. Production statistics
  20. Reserves and resources
  21. Workings at the site
  22. Links to other databases
  23. Bibliographic references
  24. General comments
  25. Reporter information

Geologic information

Identification information

Deposit ID 10107309
MRDS ID W016362
Record type Site
Current site name Buckhorn
Alternate or previous names NBMG Sample Locations 1512 Aandb, 1513, 514, 1515, 1516, 1551, 1552, 1553, 1554 Aandb, 1557, 1558, North Buckhorn, Junard, Glory Hole
Related records 10271092, 10310544

Geographic coordinates

Geographic coordinates: -116.48981, 40.18852 (WGS84)
Elevation 2048
Relative position APPROXIMATELY 6 MILES NORTHEAST OF CORTEZ. 110 KM SOUTH OF CARLIN, 95 KM NW OF EUREKA.

Site location context

Political divisions (FIPS codes)

Eureka(county)

Nevada(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Buckhorn Mine(quadrangle 1:24,000 scale)

Crescent Valley(quadrangle 1:100,000 scale)

Winnemucca(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Pine(hydrologic unit)

Humboldt(hydrologic accounting unit)

Black Rock Desert-Humboldt(hydrologic subregion)

Great Basin(hydrologic region)

Geographic areas

Country State County
United States Nevada Eureka

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 027N 049E 31 Nevada

Commodities

Commodity Importance
Gold Primary
Silver Primary
Arsenic Critical Tertiary
Mercury Tertiary
Tungsten Critical Tertiary
Thallium Tertiary
Antimony Critical Tertiary
Copper Tertiary
Zinc Critical Tertiary

Comments on the commodity information

  • AG:AU RATIO 15:1. GOLD RECOVERY IS 67%.

Materials information

Materials Type of material
Calcite Ore
Goethite Ore
Gypsum Ore
Jarosite Ore
Kaolinite Ore
Marcasite Ore
Montmorillonite Ore
Pyrite Ore
Quartz Ore
Sericite Ore

Alteration

  • (Local) See Comments

Analytical data

Result AS, HG, W, TL, SB ARE ENRICHED IN THE DEPOSIT. A SLIGHT ENRICHMENT OF CU AND ZN IN THE SULFIDE ZONE MAY INDICATE A DEPTH ZONATION.

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 Associated
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Stratigraphic age (youngest) Miocene
    Chronological age 16.3
    Stratigraphic age (youngest) Miocene
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Stratigraphic age (youngest) Miocene
    Chronological age 16.3

Nearby scientific data

(1) Andesite and basalt flows
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Roberts Mountains Thrust
Type of structure Local
Structure description A System Of Parallel Normal Faults Strikes N10w And Controls Mineralization. Displacements Are Less Than A Few Hundred Feet.

Ore body information

  • Strike N10W
    Dip 75W

Controls for ore emplacement

  • High Angle Normal Faults Acted As Conduits For Hypogene Hydrothermal Fluids While Subsidiary Fracture Systems Increased Permeability In The Basalts Allowing The Development Of Stockwork Mineralization. Overlying Graben Fill Sediments May Have Locally Acted As An Impermeable Caprock.

Comments on the geologic information

  • SEE WELLS AND ELLIOT (1969) USGS OPEN-FILE REPORT FOR GEOCHEMICAL AND GEOLOGIC MAPS OF THE MINE AREA. BASALTIC ANDESITE FLOWS ARE ABOUT 400 FT. THICK AS DETERMINED FROM RESISTIVITY MEASUREMENTS. BENEATH THE TERTIARY ROCKS ARE EITHER THE CHERTY FOURMILE CANYON FORMATION, OR CARBONATES OF THE LOWER PLATE ASSEMBLAGE. EXTENSIONS OF THE JURASSIC MILL CANYON STOCK MAY BE PRESENT AT DEPTH. RHYOLITE PLUGS AND FLOWS (15.3, 0.4 MA) EXPOSED FOUR MILES SOUTHWEST OF MINE MAY BE RELATED TO HYDROTHERMAL SYSTEM RESPONSIBLE FOR AU MINERALIZATION AT BUCKHORN.

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1908
Discoverer Joe Lynn, W. S. Mcrea, William Ebbert, John Swan
Year of first production 1910
Production years 1910; 1914-1916; 1931-1932; 1936; 1984-1991

Mining district

District name Buckhorn District

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner Cominco American, Inc.
  • Type Owner
    Owner Cominco American, Inc./Equinox Resources Ltd. Joint Venture

