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Black Rock Group

Past Producer in Maricopa county in Arizona, United States with commodity Manganese
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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. Geologic structures
  11. Ore body information
  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. Workings at the site
  19. Links to other databases
  20. Bibliographic references
  21. General comments
  22. Reporter information

Geologic information

Identification information

Deposit ID 10027086
MRDS ID M001971
Record type Site
Current site name Black Rock Group
Alternate or previous names Black Warrior, Black Rock Nos. 1, 3
Related records 10234934

Geographic coordinates

Geographic coordinates: -113.17687, 33.7395 (WGS84)
Elevation 732
Relative position NINE MILES NNW OF BIG HORN PEAK SUMMIT.

Site location context

Political divisions (FIPS codes)

Maricopa(county)

Arizona(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Little Horn Peak(quadrangle 1:24,000 scale)

Salome(quadrangle 1:100,000 scale)

Phoenix(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Centennial Wash(hydrologic unit)

Lower Gila-Agua Fria(hydrologic accounting unit)

Lower Gila(hydrologic subregion)

Lower Colorado(hydrologic region)

Federal lands

Bureau of Land Management(Bureau of Land Management AZ)

Bureau of Land Management AZ BLM(Type of land area)

BLM(Federal land areas administered by BLM)

Geographic areas

Country State County
United States Arizona Maricopa

Public Land Survey System information

Meridian Township Range Section Fraction State
Gila and Salt River 005N 009W 34 NE4 Arizona

Comments on the location information

  • 20 MILES S OF AGUILA. ; INFO FROM LAND.ST :(1978)

Commodities

Commodity Importance
Manganese Critical Primary

Materials information

Materials Type of material
Manganite Ore
Psilomelane Ore
Pyrolusite Ore
Calcite Gangue
Quartz Gangue

Host and associated rocks

  • Host or associated Associated
    Rock type Metamorphic Rock > Gneiss
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Pyroclastic Rock > Tuff
    Rock unit name Basalt, Andesite, Tuffs, Flow Breccia
    Rock description Basalt, Andesite, Tuffs, Flow Breccia

Economic information

Geologic structures

Type of structure Regional
Structure description Little Horn Peak Fault

Ore body information

  • General form WEDGE
    Strike NW-SE
    Dip 45 DEGREES E
    Length 190.5M
    Width 7.62M

Controls for ore emplacement

  • Ore Occurs Near Contact Of Volcanic With Basement. Sone Movement Has Occurred Along This Contact

Comments on the geologic information

  • ORE FOUND IN N-TRENDING FRACTURE ZONES, 2-8 FT WIDE.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Significant No
Discovery year 1916

Mining district

District name Aguila District

Land status

Ownership category BLM Administrative Area

Ownership information

  • Type Owner
    Owner Big Horn Mining Co.
    First year 1960

Production statistics

  • Year 1954
    Period 1952-1954
    Accuracy Estimate
    Description Cp_Grade: ^30 To 35 Percent Mn
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Manganese Manganese 33wt-pct

Comments on the production information

  • IN 1954 PRODUCTION WAS 250 TONS PER MONTH . UNRECORDED SMALL PRODUCTION PRIOR TO 1952

Workings at the site

  • Type of workings Surface/Underground
    Length 274.32M
    Overall depth 103.63M
    Overall length 30.48M
    Overall width 1.22M

Comments on the workings information

  • OPEN PIT, MANY ADITS

Comments on development

  • OPERATORS INCLUDED: A. R. BUELL,(1952), MOHAVE MINING AND MILLING CO.(1957-1958). PROPERTY CONSISTS OF 3 CLAIMS.

Reference information

Bibliographic references

  • Deposit

    FARNHAM, L.L, AND STEWART, L.A., 1958, MN DEPOSITS OF WESTERN ARIZONA, U.S.B.M. INFORMATION CIRCULAR 7843.

  • Deposit

    ADMR BLACK ROCK FILE

  • Deposit

    USBM-FILE DATA-CLUSTER NUMBER 604-BLACK ROCK MINE

  • Deposit

    ALLEN, G.B., 1985, ECONOMIC GEOLOGY OF THE BIG HORN MOUNTAINS OF WEST-CENTRAL ARIZONA: ARIZONA BUREAU OF GEOLOGY AND MINERAL TECHNOLOGY OPEN-FILE REPORT 85-17, 140 P.

General comments

Subject category Comment text
Deposit THE ORE BODY IS WEDGE SHAPED AND ROUGHLY L-SHAPED. THE AREA OCCUPIES A DOWN DROPPED FAULT BLOCK.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JAN-1981 Harner, Joy L. (Peterson, Jo) U.S. Geological Survey
Updater 01-NOV-1990 Bolm, Karen 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 Arizona resources

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