The F. J. Long is a manganese mine located in Mendocino 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.
F. J. Long MRDS details
Site Name
Primary: F. J. Long
Commodity
Primary: Manganese
Location
State: California
County: Mendocino
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Owner Name: Terry
Production
Not available
Deposit
Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Physiography
General Physiographic Area: Pacific Mountain System
Physiographic Province: Pacific Border Province
Physiographic Section: California Coast Ranges
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Analytical Data: ORE GRADE 35 TO 40 PERCENT MANGANESE
Materials
Not available
Comments
Comment (Geology): GEOL.DESC: BLACK MANGANESE OXIDE ORE IN THIN BEDDED WHITE AND BUFF CHERT. ORE HAS CORES AND PATCHES OF WHITE SILICA. ORE IN SECOND PIT IS MORE SILICEOUS. GREENSTONE IS EXPOSED S. AND E. OF THE PROSPECT, AND QUARTZ MICA SCHIST IS EXPOSED TO THE W.
Comment (Production): NO PRODUCTION RECORDED. ABOUT 10 TONS OF MANGANESE ORE OBTAINED FROM ONE CUT IS PILED BY ITS SIDE;IT IS BLACK OXIDE ORE WITH CORES AND PATCHES OF WHITE SILICA, ESTIMATED TO CONTAIN 35 TO 40 PERCENT MANGANESE.
Comment (Workings): OPEN CUTS
References
Reference (Deposit): CALIF. DIV. OF MINES BULL. 125, P. 137
Reference (Deposit): D.O.M. BULL. 152, P. 130
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.
