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Bobtail Mine

Past Producer in Gila county in Arizona, United States with commodities Gold, Silver, Copper, Tungsten, Lead, 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. Host and associated rocks
  9. Nearby scientific data
  10. Ore body information
  11. Economic information about the deposit and operations
  12. Mining district
  13. Land status
  14. Production statistics
  15. Workings at the site
  16. Links to other databases
  17. Bibliographic references
  18. Reporter information

Geologic information

Identification information

Deposit ID 10102398
MRDS ID M000370
Record type Site
Current site name Bobtail Mine
Alternate or previous names Mariana Missouri, Virginia
Related records 10258459

Geographic coordinates

Geographic coordinates: -110.86402, 33.27287 (WGS84)
Elevation 1524
Relative position 2 MILES WSW OF PINAL PEAK

Site location context

Political divisions (FIPS codes)

Gila(county)

Arizona(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Pinal Peak(quadrangle 1:24,000 scale)

Globe(quadrangle 1:100,000 scale)

Mesa(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Middle Gila(hydrologic unit)

Middle Gila(hydrologic accounting unit)

Middle Gila(hydrologic subregion)

Lower Colorado(hydrologic region)

Federal lands

Tonto 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 Arizona Gila

Public Land Survey System information

Meridian Township Range Section Fraction State
Gila and Salt River 002S 014E 12 Arizona

Commodities

Commodity Importance
Gold Primary
Silver Primary
Copper Primary
Tungsten Critical Secondary
Lead Tertiary
Zinc Critical Tertiary

Comments on the commodity information

  • THE BOBTAIL VEIN CARRIES LITTLE OR NO TUNGSTEN VALUE. THE TUNGSTEN VEIN CONTAINS SPARSE TUNGSTEN MINERALS

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Gold Ore
Huebnerite Ore
Pyrite Ore
Scheelite Ore
Silver Ore
Sphalerite Ore

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Stratigraphic age (youngest) Paleocene
    Stratigraphic age (youngest) Paleocene
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite > Diabase
  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
    Rock unit name Schultze Granite
    Rock description Schultze Granite
  • Host or associated Host
    Rock type Metamorphic Rock > Schist
    Rock unit name Pinal Schist
    Rock description Pinal Schist

Nearby scientific data

(1) -110.86402, 33.27287
ListMap

Economic information

Ore body information

  • General form PINCH AND SWELL
    Strike N30E TO N55E
    Dip N37W TO N62W
    Thickness 0.3M

Comments on the geologic information

  • NO DETAILED GEOLOGIC MAP OF AREA AVAILABLE. NE-TRENDING ETERT SCHULTZE GRANITE DIKES ARE COMMON THROUGHOUT DISTRICT, AS ARE OUTCROPS OF MADERA DIORITE(PREC). MINERALIZATION ASSOCIATED WITH ETERT SCHULTZE GRANITE INTRUSTION.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discoverer 1898
Year of last production 1950

Mining district

District name Pioneer District

Land status

Ownership category National Forest
Area name Tonto National Forest

Production statistics

  • Year 1945
    Period 1940 - 1945
    Material AG
    Accuracy Estimate
    Description Cp_Grade: ^12.06 Oz/Ton
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Silver Silver 341g/mt
  • Year 1945
    Period 1940 - 1945
    Material CU
    Accuracy Estimate
    Description Cp_Grade: ^2.8% Cu
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Copper Copper 3wt-pct
  • Year 1945
    Period 1940 - 1945
    Material AU
    Accuracy Estimate
    Description Cp_Grade: ^0.11 Oz/Ton
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 3g/mt

Comments on the production information

  • NO TUNGSTEN PRODUCTION IS KNOWN TO HAVE BEEN RECORDED.

Workings at the site

  • Type of workings Unknown
    Length 304.8M
    Overall depth 66.45M

Comments on the workings information

  • SEVERAL SHALLOW PITS AND OPEN CUTS, AND TWO SHORT ADITS ARE ALSO LOCATED ON THE PROPERTY, INCLUDES INCLINED SHAFT, 75 FT AND ADIT, 235 FT LONG.

Comments on development

  • OPERATORS INCLUDED PANDORA COPPER CO., 1915, BOBTAIL DEVELOPMENT CO., KILPATRICK BROTHERS, TULSA MINERALS CORP. 1945-1947, ROSENGARTEN 1926, C. H. FOERESTER AND J. BELCHER 1940.

Reference information

Bibliographic references

  • Deposit

    DALE, V.B., 1961, TUNGSTEN DEPOSITS OF GILA, YAVAPAI, MOHAVE COUNTIES, ARIZONA: USBM INFORMATION CIRCULAR 8078, P. 3.

  • Deposit

    USGS BULL 1141-H, 1965, PLATE I.

  • Deposit

    ABGMT CLIPPINGS FILE.

  • Deposit

    ABGMT-USBM FILE DATA.

  • Production

    USBM INFORMATION CIRCULAR 8078, P. 4.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-APR-1972 Gere, W. U.S. Geological Survey
Updater 01-JUL-1979 Hall, R. K. (Creasey, S. C.) 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 Arizona resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.