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Boston

Past Producer in Calaveras county in California, United States with commodities Gold, Lead, Zinc, Copper
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Host and associated rocks
  9. Nearby scientific data
  10. Ore body information
  11. Economic information about the deposit and operations
  12. Workings at the site
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10028912
MRDS ID M006167
Record type Site
Current site name Boston
Alternate or previous names Boston Consolidated, Esperanza
Related records 10260289

Geographic coordinates

Geographic coordinates: -120.67545, 38.31935 (WGS84)
Elevation 366
Relative position 2 MI NE OF MOKELUMNE HILL ON INDIAN CREEK

Site location context

Political divisions (FIPS codes)

Calaveras(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Mokelumne Hill(quadrangle 1:24,000 scale)

San Andreas(quadrangle 1:100,000 scale)

Sacramento(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Mokelumne(hydrologic unit)

San Joaquin(hydrologic accounting unit)

San Joaquin(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California Calaveras

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 005N 012E 05 California

Commodities

Commodity Importance
Gold Primary
Lead Secondary
Zinc Critical Secondary
Copper Secondary

Comments on the commodity information

  • ZINC AND COPPER SULFIDES PRESENT, AVERAGE ORE GRADE $35 PER TON AU WITH HIGHGRADE POCKETS ENCOUNTERED

Materials information

Materials Type of material
Galena Ore
Gold Ore
Pyrite Ore
Quartz Gangue

Analytical data

Result 3 - 4 % AURIFEROUS IRON SULFIDES

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
  • Host or associated Host
    Rock type Metamorphic Rock > Schist

Nearby scientific data

(1) -120.67545, 38.31935
ListMap

Economic information

Ore body information

  • Strike N
    Dip 30 - 40 E
    Width 15.24M

Comments on the geologic information

  • VEIN IN CALAVERAS FMN CONSISTS LOCALLY OF LIMESTONE, SCHIST AND SERPENTINE INTRUDED BY DIORITE.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No

Comments on the production information

  • 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

Workings at the site

  • Type of workings Surface/Underground
    Area 74.06HA
    Overall depth 204.52M

Comments on the workings information

  • 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

Reference information

Bibliographic references

  • 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

  • Deposit

    CRAWFORD, J.J., 1894 , CALAVERAS COUNTY: 12TH REPT. STATE MIN.; CALIF. MIN. BUR. P 90

  • Deposit

    LOGAN, C.A., 1925 , SACRAMENTO FIELD DIVISION, 21ST REPT. STATE MIN.; CALIF. MINING BUR., P. 145 - 146

  • 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

  • Production

    CLARK ( 1962 )

General comments

Subject category Comment text
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

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-1979 Mateik, R.; Albers, John P. U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative California resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.