The Boston is a gold mine located in Calaveras county, California at an elevation of 1,201 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: 1,201 Feet (366 Meters)
Commodity: Gold
Lat, Long: 38.31944, -120.67444
Map: View on Google Maps
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.
Boston MRDS details
Site Name
Primary: Boston
Secondary: Boston Consolidated
Secondary: Esperanza
Commodity
Primary: Gold
Secondary: Lead
Secondary: Zinc
Secondary: Copper
Location
State: California
County: Calaveras
Land Status
Not available
Holdings
Not available
Workings
Type: Surface/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
Analytical Data: 3 - 4 % AURIFEROUS IRON SULFIDES
Materials
Ore: Gold
Ore: Galena
Ore: Pyrite
Gangue: Quartz
Comments
Comment (Workings): IN 1892 SURFACE ORE BEING MINED, 1893 - EXTENSIVE UNDERGROUND MINING STARTED AND A 1000 FT SHAFT WAS COMPLETE IN 1900 3 PATENTED AND 6 UNPATENTED CLAIMS. 1000 FT INCLINED SHAFT WITH LEVELS AT 50 , 100 , 200 , 300 , 500 , 700 AND 950 FT. MOST OF ORE MINED AT 150 FT LEVEL DURING LATER OPERATIONS, NO DEEP DEVELOPMENT UNDER TAKEN. GLORY HOLE OVER 50 FT LEVEL NUMEROUS CROSSCUTS, DRIFTS, RAISES ETC
Comment (Geology): VEIN IN CALAVERAS FMN CONSISTS LOCALLY OF LIMESTONE, SCHIST AND SERPENTINE INTRUDED BY DIORITE.
Comment (Commodity): ZINC AND COPPER SULFIDES PRESENT, AVERAGE ORE GRADE $35 PER TON AU WITH HIGHGRADE POCKETS ENCOUNTERED
Comment (Deposit): VEIN, VEIN IS CHRUSHED DIORITE DIKE AND CONTAINS INCLUSIONS OF HOST ROCK (SCHHIST). AT 100 FT MINE LEVEL VEIN 40 - 50 FT THICK. AT 300 FT LEVEL FOOTWALL IS HARD BLACK DIKE WITH MARBLE BETWEEN IT AND VEIN, ON HANGING WALL TO N THERE IS GROUND-UP QUARTZ WITH SUCCESSIVE LAYERS OF SERPENTINE, LIMESTONE AND BLACK SCHIST
Comment (Production): ACTIVE DURING 1870'S, 1892 - 1900 , 1920 - 1925 , 1933 - 1935 , FROM 1935 - 1937 A SMALL AMOUNT OF WORK WAS DONE WITH LITTLE PRODUCTION. TOTAL OUTPUT OF MINE ESTIMATED AT $1 MIL. HIGH GRADE POCKETS ENCOUNTERED. AVERAGE GRADE OF ORE DURING 30'S BASED ON $35 PER OZ AU
References
Reference (Deposit): CLARK, W.B., LYDON, P.A., 1962 , MINES AND MINERAL RESOURCES OF CALAVERAS COUNTY, CALIF.; COUNTY REPORT 2 ; CALIF. DIV. OF MINES AND GEOLOGY, P 43 , 140 AND PL B
Reference (Deposit): CRAWFORD, J.J., 1894 , CALAVERAS COUNTY: 12TH REPT. STATE MIN.; CALIF. MIN. BUR. P 90
Reference (Deposit): LOGAN, C.A., 1925 , SACRAMENTO FIELD DIVISION, 21ST REPT. STATE MIN.; CALIF. MINING BUR., P. 145 - 146
Reference (Deposit): CLARK, W.B., LYDON, P.A., 1962 , MINES AND MINERAL RESOURCES OF CALAVERAS COUNTY, CALIF.; COUNTY REPORT 2 ; CALIF. DIV. OF MINES AND GEOLOGY, P 245 , 299
Reference (Production): CLARK ( 1962 )
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.
