Horse Mountain

The Horse Mountain is a copper mine located in Humboldt county, California at an elevation of 4,600 feet.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: Horse Mountain
Secondary: Copper Glance
Secondary: Humboldt Copper

Commodity

Primary: Copper
Secondary: Gold
Secondary: Chromium

Location

State: California
County: Humboldt
District: Horse Mountain

Land Status

Land ownership: National Forest
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.

Holdings

Not available

Workings

Type: Underground

Ownership

Owner Name: H. T. Weaver

Production

Year: 1918
Material type: CR
Description: Ap_Grade: ^40 - 45.75 %

Deposit

Record Type: Site
Operation Category: Past Producer
Deposit Type: Vein
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

General Physiographic Area: Pacific Mountain System
Physiographic Province: Pacific Border Province
Physiographic Section: California Coast Ranges

Mineral Deposit Model

Not available

Orebody

Form: LENTICULAR

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Cuprite
Ore: Chalcopyrite
Ore: Chrysocolla
Ore: Bornite
Ore: Chalcocite

Comments

Comment (Workings): DEVELOPMENT CHART WITH DETAIL WORKINGS ON, P. 307 OF THE 21ST REPT. STATE MINERALOGIST.

Comment (Geology): GEOL.DESC: SCHIST DEVELOPED THROUGH METAMORPHIC ACTION, SCHIST AND DIORITE ARE PRINCIPAL GANGUE

Comment (Commodity): 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.

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

Comment (Production): 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.

References

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

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

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

Reference (Production): LAIZURE, C. MCK., 1925

California Gold

"Where to Find Gold in California" looks at the density of modern placer mining claims along with historical gold mining locations and mining district descriptions to determine areas of high gold discovery potential in California. Read more: Where to Find Gold in California.