The Leona Heights is a copper mine located in Alameda county, California.
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.
Leona Heights MRDS details
Site Name
Primary: Leona Heights
Secondary: Leona
Commodity
Primary: Copper
Secondary: Gold
Tertiary: Zinc
Location
State: California
County: Alameda
Land Status
Not available
Holdings
Not available
Workings
Type: Underground
Ownership
Owner Name: Blowski Copper Co. (-; Bank Of America
Years: 1950 - 1934
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Discovery Year: 1891
Years of Production:
Organization:
Significant: N
Deposit Size: M
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
Type: L
Description: Hayward Fault: Two Parallel Smaller Faults With Horizontal Displacement.
Alterations
Not available
Rocks
Name: Rhyolite
Role: Host
Age Type: Host Rock Unit
Age Young: Pliocene
Name: Rhyolite
Role: Host
Age Type: Host Rock
Age Young: Pliocene
Name: Rhyolite
Role: Host
Age Type: Associated Rock
Age Young: Pliocene
Analytical Data
Analytical Data: 47.8 % S, 40.9 % FE, 1.7 % CU, .80 DOLLARS/TON AU .53 OUNCES/TON AG
Materials
Ore: Epsomite
Ore: Bornite
Ore: Chalcocite
Ore: Hematite
Ore: Copper
Ore: Pyrite
Ore: Sphalerite
Ore: Limonite
Ore: Chalcopyrite
Ore: Chalcanthite
Comments
Comment (Workings): IN 1929 THERE WAS ABOUT 3000 FT. OF DEVELOPMENT
Comment (Commodity): PYRITE IS THE MAJOR ORE COMPONENT
Comment (Production): TOTAL VALUES ARE COMBINED FROM BOTH THE ALMA AND LEONA HEIGHTS MINE
Comment (Deposit): OVERLAIN BY GOSSAN
Comment (Geology): GEOL.DESC: LEONA RHYOLITE OCCUPIES NARROW BELT ALONG FRONT OF BERKELEY HILLS FROM HAMILTON GULCH IN BERKELEY TO A POINT 5 MILES SE OF HAYWARD. RHYOLITE IS A LAVA FLOW ALONG CONTACT BETWEEN KNOXVILLE SHALE AND FRANCISCAN. ROCKS ARE FRACTURED AND ALTERED BY SURFACE AGENTS, FOUR DISTINCT FACIES, BASED ON TEXTURE, GLASSY-SPHERALITIC-PORPHYRITIC-FELSITIC.
Comment (Deposit): ADD. REF. NO.4. GQ768 SHOWS MINE DUMP IN SEC. 3; DOM MIN. INF. SVCE. V. 11, NO. 5, P.2; DOM BULL. 176, P.450, 451, 619; USGS FOLIO, SAN FRANCISCO, NO. 193, P.22; NOTES FROM MACE, C. H.,GEOLOGY AT LEONA PHYOLITE,MINING AND ENG. WORLD, V. 35, P. 1320, 1911. HE SAYS THERE WERE SEVERAL MINES ALONG FOOTHILLS FOR 2-3 MI. ALMA AND SYNDICATE MINES AT NORTH, LEONA HEIGHTS IN CENTER, HOTEL MINE AT SOUTH. HE BELIEVES ORE IS AT CONTACT OF RHYOLITE AND UNDERLYING FRANCISCAN.PYRITE IS DISTRIBUTED THROUGHOUT RHYOLITE (LAWSON SAYS THIS ALSO)
References
Reference (Deposit): CLARK, C.W., 1917 : GEOLOGY AND ORE DEPOSITS OF LEONA RHYOLITE: UNIV. CALIF. PUB., BULL. OF DEPT. GEOLOGY, VOL. 10 , NO. 20 , PP 361 - 382
Reference (Deposit): DAVIS, F.F., 1950 ; MINES AND MINERAL RESOURCES ALAMEDA COUNTY; CALIF. JOUR. MINES AND GEOLOGY, VOL. 46 , NO. 2 ; DIV. OF MINES, P. 305 - 307
Reference (Deposit): LAIZURE, C.V., 1929 ; SAN FRANCISCO FIELD DIV.; 25TH REPT. STATE MIN.; CALIF. DIV. OF MINES, P. 440 - 441
Reference (Production): ERIC, J.H., 1948
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.
