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Moly-Tonopah Mine

Past Producer in Humboldt county in Nevada, United States with commodities Tungsten, Molybdenum, Copper, Iron
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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. Ownership information
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10104129
MRDS ID M242706
Record type Site
Current site name Moly-Tonopah Mine
Alternate or previous names Tonopah Tunnel, Jacks, NBMG Sample Site 2612, Moly Mine

Geographic coordinates

Geographic coordinates: -117.2579, 41.21128 (WGS84)
Elevation 1747

Site location context

Political divisions (FIPS codes)

Humboldt(county)

Nevada(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Adam Peak(quadrangle 1:24,000 scale)

Osgood Mountains(quadrangle 1:100,000 scale)

McDermitt(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Middle Humboldt(hydrologic unit)

Humboldt(hydrologic accounting unit)

Black Rock Desert-Humboldt(hydrologic subregion)

Great Basin(hydrologic region)

Geographic areas

Country State County
United States Nevada Humboldt

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 039N 042E 33 SW Nevada

Comments on the location information

  • ON EAST SIDE OF OSGOOD RANGE ABOUT 0.5 MILE SW OF GETCHELL MILL, INFOOTWALL OF GETCHELL SOUTH PIT GOLD MINE

Commodities

Commodity Importance
Tungsten Critical Primary
Molybdenum Secondary
Copper Tertiary
Iron Tertiary

Materials information

Materials Type of material
Chalcopyrite Ore
Chrysocolla Ore
Molybdenite Ore
Pyrite Ore
Pyrrhotite Ore
Scheelite Ore
Epidote Gangue
Garnet Gangue
Pyroxene Gangue
Quartz Gangue

Alteration

  • (Local) Silication; Silicification; Bleaching And Marbleization

Analytical data

Result SAMPLE 2612 OF GARNET SKARN WITH SCHEELITE AND MOLYBDENITE, CONTAINS 20% FE, 1.5% MG, 15% CA, 0.07% TI, 50 PPM B, 1.5 PPM BE, 20 PPM BI, 30 PPM CO, 100 PPM CU, 1000 PPM MO, 70 PPM NI, 50 PPM PB, 15 PPM SN, 300 PPM V, 500 PPM W, 15 PPM Y, 300 PPM ZN.

Mineral occurrence model information

Model code 42
USGS model code 14a
Deposit model name W skarn

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Rock unit name Osgood Mountains Stock
    Rock description Osgood Mountains Stock
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Cambrian
    Stratigraphic age (youngest) Late Cambrian
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone
    Rock unit name Preble
    Rock description Preble

Nearby scientific data

(1) -117.2579, 41.21128
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Reg.Struct: Getchell Fault
Type of structure Local
Structure description Folds, N-Trending Faults

Ore body information

  • General form TABULAR
    Strike NW
    Dip 30-45 NE
    Thickness 4.57M
    Length 304.8M
    Width 152.4M

Controls for ore emplacement

  • Contact Of Granodiorite With Calcareous Sediments

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Potosi District; Getchell District

Ownership information

  • Type Owner
    Owner Getchell Mine Inc. (Goldfield Corp.) (1940'S); Frm Co.
    First year 1984

Comments on the reserve resource information

  • DELINEATED BY GEOLOGIC MAPPING AND DRILLING.

