Colorado

Past Producer in Mariposa county in California, United States with commodities Gold, Silver

Geologic information

Identification information

Deposit ID 10031125
MRDS ID M009719
Record type Site
Current site name Colorado
Alternate or previous names Colorado Quartz Mine

Geographic coordinates

Geographic coordinates: -119.97265, 37.55549 (WGS84)
Elevation 869
Relative position ABOUT 7 MILES N OF MARIPOSA NEAR HEAD OF SAXON CREEK
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Geographic areas

Country State County
United States California Mariposa

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 004S 018E 27 California

Comments on the location information

  • NR. CTR. OF SEC. IN SW 1/4 UTM EST.

Commodities

Commodity Importance
Gold Primary
Silver Secondary

Materials information

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

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock
    Stratigraphic age (youngest) Late Permian
  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Slate

Nearby scientific data

(1) -119.97265, 37.55549

Ore body information

  • General form PINCH AND SWELL
    Strike N 50 W
    Dip 70 NE
    Thickness 2.13M

Comments on the geologic information

  • GEOL.DESC: SANDY METASEDIMENTS HAVE BEEN INTRUDED BY GREENSTONE DIKES AND SILLS 1-3 FT THICK. VEIN AVE 1.5-2 FT THICK, CHIEFLY BANDED QUARTZ. ORE SHOOTS ARE 30 - 75 FT WIDE AND PITCH ABOUT 45 DEG. STRIKE AND DIP OF SLATY CLEAVAGE NEAR THE SHAFT IS ROUGHLY PARALLEL TO THE VEIN AND TO THE BEDDING PLANES.

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Production years 1915 - 1938

Mining district

District name Colorado

Ownership information

  • Type Operator
    Owner Corinne Kratzer, F. E. And P. W. Judkins, Et Al.

Production statistics

  • Year 1938
    Period - 1938
    Material ORE
    Accuracy Accurate
    Description Cp_Grade: ^.31 Oz/Ton Au
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 9g/mt
  • Year 1938
    Period - 1938
    Material AU
    Accuracy Accurate
    Description Cp_Grade: ^ .12 Oz/Ton Ag
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Silver Silver 3g/mt

Comments on the production information

  • NOTHING IS RECORDED OF EARLY PRODUCTION. IN THE LATE 1920'S ABOUT 2500 TONS OF ORE WAS MINED WHICH RAN $10 TO $11 PER TON WITH SOME DEVELOPMENT ROCK RUNNING $8. TOTAL PRODUCTION PROBABLY DOES NOT EXCEED $50,000 .

Comments on the workings information

  • 200-FT. INCLINED SHAFT, 500-FT. WORKING LEVEL, 200-FT. DRIFT, STOPE.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS M009719

Bibliographic references

  • Deposit

    BOWEN, O. E., JR., & GRAY, H., JR., 1957 , MINES AND MINERAL DEPOSITS OF MARIPOSA COUNTY, CALIF.: CALIF. JOUR. MINES & GEOL., VOL. 53 , NOS. 1 & 2 , P. 90 - 91 , 251 .

  • Deposit

    LAIZURE, C. MCK., 1928 , S. F. FIELD DIV.- MARIPOSA COUNTY: 24TH REPORT STATE MINERALOGIST, VOL. 24 , NO. 2 , P. 84 , 124 .

  • Deposit

    CASTELLO, W. O., 1921 , MARIPOSA COUNTY: 17TH REPORT STATE MINERALOGIST ( FOR 1920 ), P. 111 .

  • Production

    BOWEN AND GRAY, 1957

General comments

Subject category Comment text
Deposit QUARTZ VEIN
Deposit ONE PATENTED FRACTIONAL CLAIM OF 11 ACRES AND 2 UNPATENTED CLAIMS. VEIN MATTER IS CHIEFLY BANDED QUARTZ CARRYING FREE GOLD AND A LITTLE PYRITE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1973 Gere, W. U.S. Geological Survey
Updater 01-APR-1978 Tatkin, T.; Albers, J. U.S. Geological Survey