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Winrock Mine

Producer in White Pine county in Nevada, United States with commodity Gold
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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. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Mining district
  15. Land status
  16. Ownership information
  17. Production statistics
  18. Reserves and resources
  19. Links to other databases
  20. Bibliographic references
  21. General comments
  22. Reporter information

Geologic information

Identification information

Deposit ID 10310389
MRDS ID RE00278
Record type Site
Current site name Winrock Mine
Alternate or previous names Blowout Pit, Deer Camp pit
Related records 10310453

Comments on the site identification

  • This record includes all material from earlier record #RE00278 which should be deleted from the database.
    The deposit is often combined with the Casino deposit in the literature. The Hilltop pit is sometimes included with the Winrock Mine but here is included with the Yankee Mine.
    The Winrock Mine is part of Placer Dome?s Bald Mountain Mine project.

Geographic coordinates

Geographic coordinates: -115.4493, 39.9458 (WGS84)
Elevation 2125
Relative position The Winrock mine is located on the west flank of the Maverick Springs Range about 65 miles south-southeast of Elko.

Site location context

Political divisions (FIPS codes)

White Pine(county)

Nevada(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Tognini Spring(quadrangle 1:24,000 scale)

Newark Lake(quadrangle 1:100,000 scale)

Ely(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Long-Ruby Valleys(hydrologic unit)

Central Nevada Desert Basins(hydrologic accounting unit)

Central Nevada Desert Basins(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 White Pine

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 024N 058E 16, 21 Nevada

Comments on the location information

  • The mine is located about 1500 meters east-southeast of Julian Well.UTM is for the Blowout pit; Deer Camp pit is about 250 meters away.

Commodities

Commodity Importance
Gold Primary

Comments on the commodity information

  • Ore Materials: gold
  • Gangue Materials: iron oxides, quartz

Materials information

Materials Type of material
Gold Ore
Quartz Gangue

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 Sedimentary Rock
    Rock unit name Pilot Shale
    Stratigraphic age (youngest) Late Devonian
    Stratigraphic age (oldest) Early Mississippian
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone
    Rock unit name Joana Limestone
    Stratigraphic age (youngest) Early Mississippian
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Shale
    Rock unit name Chainman Shale
    Stratigraphic age (youngest) Late Mississippian
    Stratigraphic age (oldest) Early Mississippian

Nearby scientific data

(1) -115.4493, 39.9458
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description The Maverick Springs Range is an east-tilted fault block
Type of structure Local
Structure description At Winrock, the dominant structure controls are N25W and N20- 40E.

Controls for ore emplacement

  • At Winrock, the dominant structure controls are N25W and N2040E

Economic information about the deposit and operations

Operation type Surface
Development status Producer
Commodity type Metallic
Deposit size Small
Significant Yes
Discoverer Lyle Campbell
Year of first production 1991
Year of last production 1992
Production years 1991-1992

Mining district

District name Bald Mountain District

Land status

Ownership category BLM Administrative Area
Area name Ely BLM district

Ownership information

  • Type Owner-Operator
    Owner Placer Dome U. S., Inc.
    Year 2004
  • Type Operator
    Owner USMX, Inc.
  • Type Joint Venture Owner
    Owner USMX, Inc. (51%)/Pegasus Gold Inc. (49%)

Production statistics

  • Year 1991
    Material ore
    Ore mined 399000mt
    Accuracy Accurate
    Description Ap_Grade: ^0.037 Opt Au
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Primary Ore Gold Gold 1g/mt

Reserves and resources

  • Type In-situ
    Estimate year 1989
    Total resources 830600mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 1.47 g/mt Gold Major 1989
  • Type In-situ
    Estimate year 1991
    Total resources 503000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 1.61 g/mt Gold Major 1991

Comments on the workings information

  • A single heap leach pad was developed to treat ore from both the Casino and Winrock deposits and production is lumped together for the two open-pit mines.

Comments on other economic factors

  • In 1990, the Winrock deposit reserves were reported at 993 Kilotonnes of ore grading 0.037 opt gold.
    The Casino-Winrock mines produced an aggregate 20,000 ounces of gold in 1991 and produced an aggregate 19,800 ounces of gold in 1992, for a total production of 39800 ounces for the two deposits.
    The Casino-Winrock heap leach pad contained 1.43 million tons of ore. Rinsing of the heap leach began in 1994 and was essentially complete by 1997.

Comments on development

  • The original claims in the mine area were staked n 1978 by a grubstaked geologist working for Amselco Minerals. USMX INc. leased the property in 1987 and began a soil geochemical survey that delineated a gold anomaly that was drilled in late 1987. By 1989, USMX drilling had delineated a mineral resource of 2.9 million tons of oxide gold ore grading 0.038 ounces per ton. In 1991 the mine began operations under a 51/49 USMX-Pegasus Joint Venture. Mining commenced in July, 1991 and was completed in 1992. Haul distance was 1.3 miles and strip ratio was 0.93:1.

Reference information

Bibliographic references

  • Deposit

    Cox, John, and Lamborn, John, 1991, Geology and mineralization of the Winrock Project, White Pine County Nevada; in Geology and ore deposits of the Great Basin; field trip guidebook compendium, eds. Buffa, Ruth H; Coyner, Alan R.

  • Deposit

    USMX, 1990, Annual report for 1989.

  • Deposit

    USMX, 1992, Annual report for 1991

  • Deposit

    NBMG MI-88 through MI-02

  • Deposit

    NBMG Map 91, 2nd, 3rd

  • Deposit

    DEIS, 1995

  • Deposit

    FEIS, 1995

  • Deposit

    Amer. Mines (1991-92), 1991 thru Amer. Mines (2000), 2001

  • Deposit

    Nevada Land Status, 1990

  • 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.

  • Deposit

    Nutt, C.J., Hofstra, A.H., Hart, K.S., and Mortensen, J.K., 2000, Structural setting and genesis of gold deposits in the Bald Mountain-Alligator Ridge area, east-central Nevada, in Cluer, J.K., Price, J.G., Struhsacker, E.M., Hardyman, R.F., and Morris, C.L., eds., Geology and Ore Deposits 2000: The Great Basin and Beyond: Geological Society of Nevada Symposium Proceedings, May 15-18, 2000, p. 513-537.

  • Deposit

    Hitchborn and others, 1996, Geology and Gold Deposits of the Bald Mountain Mining District, White Pine County, Nevada, in Geology and Ore Deposits of the American Cordillera Symposium Proceedings, eds. A. Coyner and P. Fahey.

  • Deposit

    The Geological Society of Nevada 1996 Spring Field trip, Geology and Gold Deposits of Eastern Nevada, GSN Special Publication No. 23.

General comments

Subject category Comment text
Deposit The Winrock Gold deposits occur in a structurally complex zone between two major NW-trending fault zones that both have both dip-slip and left-lateral strike slip components. The intervening rocks have been uplifted, rotated and inensely fractured by faults trending NE and NW. The structures have created permeability in the rocks allowing migratoin of upward-moving hydrothermal fluids.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JAN-1993 Phinisey, J. D. (Marcus, S.) U.S. Geological Survey
Reporter 01-NOV-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.