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Mica Gem

Occurrence in San Diego county in California, United States with commodity Tungsten
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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. Host and associated rocks
  9. Nearby scientific data
  10. Ore body information
  11. Economic information about the deposit and operations
  12. Links to other databases
  13. Bibliographic references
  14. Reporter information

Geologic information

Identification information

Deposit ID 10008654
MRDS ID D000982
Record type Site
Current site name Mica Gem
Alternate or previous names Randsburg
Related records 10286572

Geographic coordinates

Geographic coordinates: -116.13416, 32.6334 (WGS84)
Relative position 4 1/2 MILES EAST NE FROM JACUMBA

Site location context

Political divisions (FIPS codes)

San Diego(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Jacumba(quadrangle 1:24,000 scale)

El Cajon(quadrangle 1:100,000 scale)

San Diego(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Salton Sea(hydrologic accounting unit)

Southern Mojave-Salton Sea(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California San Diego

Public Land Survey System information

Meridian Township Range Section Fraction State
San Bernardino 017S 008E 35 California

Commodities

Commodity Importance
Tungsten Critical Tertiary

Materials information

Materials Type of material
Scheelite Ore
Muscovite Gangue
Quartz Gangue

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Pegmatite
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Granite

Nearby scientific data

(1) -116.13416, 32.6334
ListMap

Economic information

Ore body information

  • Length 3.66M
    Width 2.44M

Comments on the geologic information

  • GEOL.DESC: PEGMATITE DIKES WORKED FOR MICA IN 1938-1943, NO TUNGSTEN.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Significant No

Reference information

Bibliographic references

  • Deposit

    WEBER, H.F., 1963; GEOLOGY AND MINERAL RESOURCES, SAN DIEGO CA.; COUNTY REPT. 3; CA. DIV. OF MINES OF GEOLOGY, P. 277.

  • Deposit

    LEMMON, D.M., AND TWETO, O.L., 1962, TUNGSTEN IN THE U.S., USGS MAP, MR-25.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1974 Elliott, James E. U.S. Geological Survey
Updater 01-JAN-1980 Fraticelli, L. A. (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.