Boston

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

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.

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.