Comments on the workings information

  • ADIT TO UNDERGROUND LEVELS (2), INTERNAL SHAFT, OPEN PIT, STOPES

Comments on development

  • THIS IS PROBABLY THE JACK MINE MENTIONED BY HESS AND LARSON IN 1921 AS BEING PROSPECTED FOR CU AND MO. THE MOLY-TONOPAH NAME WAS DERIVED FROM 2 NAMES APPLIED TO SEPARATE AREAS OF THE DEPOSIT; THE MOLY WORKINGS ARE ON THE SE SIDE OF THE DEPOSIT, IN THE FOOTWALL OF THE GETCHELL SOUTH PIT GOLD MINE, AND ARE AMONG THE OLDEST IN THE DISTRICT, DATING BACK TO ABOUT 1915, WHEN IT WAS KNOWN AS THE JACKS MINE. THE TONOPAH NAME WAS APPLIED TO THE NORTH END OF THE DEPOSIT WHERE A SMALL OPEN PIT WAS STARTED ABOUT 1943. BECAUSE OF LOW-GRADE AND PRESENCE OF MOLYBDENUM, TUNGSTEN PRODUCTION FROM THE DEPOSIT WAS LOW. IN 1950-51 AND AGAIN IN 1955-56, THE GETCHELL MINE INC. MINED ABOUT 43000 TONS OF ORE THAT AVERAGED ABOUT 0.29% WO3. MOST OF THIS ORE WAS MINED FROM THE OPEN PIT. PROPERTY WAS INACTIVE AT TIME OF EXAMINATION IN 1984, BUT HAD BEEN EXTENSIVELY DRILLED IN 1975-1976, AT WHICH TIME A POTENTIAL 1 TO 1.5 MILLION TONS OF 0.4% WO3 ORE WAS DETERMINED FOR THE MOLY-TONOPAH AREA.

Reference information

Bibliographic references

  • Deposit

    STAGER, H.K., IN PREPARATION, 1986, NBMG BULL ON TUNGS TEN DEPOSITS OF NEVADA.

  • Deposit

    TINGLEY, J.V., 5 SEP 84, NBMG FIELD EXAMINATION AND SAMPLE ANALYSIS.

  • Deposit

    TINGLEY, J.V., 1978, UNPUB. REPORT ON THE GETCHELL TUNGSTEN AREA, ON FILE AT NBMG.

  • Deposit

    SCHILLING, JOHN, 1979, NBMG OFR 79-3 ON MOLYBDENUM IN NEVADA.

  • Deposit

    WILLDEN, R., 1964, NBMG BULL 59.

  • Deposit

    HOTZ, P.E. AND WILLDEN, R., 1964, USGS P.P. 431.

  • Deposit

    HOBBS, S.W. AND CLABAUGH, S.E., 1946, NBMG BULL 44.

  • Deposit

    HESS, F.L. AND LARSEN, E.S., 1921, USGS BULL 725-D.

  • Deposit

    NBMG STAFF, 1985, NBMG OFR 85-3.

  • Production

    STAGER, H.K., (IN PREP. 1986); SCHILLING, 1979.

  • Reserve-Resource

    NBMG FILES

General comments

Subject category Comment text
Deposit SCHEELITE OCCURS IN ATACTITE ZONE ABOUT 1000 FT LONG ALONG E SIDE OF OSGOOD GRANODIORITE IGNEOUS CONTACT IS GENERALLY CONFORMABLE WITH SEDIMENTARY BEDS, AND BOTH STRIKE NW, DIP 30-45 NE. TACTITE EXTENDS DOWN-DIP IN TABULAR BODIES CONTINUOUS TO THE 650 LEVEL THAT IS 300 FT BELOW SURFACE. ORE SHOOTS AND THICKER TACTITE APPEAR TO HAVE FORMED AT ROLLS AND INDENTATIONS IN THE CONTACT. AT DEPTH, BENEATH THE OUTCROP, THE CONTACT DIPS EAST AND THEN REVERSES TO A WEST DIP, THEN AGAIN REVERSES TO DIP EAST. WHERE THE WESTERN DIP CROSS CUTS THE LIMESTONE, THICK SECTIONS OF TACTITE OCCUR. TACTITE AT THIS MINE IS BANDED, FINE-GRAINED, AND CONTAINS MORE SULFIDE THAN MOST OTHER DEPOSITS IN THE DISTRICT. BEST ORE IS COMPOSED MAINLY OF FINE-GRAINED GARNET, EPIDOTE AND QUARTZ, WITH LARGE CLOTS OF PYRITE, PYRRHOTITE AND MOLYBDENITE, AND SCHEELITE. AWAY FROM THE CONTACT ZONE, UP SECTION TO THE EAST, TACTITE GIVES WAY TO SILICATED LIMESTONE INTERBEDDED WITH CALC-SILICATE HORNFELS, THEN TO BLEACHED AND
Deposit MARBLEIZED LIMESTONE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-1986 La Pointe, D.D. (Tingley, J.V.) Nevada Bureau of Mines and Geology
Updater 01-SEP-1994 Li, Zhiping (Peters, S.) U.S. Geological Survey

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.