The Pioneer Chief Mine is a gold mine located in Calaveras 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.
Pioneer Chief Mine MRDS details
Site Name
Primary: Pioneer Chief Mine
Secondary: Thorn
Commodity
Primary: Gold
Location
State: California
County: Calaveras
Land Status
Not available
Holdings
Not available
Workings
Type: Underground
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
General Physiographic Area: Pacific Mountain System
Physiographic Province: Cascade-Sierra Mountains
Physiographic Section: Sierra Nevada
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Gold
Gangue: Quartz
Comments
Comment (Workings): WORKINGS HAVE BEEN EXTENDED LATERALLY AND IN DEPTH FOR AT LEAST TWO PERIODS. EARLY IN 1931 A VERTICAL SHAFT WAS EXTENDED TO DEPTH OF 415 FT. 200-FT LEVEL WAS RUN FOR 125-FT. 350-FT LEVEL WAS 230-FT LONG, AND 500-FT LEVEL HAD BEEN RUN 60 FT. RECENT DEVELOPMENT WORK WAS DISAPPOINTING.
Comment (Geology): 5 FT THICK VEIN W 40 FT OF GOUGE ON HANGING WALL SLATE HANGING WALL, GREENSTONE FOOTWALL. LOGAN, 1935 , SAYS FOOTWALL IS A DIKE OF CHLORITIC FELSITE & HANGING WALL IS SERPENTINE
Comment (Commodity): SAMPLING IN 1930'S INDICATED GRADE TOO LOW TO WARRANT PRODUCTION
Comment (Location): UTM EST W 1/2 LOT 37
Comment (Production): ACTIVE IN 1860'S, BUT WORK CEASED IN 1884 . REOPENED IN 1916 , WORKED INTERMITTENTLY TILL 1930'S . PRODUCTION IN 1928 AVERAGED $2/TON AU.
Comment (Deposit): VEIN
References
Reference (Deposit): CLARK, W.B., & LYDON, P.A., 1962 , MINES AND MINERAL RESOURCES OF CALAVERAS COUANTY, CALIF.: CALIF. DIV. MINES & GEOL., COUNTY REPORT 2 , P. 174 & PL B
Reference (Deposit): LOGAN, C.A., FRANKE, H., 1936 , MINES AND MINERAL RESOURCES OF CALAVERAS CO.: CDM CALIF. JOUR. MINES & GEOL., VOL. 32 , NO. 3 , P. 316
Reference (Deposit): LOGAN, C.A., 1935 , MOTHER LODE GOLD BELT OF CALIF.: CDM BULL. 108 , P 146 & PL 6
Reference (Production): LOGAN, 1935
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.