Production statistics

  • Year 1910
    Material ORE-AU, AG
    Accuracy Estimate
    Description Ap_Grade: ^5.23 Opt Au, 49.3 Opt Ag
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Silver Silver 1559g/mt
    Major Ore Gold Gold 165g/mt
  • Year 1914
    Material ORE-AU, AG
    Accuracy Estimate
    Description Ap_Grade: ^0.18 Opt Au, 1.47 Opt Ag
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Silver Silver 46g/mt
    Major Ore Gold Gold 6g/mt
  • Year 1915
    Material ORE-AU, AG
    Accuracy Estimate
    Description Ap_Grade: ^0.14 Opt Au, 1.02 Opt Ag
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Silver Silver 32g/mt
    Major Ore Gold Gold 4g/mt
  • Year 1916
    Period 1910-1916
    Material ORE-AU, AG
    Accuracy Estimate
    Description Cp_Grade: ^0.15 Opt Au, 1.25 Opt Ag
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Silver Silver 40g/mt
    Major Ore Gold Gold 5g/mt
  • Year 1916
    Material ORE-AU, AG
    Accuracy Estimate
    Description Ap_Grade: ^0.18 Opt Au, 1.62 Opt Ag
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Silver Silver 51g/mt
    Major Ore Gold Gold 6g/mt
  • Year 1931
    Material ORE-AU, AG
    Accuracy Estimate
    Description Ap_Grade: ^0.81 Opt Au, 5.96 Opt Ag
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Silver Silver 189g/mt
    Major Ore Gold Gold 26g/mt
  • Year 1932
    Period 1931-32
    Material ORE-AU, AG
    Accuracy Estimate
    Description Cp_Grade: ^0.23 Opt Au, 1.85 Opt Ag
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Silver Silver 59g/mt
    Major Ore Gold Gold 7g/mt

Comments on the production information

  • ONLY CUMULATIVE PRODUCTION FIGURES AVAILABLE FOR 1932 AND 1936 PRODUCTION.

Reserves and resources

  • Type In-situ
    Estimate year 1984
    Total resources 1405000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 1.129 g/mt Gold Major 1984
    Silver Ag 17.506 g/mt Silver Major 1984

Comments on the reserve resource information

  • 1984 RESERVES CALCULATED USING CUTOFF OF 0.02 OPT AU.

Workings at the site

  • Type of workings Surface
    Overall depth 60.96M

Comments on the workings information

  • PRIOR TO 1985, MINE WORKINGS CONSISTED OF TWO GLORY HOLES AND A 1,750 FT. HAULAGE ROAD, ALONG WITH EXTENSIVE SUBSIDIARY WORKINGS. IN 1985, ORE WAS BEING MINED BY OPEN PIT AT A RATE OF 750,000 TONS PER YEAR WITH AN AVERAGE STRIPPING RATIO OF 1.38:1.

Comments on development

  • THE FIRST CLAIMS WERE STAKED IN 1908. IN 1910, BUCKHORN MINES CO. WAS ORGANIZED AND A MILL WAS CONSTRUCTED IN 1913. THIS CYANIDE PLANT OPERATED 1914-1916, PROCESSING OXIDIZED ORE MINED BY GLORY HOLE METHOD. PARDNERS MINES CORP. REOPENED THE MINE AND OPERATED A FLOTATION MILL 1935-1937 TO TREAT SULFIDE ORE. FROM 1938 TO 1978 PRODUCTION WAS LIMITED TO WORKING OF THE DUMPS. IN 1978, BAR RESOURCES LTD. ATTEMPTED TO PROCESS OXIDE ORE FROM AN OPEN PIT, BUT FAILED DUE TO MINING AND TREATMENT PROBLEMS CAUSED BY HIGH CLAY CONTENT OF THE ORE. BETHLEHEM COPPER CORP. ACQUIRED AN INTEREST IN THE PROPERTY IN 1979. COMINCO AMERICAN'S INVOLVEMENT BEGAN IN 1980 WITH THE PURCHASE OF BETHLEHEM COPPER. DURING 1980, BETHLEHEM BLOCKED OUT A POTENTIALLY BULK-MINEABLE OREBODY IN THE AREA OF THE 1978 BAR RESOURCES PIT. A FEASIBILITY STUDY WAS INITIATED IN MARCH 1983. CONSTRUCTION BEGAN IN SEPTEMBER AND GOLD WAS POURED IN JUNE 1984. ; ECON.COM: TOTAL CAPITAL COSTS FOR COMINCO AMERICAN MINE
  • DEVELOPMENT ARE $12 MILLION. PRODUCTION COSTS ARE $200/OZ GOLD.

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit Discovery Year: 1908-1909
Deposit ORE OCCURS AS THREE LENSES (NORTH BUCKHORN, JUNKYARD, GLORY HOLE) ALONG A ZONE 3000 FT. LONG AND 100-1000 FT. WIDE. BARREN AREAS BETWEEN ORE LENSES TYPICALLY CONTAIN LESS THAN 50 PPB GOLD.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JAN-1976 Weeks, Robert U.S. Geological Survey
Updater 01-OCT-1980 Kirkham, Richard A. Nevada Bureau of Mines and Geology
Updater 01-JUL-1981 Zigler, Jan L. U.S. Geological Survey
Updater 01-OCT-1984 La Pointe, D.D. (Tingley, J.V.) Nevada Bureau of Mines and Geology
Updater 01-NOV-1991 Phinisey, J. D. (Marcus, S.) U.S. Geological Survey
Updater 01-SEP-1994 Li, Zhiping (Moyer, Lorre A.) U.S. Geological Survey

Beyond USGS

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

External references

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.