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Blackstone

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. Geologic structures
  11. Ore body information
  12. Economic information about the deposit and operations
  13. Mining district
  14. Links to other databases
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10029299
MRDS ID M006751
Record type Site
Current site name Blackstone
Related records 10114142

Geographic coordinates

Geographic coordinates: -120.57434, 38.38797 (WGS84)
Elevation 610
Relative position 2 1/2 MI W.S.W. OF WEST POINT BETWEEN MIDDLE AND NORTH FORKS OF MOKELUMNE RIVER

Site location context

Political divisions (FIPS codes)

Calaveras(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

West Point(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 006N 013E 08 California

Comments on the location information

  • UTM ACC, CENTER W 1/2 SEC

Commodities

Commodity Importance
Gold Primary
Lead Secondary
Zinc Critical Secondary
Copper Secondary

Comments on the commodity information

  • FREE GOLD, ORE ALMOST ALWAYS ASSOCIATED WITH GALENA, FAULTS BOUND ORE SHOOTS, MASSIVE PARTS OF VEIN BARREN. ORE AVERAGES 1/2 - 1 OZ PER TON AU WITH HIGH GRADE POCKETS PRESENT

Materials information

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

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite

Nearby scientific data

(1) -120.57434, 38.38797
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Several Nearly W. Striking Faults Several W To N Striking Verticle, Fine-Grained Basic To Intermed. Composition Dikes Cut Vein And Country Rock

Ore body information

  • Strike N 10 W
    Dip 45 W
    Thickness 2.44M

Comments on the geologic information

  • GEOL.DESC: BLACKSTONE VEIN IS MOST DEVELOPED OF 6 PARALLEL VEINS. VEIN SYSTEM CONTINUES TO NORTH AND SOUTH AND RANGES FROM 6 IN TO 8 FT IN THICKNESS. SEVERAL W TO N STRIKING VERTICLE, FINE-GRAINED BASIC TO INTERMED. COMPOSITION DIKES CUT VEIN AND COUNTRY ROCK.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Medium
Significant No
Production years 1933 - 1951

Mining district

District name West Point

Comments on the production information

  • ORE COMMONLY AVERAGES 1/2 TO 1 OZ OF GOLD PER TON OF ORE BUT HIGH GRADE POCKETS PRESENT. MOST RECENT ORE FROM N. PITCHING ORE SHOOT WITH STOPE LENGTH OF 200 FT IN UPPER LEVELS; 475 FT IN FROM LOWER LEVEL ADIT PORTAL, ANOTHER POCKET WAS 100 FT IN FROM THIS ENTRANCE. TOTAL PRODUCTION ESTIMATED $200000. WAS ACTIVE IN 1957.

Comments on the workings information

  • PROPERTY CONSISTS OF 9 CLAIMS. DEVELOPED BY 500 FT LOWER LEVEL ADIT, THREE OTHER BEARING DRIFT ADITS APPROX 100 FT APART ABOVE LOWER LEVEL RANGE FROM 600 - 700 FT IN LENGTH. NEAR CREST OF HILL IS 95 FT SHAFT WITH 160 FT N DRIFT AND 140 FT S. DRIFT. ADIT LEVELS CONNECTED BY RAISES. SHORT ADIT 200 FT DOWN HILL FROM LOWER LEVEL

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 38 - 39 , 42 - 43 , 138 AND PLB

  • Production

    CLARK ( 1962 )

General comments

Subject category Comment text
Deposit VEINS, 6 PARALLEL VEINS WITH BLACKSTONE BEING THE MOST DEVELOPED. VEIN SYSTEM CONTINUES TO N AND SOUTH AND RANGES FROM 1/2 TO 8 FT IN THICKNESS

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.