The Mason and Thayer is a gold mine located in Trinity county, California at an elevation of 4,199 feet.
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
Elevation: 4,199 Feet (1,280 Meters)
Commodity: Gold
Lat, Long: 40.84194, -123.01667
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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.
Mason and Thayer MRDS details
Site Name
Primary: Mason and Thayer
Secondary: Craig
Commodity
Primary: Gold
Secondary: Copper
Location
State: California
County: Trinity
District: Canyon Creek
Land Status
Land ownership: National Forest
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.
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: Pacific Border Province
Physiographic Section: Klamath Mountains
Mineral Deposit Model
Not available
Orebody
Form: LENSES
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Analytical Data: BODY OF BASE ORE ASSAYED. $3-$5/TON IN GOLD LOGAN REPORTS THAT SEVERAL YEARS PREVIOUS TO 1926, 880 SAMPLES FROM ALL PARTS OF THE MINE AVG. $7.10/TON FOR AVERAGE THICKNESS OF ABOUT 3 FT.
Materials
Ore: Chalcopyrite
Ore: Gold
Gangue: Calcite
Gangue: Quartz
Comments
Comment (Production): LATER STATEMENTS BY AVERILL INDICATE ABOUT 9000-10,000 TONS OF $6 ORE WAS PRODUCED. NO OTHER PRODUCTION DATA FOUND
Comment (Deposit): VEINS. ORE SHOOT 170 FT. LONG, 3 FT. THICK. QUARTZ CUTS SCHIST AT ALMOST A RIGHT ANGLE TO SCHISTOSITY. VEIN 3 IN.-6 FT. THICK. ORE EXTREMELY STREAKY AND IRREGULAR.
Comment (Workings): MILL-TUNNEL LEVEL,2000 FT. LONG, 1200 FT. OF WHICH WAS DRIFTING 70 FT. ABOVE, 260 FT. OF DRIFTS. 2 RAISES BETWEEN THESE LEVELS. 60 FT. HIGHER, 260 FT. OF DRIFTS AND A RAISE TO SURFACE. 350 FT. OF DRIFTING DONE A BODY OF BASE ORE IN ADIT BELOW MILL-TUNNEL LEVEL. LOGAN (1926) DESCRIBES AT LEAST 4 LEVELS OF WORKINGS.
Comment (Geology): DIORITIC DIKES, 6-60 FT. THICK, CUT SCHIST. SOME PYRITE OCCURS IN COARSE CUBES.
Comment (Deposit): 17 CLAIMS ; INFO.SRC : 1 PUB LIT
Comment (Location): UTM ACC. LAND UNSURVEYED FOR TOWNSHIP-RANGE. PROJECTED
References
Reference (Deposit): BROWN, G. CHESTER, 1913, THE COUNTIES OF SHASTA, SISKIYOU AND TRINITY: CALIFORNIA JOURNAL OF MINES AND GEOLOGY, V. 14, PT. 4, P. 887
Reference (Deposit): AVERILL, C.V., 1933, GOLD DEPOSITS OF THE REDDING AND WEAVERVILLE QUADRANGLES CALIFORNIA JOURNAL OF MINES AND GEOLOGY, V. 29, P. 36
Reference (Deposit): LOGAN, C.A., 1926, TRINITY COUNTY: CALIF. JOUR. MINES AND GEOLOGY, V. 22, P. 16-17
Reference (Deposit): FERGUSON, 1912, GOLD LODES OF WEAVERVILLE QUADRANGLE: U.S. GEOLOGICAL SURVEY BULL. 540, P. 78
Reference (Production): LOGAN (1926) AVERILL (1933)
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.
