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Fortner Ranch Prospect

Occurrence in Calaveras 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. Links to other databases
  12. Bibliographic references
  13. Reporter information

Geologic information

Identification information

Deposit ID 10028845
MRDS ID M006074
Record type Site
Current site name Fortner Ranch Prospect
Related records 10235510

Geographic coordinates

Geographic coordinates: -120.66407, 38.22574 (WGS84)
Relative position 3.5 MI. NE OF SAN ANDREAS; ON CREST OF A RIDGE 0.3 MI. SE OF THE ROAD SW1/4

Site location context

Political divisions (FIPS codes)

Calaveras(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

San Andreas(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 004N 012E 04 California

Comments on the location information

  • LOCATED IN SW 1/4 SECTION 4

Commodities

Commodity Importance
Manganese Critical Tertiary

Materials information

Materials Type of material
Psilomelane Ore
Pyrolusite Ore
Spessartite Ore

Nearby scientific data

(1) -120.66407, 38.22574
ListMap

Economic information

Ore body information

  • Strike N 40 - 55 W
    Dip NEAR VERTICAL

Comments on the geologic information

  • GEOL.DESC: THE MANGANESE IS CHIEFLY IN THE FORM OF PARTLY OXIDIZED BROWN MANGANESE GARNET, SPESSARTITE, OCCURING IN A BED OF MASSIVE METACHERT. THE METACHERT HAS BEEN RECRYSTALLIZED TO FINE-GRAINED GRAY QUARTZITE, AND IS CUT BY QUARTZ VEINS UP TO 3' THICK. GENERAL STRIKE IS N. 40-55 DEG. W., DIP NEARLY VERTICAL. BELT OF METACHERT EXTENDS ALONG THE STRIKE FOR AT LEAST 450'. ONE PIT, 6 BY 6 BY 6'; A SECOND PIT, 350' TO THE NW, 2 BY 2 BY 2'; TWO ADDITIONAL PITS 100' NW OF PIT NO. 2 SPESSARTITE IS COATED WITH BLACK MANGANESE OXIDES; PYROLUSITE AND PSILOMELANE.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Significant No

Reference information

Bibliographic references

  • Deposit

    CALIF. B. 152, P. 42-43; B. 125, P. 106; B.76, P.31

  • Deposit

    EC MINERAL MAP NO.5, 1943

  • Deposit

    USBM R.I. 5579, P.22

  • Deposit

    REPT. 21 , P. 163 ; COUNTY REPT. NO. 2 , P. 212 AND PL. D; USGS MR-23

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.