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
Elevation: 4,600 Feet (1,402 Meters)
Commodity: Copper
Lat, Long: 40.86167, -123.72083
Map: View on Google Maps
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.
Horse Mountain MRDS details
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.
