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Tuscarora Deposit

Past Producer in Elko county in Nevada, United States with commodities Gold, Silver, Titanium
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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. Reserves and resources
  20. Links to other databases
  21. Bibliographic references
  22. General comments
  23. Reporter information

Geologic information

Identification information

Deposit ID 10310536
MRDS ID W700395
Record type Site
Current site name Tuscarora Deposit
Alternate or previous names Dexter Mine

Comments on the site identification

  • This record incorporates all material from record No. W700395 which is a very incomplete record and should be deleted from the database.

Geographic coordinates

Point of reference Pit
Geographic coordinates: -116.223, 41.3116 (WGS84)
Location accuracy 100(meters)
Relative position Center of Dexter pit.

Site location context

Political divisions (FIPS codes)

Elko(county)

Nevada(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Tuscarora(quadrangle 1:24,000 scale)

Tuscarora(quadrangle 1:100,000 scale)

McDermitt(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

South Fork Owyhee(hydrologic unit)

Middle Snake-Boise(hydrologic accounting unit)

Middle Snake(hydrologic subregion)

Pacific Northwest(hydrologic region)

Geographic areas

Country State County
United States Nevada Elko

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 039N 051E 03 Nevada

Commodities

Commodity Importance
Gold Primary
Silver Secondary
Titanium Critical Tertiary

Comments on the commodity information

  • Ore Materials: NATIVE GOLD
  • Gangue Materials: GANGUE: QUARTZ, ADULARIA, DICKITE, CHLORITE, TITANIUM MINERALS

Materials information

Materials Type of material
Gold Ore
Adularia Ore
Dickite Ore
Chlorite Ore
Quartz Gangue

Alteration

  • (Local) POTASSIC ALTERATION OF BEDDED ANDESITE

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
    Rock type qualifier adularized
    Stratigraphic age (youngest) Tertiary

Nearby scientific data

Pit (1) -116.223, 41.3116
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description N.E. STRIKING NORMAL FAULTS, DIPPING NW

Ore body information

  • General form STOCKWORK

Controls for ore emplacement

  • FRACTURES THAT TREND EASTWARD AND DIP NORTHWARD IN ADULARIZED BEADED ANDESITE. SHATTERED ZONES ALONG CONTACTS.

Comments on the geologic information

  • GEOL.COM: THE DEPOSITS ARE STOCKWORKS ALONG FRACTURES THAT TREND EASTWARD AND DIP NORTHWARD IN ADULARIZED BEADED ANDESITE. THE FRACTURE ZONE IS 1,400 FT LONG, 200 FT. WIDE AND WAS MINED TO A 300' DEPTH. ZONE CONTAINS MANY CLOSELY SPACED VEINLETS OF QUARTZ AND ADULARIA. FREE GOLD IS DEPOSITED IN DRUSY CAVITIES IN THE VEINLETS AND ALSO REPLACING BEDDED ANDESITE. SILVER CONTENT SO DISPERSED THAT VERY LITTLE SECONDARY ENRICHMENT OCCURRED

Economic information about the deposit and operations

Operation type Surface
Development status Past Producer
Commodity type Metallic
Deposit size Large
Significant Yes
Discovery year 1875
Mining method Open Pit
Year of first production 1875
Plant type Leach
Plant subcategory Precipitation
Milling method Leach-Precipitation

Mining district

District name Tuscarora

Land status

Ownership category BLM Administrative Area
Area name Elko BLM Administrative District

Ownership information

  • Type Operator
    Owner Tuscarora Gold Mines, Inc.
  • Type Owner
    Owner Carlin Resources Corp.
    Interest 40
    Home office Canada
    Year 1996
  • Type Owner
    Owner Homestake Canada Ltd
    Home office Canada
    Year 1996
    First year 1991
  • Type Unknown
    Owner Silver Standard Resources Inc. (3%Nsr)
    Home office Canada
    Year 1996
  • Type Owner
    Owner Fischer-Watt Gold Co., Inc.
    Interest 15
    Home office Idaho
    Year 1996
  • Type Owner
    Owner Horizon Gold Shares, Inc.
    Home office Colorado
    Year 1988
    Last year 1991
  • Type Owner
    Owner Granges Exploration Ltd.
    Home office Canada
    Year 1988

Comments on the production information

  • http://www.terracogold.com/files/Tuscarora_43-101_FinalV2_screen.pdf
    Total production in the district was seven million ounces of silver and 500,000 ounces of gold up to 1995, according to the report by Cruson (1995). Of the reported production, 25,000 ounces of the gold and 200,000 ounces of silver were mined from the Dexter Mine between 1989 and 1990. Placer deposits are reported to have contributed 300,000 ounces of the total gold, but the number ?is not well documented.?

Reserves and resources

  • Type In-situ
    Estimate year 1996
    Demonstrated 725748mt ore
    Total resources 725748mt ore

Comments on development

  • LARGE, LOW-GRADE GOLD DEPOSIT, DISCOVERED AFTER THE SILVER MINES HAD BEEN DEVELOPED. IT WAS WORKED UNTIL 1898, WHEN THE INFLUX OF WATER BECAME TOO GREAT

Reference information

Bibliographic references

  • Deposit

    SMITH R. M. (1976-56) MINERAL RES. OF ELKO CO. NEV., USGS OPEN-FILE REPORT

  • Deposit

    NOLAN, T. B. (1936) TUSCARORA MINING DISTRICT, ELKO CO. NEV., NEV. BUR. OF MINES BULL 25

  • Ownership

    RANDOL MINING DIRECTORY, 1994/95, U.S. MINES AND MINING COMPANIES, P357.

  • Deposit

    EMMONS W. H. (1910) RECONNAISSANCE OF ELKO LANDER AND EUREKA CO'S NEV., USGS BULL 408

  • Deposit

    NBMG, 1994, MI-1993

  • Ownership

    RANDOL MINING DIRECTORY, 1996/97, U.S. MINES AND MINING COMPANIES, P277.

  • 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.

  • Ownership

    AMERICAN MINES HANDBOOKS, 1987-1996.

  • Deposit

    NEV. DIV. MINE INSPECTION, 1983, DIRECTORY OF NEVADA MINE OPERATIONS ACTIVE DURING CALENDAR YEAR 1982.

  • Deposit

    NEV. DIV. MINE INSPECTION, 1991, DIRECTORY OF NEVADA MINE OPERATIONS ACTIVE DURING CALENDAR YEAR 1990, P. 23.

  • Deposit

    Cruson, Michael G., (1995), Progress Report on the Tuscarora District Elko County, Nevada; Cruson & Pansze, Geologists.

General comments

Subject category Comment text
Deposit DEPOSITS ARE STOCKWORKS ALONG FRACTURES THAT TREND EASTWARD AND DIP NORTH IN ADULARIZED ANDESITE. ZONE CONTAINS MANY CLOSELY-SPACED VEINLETS OF QUARTZ AND ADULARIA. FREE GOLD IS DEPOSITED IN DRUSY CAVITIES IN THE VEINLETS.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-AUG-88 Paidakovich, Matthew E. U.S. Geological Survey
Reporter 30-SEP-96 Buckingham, David A. U.S. Bureau of Mines
Reporter 01-APR-99 LaPointe, D.D. Nevada Bureau of Mines and Geology
Editor 01-SEP-07 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.