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  3. Mineral Resource Data System (MRDS)

Thomas Brothers Group

Past Producer in Calaveras 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. Ore body information
  11. Economic information about the deposit and operations
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10029173
MRDS ID M006567
Record type Site
Current site name Thomas Brothers Group
Alternate or previous names Ho, Yellow Bird, Golden Poppy, Lucky Boy, Rose Marie, Tip Top, Coarse Gold, Mt. Bullion, Cave City, Al, Wheelock
Related records 10235231

Geographic coordinates

Geographic coordinates: -120.51045, 38.19685 (WGS84)
Relative position 5 MI NW OF MURPHYS

Site location context

Political divisions (FIPS codes)

Calaveras(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Calaveritas(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 013E 14,23 California

Comments on the location information

  • UTM ACC. ON ONEIL'S CR. CTR. S 1/2 SEC 14

Commodities

Commodity Importance
Gold Primary

Comments on the commodity information

  • SOME HIGH GRADE POCKETS

Materials information

Materials Type of material
Gold Ore
Quartz Gangue

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Schist > Mica Schist

Nearby scientific data

(1) -120.51045, 38.19685
ListMap

Economic information

Ore body information

  • Strike N & E
    Dip S
    Thickness 4.57M

Comments on the geologic information

  • LIMESTONE TO NE. THIN VEINS. QTZ LEDGE 3-15 FT THICK

Economic information about the deposit and operations

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

Comments on the workings information

  • 100 FT CROSSCUT DRIVEN NW ON VEIN. 100 FT DRIFT TO E AST.

Reference information

Bibliographic references

  • Deposit

    CLARK, W. B., & LYDON, P. A., 1962 , MINES AND MINERAL RESOURCES OF CALAVERAS COUNTY, CALIF.: CALIF. DIV. MINES & GEOL., COUNTY REPORT 2, P. 36, 184 & PL. B

  • Deposit

    LOGAN, C. A., FRANKE, H., 1936 , MINES AND MINERAL RESOURCES OF CALAVERAS CO.: CDM CALIF. JOUR. MINES & GEOL., VOL. 32, P. 277, 323

General comments

Subject category Comment text
Deposit VEIN, POCKETS 3-15 FT IN THICKNESS.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-1979 Hayden, F. (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.