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  3. Mineral Resource Data System (MRDS)

Philadelphia Group

Past Producer in Tuolumne county in California, United States with commodity Gold
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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. Economic information about the deposit and operations
  11. Land status
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10077958
MRDS ID W026042
Record type Site
Current site name Philadelphia Group
Alternate or previous names Boston Rhode Island

Geographic coordinates

Geographic coordinates: -120.22571, 37.84492 (WGS84)
Elevation 853
Relative position ABOUT 2 MILES S. OF TUOLUMNE, ON THE E. SIDE OF THE N. FORK OF THE TUOLUMNE RIVER.

Site location context

Political divisions (FIPS codes)

Tuolumne(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Groveland(quadrangle 1:24,000 scale)

Oakdale(quadrangle 1:100,000 scale)

San Jose(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Tuolumne(hydrologic unit)

San Joaquin(hydrologic accounting unit)

San Joaquin(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California Tuolumne

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 001N 016E 16,21 California

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Gold Ore

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Slate

Nearby scientific data

(1) -120.22571, 37.84492
ListMap

Economic information

Comments on the geologic information

  • GEOL.DESC: VEIN 10 TO 30 INCHES THICK IN BLUISH-GRAY SLATE CONTAINING LARGE PERCENT OF PYRITE.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No

Land status

Ownership category Private

Comments on the workings information

  • 3 ADITS 60 , 450 , AND 320 FT.

Reference information

Bibliographic references

  • Deposit

    CRAWFORD, J.J., 1896 , THIRTEENTH REPT. OF THE STATE MINERALOGIST: CMB REPT. 13 , P. 488

General comments

Subject category Comment text
Deposit THIS GROUP IS A RELOCATION OF THE OLD MARTIN MINE. MOST OF THE SIGNIFICANT DONE BEFORE 1900 .

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-1978 Albers, J.; Tatkin, T. 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.