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  3. Mineral Resource Data System (MRDS)

Martinez

Occurrence in El Dorado county in California, United States with commodity Manganese
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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. Ore body information
  10. Economic information about the deposit and operations
  11. Ownership information
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10095088
MRDS ID M007705
Record type Site
Current site name Martinez

Geographic coordinates

Geographic coordinates: -120.82158, 38.6374 (WGS84)
Relative position 5 MI SE OF EL DORADO, LOCATED NEAR MARTINEZ GOLD MINE ( SECTIONS 12 , 13 ).

Site location context

Political divisions (FIPS codes)

El Dorado(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Placerville(quadrangle 1:24,000 scale)

Placerville(quadrangle 1:100,000 scale)

Sacramento(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Cosumnes(hydrologic unit)

San Joaquin(hydrologic accounting unit)

San Joaquin(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California El Dorado

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 009N 010E 13 California

Comments on the location information

  • LOCATED IN NE 1/4 SECTION 13

Commodities

Commodity Importance
Manganese Critical Tertiary

Materials information

Materials Type of material
Psilomelane Ore
Pyrolusite Ore
Rhodonite Ore

Analytical data

Result ORE GRADE 20 TO 30 PERCENT MANGANESE

Nearby scientific data

(1) -120.82158, 38.6374
ListMap

Economic information

Ore body information

  • Strike N 5 E
    Dip 60 W
    Thickness 0.91M
    Length 3.05M

Comments on the geologic information

  • GEOL.DESC: RHODONITE PARTIALLY ALTERED TO PSILOMELANE AND PYROLUSITE IN LENSES CUT BY NUMEROUS QUARTZ VEINS ( 3 TO 6 IN. THICK ). TWO LENSES ARE EXPOSED AT SITE SURROUNDED WITH SERICITE SCHIST; BEING 3 FT. THICK, 10 AND 5 FT. LONG. IRON OXIDES ARE ASSOCIATED WITH THE MANGANESE IN ONE LENS. ORE RUNS 20 TO 30 % MN AND IS VERY HIGH IN SILICA.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Significant No

Ownership information

  • Type Operator
    Owner Martinez Gold Mines Co.

Comments on the production information

  • UNDEVELOPED.

Comments on the workings information

  • SMALL DEPOSITS.

Reference information

Bibliographic references

  • Deposit

    CALIF. JOUR. MINES & GEOL. V. 52, NO. 4, P. 575, PL. 10

  • Deposit

    DOM BULL. 152, P. 52

General comments

Subject category Comment text
Deposit COUNTRY ROCK IS CHERT AND SCHIST.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1972 Gere, W. U.S. Geological Survey
Updater 01-APR-1977 Von Dohlen, E.; Albers, J. 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.