The Gravelly Valley is a manganese mine located in Lake 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.
Gravelly Valley MRDS details
Site Name
Primary: Gravelly Valley
Commodity
Primary: Manganese
Location
State: California
County: Lake
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Owner Name: Ed George And Others; Tex Young
Production
Not available
Deposit
Record Type: Site
Operation Category: Producer
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
Not available
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Analytical Data: PRIMARY ORE GRADE 20 TO 30 PERCENT MANGANESE.
Materials
Not available
Comments
Comment (Production): THIS IS THE ONLY MANGANESE MINE IN LAKE COUNTY THAT HAS PRODUCED DURING THE WAR PERIOD. ABOUT 1943, SEVERAL CARLOADS OF MANGANESE ORE WERE SOLD. THE PROPERTY WAS IDLE IN 1945. ORE SHIPMENTS FROM THIS PROPERTY BEGUN IN 1955 AND PROSPECTING AND MINING WERE BEING CONTINUED IN 1958.
Comment (Workings): IN 1958 AN EXTENSIVE OPEN CUT WHICH INCLUDES 5 BENCHES OF IRREGULAR EXTENT.
Comment (Geology): GEOL.DESC: MANGANIFEROUS BEDS ORIGINALLY IN THE CHERTS HAVE BEEN DEFORMED BY SMALL SCALE FAULTING, AND WERE MADE SUSEPTIBLE TO LEECHING AND OXIDIZING. FRIABLE MANGANESE OXIDE ORES ARE FOUND IN BRECCIATED ZONES, FROM PRIMARY MATERIAL THAT WAS PROBABLY MANGANIFEROUS CHERT, HYDROUS MANGANESE SILICATES, OR DISSEMINATED MANGANESE CARBONATE.
Comment (Deposit): FIVE MINERALIZED ZONES, 1500' ALONG STRIKE N 60 DEG W, MN OCCURS IN VUGGY ROCK IN CHERT AND SANDSTONE BEDS.
References
Reference (Deposit): CALIF. JOUR., VOL. 43, NO. 1, JAN. 1947, PP. 21-22
Reference (Deposit): CALIF. BULL.152, P. 91
Reference (Deposit): MIN. INF. SERVICE V. 11, NO. 11, P. 9; ADD. REF.: USBM RI 5579, P. 7-8
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.
