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  3. Mineral Resource Data System (MRDS)

Horse Mountain

Past Producer in Humboldt county in California, United States with commodities Copper, Gold, Chromium
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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. Ownership information
  15. Production statistics
  16. Workings at the site
  17. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10030559
MRDS ID M008752
Record type Site
Current site name Horse Mountain
Alternate or previous names Copper Glance, Humboldt Copper
Related records 10139510

Geographic coordinates

Geographic coordinates: -123.72196, 40.86151 (WGS84)
Elevation 1402
Relative position 22 MILES (AIRLINE) FROM ARCATA

Site location context

Political divisions (FIPS codes)

Humboldt(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Grouse Mountain(quadrangle 1:24,000 scale)

Hayfork(quadrangle 1:100,000 scale)

Redding(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Trinity(hydrologic unit)

Klamath(hydrologic accounting unit)

Klamath-Northern California Coastal(hydrologic subregion)

California(hydrologic region)

Federal lands

Six Rivers 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 California Humboldt

Public Land Survey System information

Meridian Township Range Section Fraction State
Humboldt 006N 004E 33,34 California

Commodities

Commodity Importance
Copper Primary
Gold Secondary
Chromium Critical Secondary

Comments on the commodity information

  • CHALCOPYRITE OCCURS MAINLY IN DIORITE CHALCOCITE COMMON IN SCHIST AND HARDER DIORITE. BORNITE IS MOSTLY IN SCHIST, MALACHITE IN UPPER WORKINGS, NATIVE COPPER IS WIDELY DISTRIBUTED IN GABBRO.

Materials information

Materials Type of material
Bornite Ore
Chalcocite Ore
Chalcopyrite Ore
Chrysocolla Ore
Cuprite Ore

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro
  • Host or associated Host
    Rock type Metamorphic Rock > Serpentinite

Nearby scientific data

(1) -123.72196, 40.86151
ListMap

Economic information

Ore body information

  • General form LENTICULAR
    Strike NW
    Dip NE

Comments on the geologic information

  • GEOL.DESC: SCHIST DEVELOPED THROUGH METAMORPHIC ACTION, SCHIST AND DIORITE ARE PRINCIPAL GANGUE

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Production years 1918

Mining district

District name Horse Mountain

Land status

Ownership category National Forest

Ownership information

  • Type Operator
    Owner H. T. Weaver

Production statistics

  • Year 1918
    Material CR
    Accuracy Accurate
    Description Ap_Grade: ^40 - 45.75 %
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Chromium Chromium 43wt-pct

Comments on the production information

  • ORE AVERAGES 30 % SILICON, 15 % LIME AND 12 % IRON, 12 % OF ORE PRODUCED IN QUANTITY WILL BE HIGH - GRADE ( 10 - 50 % CU ) AND 10 % OF THE WHOLE CAN BE SORTED TO A PRODUCT CARRYING 15 % CU, REMAINDER MILLING ORE AVG. 3 - 5 % CU. CHROMITE OCCURS IN THE SERPENTINE AREAS.

Workings at the site

  • Type of workings Underground
    Area 809.4HA
    Length 2133.6M

Comments on the workings information

  • DEVELOPMENT CHART WITH DETAIL WORKINGS ON, P. 307 OF THE 21ST REPT. STATE MINERALOGIST.

Reference information

Bibliographic references

  • Deposit

    AVERILL, C.V., 1941 ; MINERAL RESOURCES OF HUMBOLDT COUNTY; 37TH REPT. STATE MIN.; DIV. OF MINES, P. 505 - 506 , 507 - 508 .

  • Deposit

    ERIC, J. C., 1948 , TABULATION OF COPPER DEPOSITS IN CALIFORNIA IN COPPER IN CALIFORNIA: CALIFORNIA DIVISION OF MINES BULLETIN 144, P 235

  • Deposit

    LAIZURE, C. MCK., 1925 ; SAN FRANCISCO FIELD DIVISION; 21ST REPT. STATE MIN.; CALIF. MIN. BUR., P. 305 - 308 .

  • Production

    LAIZURE, C. MCK., 1925

General comments

Subject category Comment text
Deposit PROBABILITY IS STRONG THAT ADDITIONAL BODIES OF CHROMITE CAN BE FOUND ( 1941 )

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1973 Gere, W. U.S. Geological Survey
Updater 01-FEB-1979 Fraticelli, L. A. (Albers, 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 California resources

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