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Pioneer Mine

Producer in San Diego county in California, United States with commodity Talc-Soapstone
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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. Alteration
  9. Host and associated rocks
  10. Nearby scientific data
  11. Ore body information
  12. Economic information about the deposit and operations
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10107288
MRDS ID W007469
Record type Site
Current site name Pioneer Mine
Related records 10164880

Geographic coordinates

Geographic coordinates: -117.16753, 33.03338 (WGS84)

Site location context

Political divisions (FIPS codes)

San Diego(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Rancho Santa Fe(quadrangle 1:24,000 scale)

Oceanside(quadrangle 1:100,000 scale)

Santa Ana(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

San Diego(hydrologic unit)

Laguna-San Diego Coastal(hydrologic accounting unit)

Southern California Coastal(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
013S 003W 23 California

Commodities

Commodity Importance
Talc-Soapstone Primary

Materials information

Materials Type of material
Pyrophyllite Ore

Alteration

  • (Local) Silicification

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Dacite
    Stratigraphic age (youngest) Late Jurassic
    Stratigraphic age (youngest) Late Jurassic
    Stratigraphic age (youngest) Late Jurassic
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Dacite
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Latite
    Rock unit name Santiago Peak Volcanics
    Rock description Santiago Peak Volcanics

Nearby scientific data

(1) -117.16753, 33.03338
ListMap

Economic information

Ore body information

  • General form LINEAR, LENS
    Thickness 4.57M
    Length 45.72M

Comments on the geologic information

  • SCHIST IN ALTERED ZONES IN ANDESITIC TO RHYOLITIC FLOWS, BRECCIAS, AND TUFFS. SANTIAGO PEAK VOLCANICS CONTAIN LATITE TO QUARTZ DACITE; ANDESITIC AND RHYOLITIC FLOWS, BRECCIAS AND TUFFS.

Economic information about the deposit and operations

Development status Producer
Commodity type Non-metallic
Deposit size Large
Significant No

Comments on the production information

  • 10,000 TO 11,000 TONS HAVE BEEN MINED

Comments on the reserve resource information

  • POSSIBLE REMAINING RESERVES 75,000 TONS

Comments on development

  • WORKED MAINLY 1945 - 1950; INTERMITTENTLY SINCE THEN

Reference information

Bibliographic references

  • Deposit

    JAHNS, R. H., AND LANCE, J. F., 1950, GEOLOGY OF THE SAN DIEGUITO PYROPHYLLITE AREA, SAN DIEGO COUNTY, CALIFORNIA: CALIF. DIV. MINES, SPECIAL REPORT 4, 32 P

  • Production

    JAHNS, R.H., AND LANCE, J.F., 1950, CALIF. DIV. MINES, SPEC. REPT. 4, 32 P.

General comments

Subject category Comment text
Deposit DEPOSIT IS ADEQUATELY STUDIED

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-1959 Espenshade, Gilbert H. 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.