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Black Rock Mine

Past Producer in La Paz county in Arizona, United States with commodities Lead, Silver, Zinc, Fluorine-Fluorite, Manganese, Molybdenum
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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. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Ore body information
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  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 10027198
MRDS ID M002447
Record type Site
Current site name Black Rock Mine
Alternate or previous names Pacific Mines
Related records 10113536

Geographic coordinates

Geographic coordinates: -114.5944, 33.0909 (WGS84)
Elevation 229
Relative position 36 MI. FROM DOME AND 1 MI. S. OF RED CLOUD, 4 MI NW OF COLORADO RIVER.

Site location context

Political divisions (FIPS codes)

La Paz(county)

Arizona(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Picacho(quadrangle 1:24,000 scale)

Trigo Mountains(quadrangle 1:100,000 scale)

Salton Sea(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Imperial Reservoir(hydrologic unit)

Lower Colorado(hydrologic accounting unit)

Lower Colorado(hydrologic subregion)

Lower Colorado(hydrologic region)

Geographic areas

Country State County
United States Arizona La Paz

Public Land Survey System information

Meridian Township Range Section Fraction State
Gila and Salt River 004S 023W 11;12 SE (11); SW (12) Arizona

Comments on the location information

  • INFO FROM LAND.ST :01, 49?

Commodities

Commodity Importance
Lead Primary
Silver Primary
Zinc Critical Primary
Fluorine-Fluorite Critical Tertiary
Manganese Critical Tertiary
Molybdenum Tertiary

Materials information

Materials Type of material
Anglesite Ore
Galena Ore
Limonite Ore
Pyrolusite Ore
Smithsonite Ore
Wulfenite Ore
Calcite Gangue
Fluorite Gangue
Quartz Gangue

Alteration

  • (Local) Schist Is Silicified, Chloritized, & Carbonatized For 50 Ft From Vein

Analytical data

Result 4.87% PB
Result 9.8% ZN
Result 6.7 OZS OF AG/TON

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Pliocene
  • Host or associated Host
    Rock type Metamorphic Rock > Schist

Nearby scientific data

(1) -114.5944, 33.0909
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Complex Faulting And Fracturing Have Affected The Schist. Black Rock Follows A Fault Zone

Ore body information

  • General form VUGS & IRREGULAR MASSES
    Strike N65W
    Dip 40NE
    Length 609.6M
    Width 5.49M
    Depth to bottom 82.3M

Controls for ore emplacement

  • Vein Occurs Within A Fault Zone

Economic information about the deposit and operations

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

Mining district

District name Silver District

Ownership information

  • Type Owner
    Owner Black Rock Mining And Reduction Co.

Production statistics

  • Year 1941
    Accuracy Estimate
    Description Ap_Grade: ^5.3% Pb, 1.7 Oz Ag/Ton
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Silver Silver 48g/mt
    Ore Lead Lead 5wt-pct

Comments on the production information

  • PRODUCTION UNDER RED ROCK-BLACK ROCK MINE. RICH PB-AG ORE PRODUCED FROM 1883-1887 BUT AMOUNT UNKNOWN. DUMP RETREATED IN 1948-1949 TOGETHER WITH OTHER DUMPS.

Workings at the site

  • Type of workings Surface/Underground
    Length 274.32M
    Overall depth 128.02M

Comments on the workings information

  • SHAFT, ADIT, PIT.

Comments on development

  • PREVIOUS OWNERS INCLUDE PENN METALS, INC, RILEY & HOLMES; PATENTED IN 1880

Reference information

Bibliographic references

  • Deposit

    PARKER, F.Z., 1966, THE GEOLOGY AND MINERAL DEPOSITS OF THE SILVER DISTRICT, TRIGO MOUNTAINS; YUMA COUNTY, ARIZONA: MASTER THESIS SAN DIEGO STATE COLLEGE, P. 118-126.

  • Deposit

    WILSON, E.D., 1951, ARIZONA ZINC AND LEAD DEPOSITS: ARIZ. B.M. BULLETIN 158, P. 93.

  • Deposit

    WILSON, E.D., 1933, GEOLOGY AND MINERAL DEPOSITS OF SOUTHERN YUMA COUNTY, ARIZONA; ARIZ. B.M. BULLETIN 134, P. 67.

  • Deposit

    KEITH, S.B., 1978, INDEX OF MINING PROPERTIES IN YUMA COUNTY, ARIZONA; ARIZONA BUREAU OF MINES BULLETIN 192, P. 175.

  • Deposit

    PHILLIPS, K.A., 1987, ARIZONA INDUSTRIAL MINERALS: ARIZONA DEPARTMENT OF MINES AND MINERAL RESOURCES MINERAL REPORT 4, 185 P.

  • Other Database

    CIMRI

  • Production

    KEITH, S.B., 1978.

General comments

Subject category Comment text
Deposit LENSING ORE SHOOTS.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-APR-1972 Gere, W. U.S. Geological Survey
Updater 01-OCT-1979 Hall, R. K. (Creasey, S. C.) U.S. Geological Survey
Updater 01-DEC-1992 Orris, Greta J. U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

External references

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.