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Madrid Mine True Blue

Producer in Calaveras county in California, United States with commodity Chromium
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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. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Land status
  12. Ownership information
  13. Links to other databases
  14. Bibliographic references
  15. Reporter information

Geologic information

Identification information

Deposit ID 10109168
MRDS ID M006371
Record type Site
Current site name Madrid Mine True Blue
Related records 10138217

Geographic coordinates

Geographic coordinates: -120.51295, 38.14297 (WGS84)
Relative position 1/2 MI. S OF SAN DOMINGO CREEK AT ELEV. OF ABOUT 2000' IN THE SW1/4 OF THE SEC. SP. REPT. 40, P. 21, SAYS THIS MINE IS ON THE NE SIDE OF PONDEROSA WAY IN THE SW1/4 NE1/4 OF THE SEC.

Site location context

Political divisions (FIPS codes)

Calaveras(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Calaveritas(quadrangle 1:24,000 scale)

San Andreas(quadrangle 1:100,000 scale)

Sacramento(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Calaveras(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 003N 013E 02 California

Commodities

Commodity Importance
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Ore

Nearby scientific data

(1) -120.51295, 38.14297
ListMap

Economic information

Comments on the geologic information

  • GEOL.DESC: IRREGULAR, BROKEN LENS OF NEARLY MASSIVE AND MEDIUM-GRADE DISSEMINATED CHROMITE, STRIKE N. 80 DEG. W., DIP 65 DEG. SW; MAXIMUM THICKNESS OF 12'; COUNTRY ROCK IS A SCHISTOSE, ALTERED SERPENTINE. SAID TO BE SOME ASBESTOS IN SEC. 2 (CDM BULL. 195)

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Significant No

Mining district

District name Murphy Area

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner Genochio, A.
    First year 1943
  • Type Owner
    Owner M. S. Shepard
    Home office C/O S. Murphy, San Mateo, Ca.
    First year 1975

Comments on the production information

  • 1039 LONG TONS OF 30% CHROMIC OXIDE. IDLE SINCE 1943.

Comments on the workings information

  • OPEN PIT AND INCLINED SHAFT. CONSIDERABLE ORE SAID TO REMAIN IN THE BOTTOM OF THE WORKINGS.

Reference information

Bibliographic references

  • Deposit

    CALIF. B. 134, PT. III, CH. 2, P. 56-57 AND PL. 5

  • Deposit

    CALIF. B. 76, P. 123; REPT. 21, P. 165; SP. REPT. 40, P. 21 AND PL. 1 AND 2; CALIF. COUNTY REPT. NO. 2, P. 22, 129 AND PL. D

  • Deposit

    USGS MAP GQ-222; CDM BULL. 195, P. 18

  • Deposit

    STINSON, M.C., 1975, CDMG MINERAL PROP. REPT., UNBB.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1972 Gere, W. U.S. Geological Survey
Updater 01-SEP-1982 Oster, Karel L. (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.