The Dufrene is a mine located in Amador 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
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Dufrene MRDS details
Site Name
Primary: Dufrene
Commodity
Tertiary: Manganese
Location
State: California
County: Amador
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Owner Name: Fred Dufrene
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: 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: Rhodonite
Ore: Psilomelane
Ore: Pyrolusite
Gangue: Magnetite
Comments
Comment (Production): THE BEST EXPOSURE OF MANGANESE OXIDES IS IN THE SOUTHERN MOST CUT WHERE THE CENTER OF THE METACHERT IS MOSTLY OF OXIDES, CHIEFLY HARD BLUE-BLACK PSILOMELANE; THIS BED PROBABLY CONTAINS 45 PERCENT MANGANESE. SOME OF THE BLACK OXIDE ORE IS GOOD GRADE BUT THE AMOUNT AVAILABLE IS SMALL
Comment (Workings): SMALL SHAFT AND A SERIES OF OPEN CUTS
Comment (Location): LOCATED IN SW 1/4 SECTION 27
Comment (Geology): GEOL.DESC: ORE LIES IN BED OF MANGANIFEROUS META-CHERT 5 TO 8 FT. THICK; STRIKING N 5 - 15 W; DIPPING 65 - 75 E. THE METACHERT IS ENCLOSED IN METAVOLCANICS (IN PAST GREENSTONE) AND META-TUFFS. THE FORMATION IS THOUGHT TO BE THE AMADOR GROUP. THE META-CHERT IS MASSIVE AND THICK BEDDED; IN PART CHALCEDONIC TO OPALINE; IN PART CRYSTALLIZED TO FINE GRAINED QUARTZITE. MANGANESE OXIDES OCCUR AS BANDS, CRUSTS, AND POCKETS IN THE METACHERT. AMOUNT OF OXIDE PRESENT SMALL AND SMALL AMOUNT OF RHODONITE IS PRESENT. OXIDE WHERE IDENTIFIED IS HARD, BLUE BLACK PSILOMELANE. AT SOME PLACES META-CHERT IS CUT BY BANDS OR VEINLETS 1/2 TO 1 IN. WIDE OF MAGNETITE
References
Reference (Deposit): CALIF. JOUR. MINES & GEOL. V. 50, NO. 1, JAN. 1954, P.268, PL. 1
Reference (Deposit): DOM BULL. 152, P.28
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.
