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  3. Mineral Resource Data System (MRDS)

Twin Sisters

Past Producer in Nevada county in California, United States with commodities Gold, Arsenic
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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. Mining district
  13. Land status
  14. Workings at the site
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10007579
MRDS ID C011763
Record type Site
Current site name Twin Sisters
Related records 10115767

Geographic coordinates

Geographic coordinates: -120.8052, 39.43183 (WGS84)
Elevation 945
Relative position 2 MI. S EUREKA

Site location context

Political divisions (FIPS codes)

Nevada(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Alleghany(quadrangle 1:24,000 scale)

Truckee(quadrangle 1:100,000 scale)

Chico(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Yuba(hydrologic unit)

Lower Sacramento(hydrologic accounting unit)

Sacramento(hydrologic subregion)

California(hydrologic region)

Federal lands

Tahoe National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States California Nevada

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 018N 010E 12,13 California

Commodities

Commodity Importance
Gold Primary
Arsenic Critical Tertiary

Materials information

Materials Type of material
Gold Ore
Quartz Gangue

Host and associated rocks

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

Nearby scientific data

(1) -120.8052, 39.43183
ListMap

Economic information

Ore body information

  • Strike N
    Dip 45 W
    Depth to top 0M

Comments on the geologic information

  • SO. PAC. CO. DESCRIBES WALL ROCKS AMPHIBOLITE SCHIST & GABBRO

Economic information about the deposit and operations

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

Mining district

District name Alleghany

Land status

Ownership category National Forest

Workings at the site

  • Type of workings Surface/Underground
    Length 304.8M

Comments on the workings information

  • 2 ADITS, INCLINE

Reference information

Bibliographic references

  • Deposit

    LOGAN, C. A., 1924 , SACRAMENTO FIELD DIVISION: CALIFORNIA JOURNAL OF MINES AND GEOLOGY, VOL. 20 , NO. 4 , P. 11 .

  • Deposit

    CRAWFORD, J. J., 1896 , THIRTEENTH REPORT OF THE STATE MINERALOGIST: CALIFORNIA JOURNAL OF MINES AND GEOLOGY, VOL. 13 , P. 265 .

  • Deposit

    SOUTHERN PACIFIC COMPANY, 1964 , MINERALS FOR INDUSTRY, NORTHERN CALIFORNIA, V. 2 , P. 39 .

General comments

Subject category Comment text
Deposit VEINS, 18 - 50 IN. THICK
Deposit GROUP OF 3 CLAIMS ; INFO.SRC : 1 PUB LIT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-1979 Bowman, J. And 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.