1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Iron Duke

Past Producer in Mariposa county in California, United States with commodity Gold
Map
XML
JSON
KML
B
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. Controls for ore emplacement
  12. Economic information about the deposit and operations
  13. Mining district
  14. Workings at the site
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10076870
MRDS ID W024147
Record type Site
Current site name Iron Duke
Related records 10115227

Geographic coordinates

Geographic coordinates: -120.21655, 37.62214 (WGS84)
Elevation 488
Relative position 1/4 MILE SE OAKS & REESE MINE

Site location context

Political divisions (FIPS codes)

Mariposa(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Hornitos(quadrangle 1:24,000 scale)

Oakdale(quadrangle 1:100,000 scale)

San Jose(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Merced(hydrologic unit)

San Joaquin(hydrologic accounting unit)

San Joaquin(hydrologic subregion)

California(hydrologic region)

Federal lands

Bureau of Land Management(Bureau of Land Management CA)

Bureau of Land Management CA BLM(Type of land area)

BLM(Federal land areas administered by BLM)

Geographic areas

Country State County
United States California Mariposa

Public Land Survey System information

Meridian Township Range Section Fraction State
004S 016E 04 California

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Gold Ore
Marcasite Ore
Quartz Gangue

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Slate
    Stratigraphic age (youngest) Late Jurassic
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite

Nearby scientific data

(1) -120.21655, 37.62214
ListMap

Economic information

Ore body information

  • Strike N 30-35 W
    Dip 61 NE
    Thickness 1.22M
    Length 457.2M
    Depth to top 0M

Controls for ore emplacement

  • Fissure Ore Taken From Where Cutter Veins Join Blue Lead, Or From Cutter Veins Themselves.

Comments on the geologic information

  • GEOL.DESC: AMADOR GROUP

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Production years 1865 , 1934 - 1935 , 1938 - 1941

Mining district

District name Hunter Valley

Comments on the production information

  • TOTAL PRODUCTION $21,800 . DURING SINKING OF SHAFT, SMALL POCKET YIELDED 190 OZ AU. ONE POCKET IN SECONDARY DRIFT YIELDED $524 . $16,000 AU TAKEN FROM SPECIMEN HILL WORKING $3800 FROM SMALL STOPE AT JUNCTION BLUE LEAD & CUTTER VEIN AT 104 FT, $2000 FROM RAISE ON CUTTER #2. SULFIDE CONCENTRATES ABOUT $50 AU/TON

Workings at the site

  • Type of workings Underground
    Length 205.74M
    Overall depth 60.96M

Comments on the workings information

  • SINGLE COMPARTMENT 200 FT DEEP SHAFT INCLINED 61 DEG. 185 FT LEVEL DRIFT S TO CUTTER VEIN # 2 500 FT LONG, SECONDARY DRIFT 100 FT WEST, 30 FT RAISE. 75 FT DRIFT ON CUTTER VEIN 3 . PARTLY CAVED 35 FT SHAFT & SHALLOW SURFACE WORKINGS NEAR SPECIMEN HILL

Reference information

Bibliographic references

  • Deposit

    BOWEN, O. E., JR., GRAY, C. H., JR., 1957 , MINES AND MINERAL DEPOSITS OF MARIPOSA COUNTY, CALIFORNIA: CALIF. JOUR. MINES AND GEOLOGY, V. 53 , NOS. 1 AND 2 , PP 113 - 114 .

  • Deposit

    LAIZURE, C. MCK., 1928 , SAN FRANCISCO FIELD DIVISION IN TWENTY-FOURTH REPORT OF THE STATE MINERALOGIST: CALIFORNIA STATE MINING BUREAU, P. 133 .

  • Production

    BOWEN & GRAY 1957

General comments

Subject category Comment text
Deposit VEIN BLUE LEAD VEIN IS INTERSECTED BY CUTTER VEINS AT ANGLES OF 45 - 90 DEGREES. CUTTER VEINS IN GREENSTONE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JAN-1979 Bowman, J. And Albers, J. U.S. Geological Survey

Beyond USGS

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

External references

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.