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California Shaft

Past Producer in Custer county in Colorado, United States with commodities Silver, Lead
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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. Mineral occurrence model information
  10. Host and associated rocks
  11. Nearby scientific data
  12. Geologic structures
  13. Ore body information
  14. Controls for ore emplacement
  15. Economic information about the deposit and operations
  16. Mining district
  17. Land status
  18. Workings at the site
  19. Links to other databases
  20. Bibliographic references
  21. Reporter information

Geologic information

Identification information

Deposit ID 10012288
MRDS ID D007839
Record type Site
Current site name California Shaft

Geographic coordinates

Point of reference Pit
Geographic coordinates: -105.32001, 38.11001 (WGS84)
Elevation 2810
Location accuracy 10(meters)
Relative position 1.3 MILES N42E FROM ROSITA, CO., within 10m

Site location context

Political divisions (FIPS codes)

Custer(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Rosita(quadrangle 1:24,000 scale)

Canon City(quadrangle 1:100,000 scale)

Pueblo(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Arkansas Headwaters(hydrologic unit)

Upper Arkansas(hydrologic accounting unit)

Upper Arkansas(hydrologic subregion)

Arkansas-White-Red(hydrologic region)

Geographic areas

Country State County
United States Colorado Custer

Public Land Survey System information

Meridian Township Range Section Fraction State
6th Principal 022S 071W 28 SE OF NE OF NE Colorado

Comments on the location information

  • AT NORTH END OF GAME RIDGE, ABOUT 1-1/4 MILE NE OF ROSITA, IN THE NE/4 NE/4 SEC. 28, T 22 S, R 71 W; INFO FROM LAND.ST :(1976)

Commodities

Commodity Importance
Silver Primary
Lead Secondary

Materials information

Materials Type of material
Galena Ore
Barite Gangue

Alteration

  • (Local) Weak Argillization

Mineral occurrence model information

Model code 82
USGS model code 22
Deposit model name Epithermal veins

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Trachyte
    Rock unit name Trachyte Of Game Ridge;Undivided Gneiss; Dark, Augite-Gneiss
    Rock description Trachyte Of Game Ridge;Undivided Gneiss; Dark, Augite-Gneiss
    Stratigraphic age (youngest) Miocene
    Stratigraphic age (youngest) Oligocene
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Trachyte

Nearby scientific data

Pit (1) -105.32001, 38.11001
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Rosita Volcanic Center, Wet Mtns
Type of structure Local
Structure description California Fault Separates Trachyte And Gneiss

Ore body information

  • General form vein
    Strike NORTHWEST
    Dip VERTICAL 20 FT, THEN WESTERLY 70 DEGREES

Controls for ore emplacement

  • California Fault; Contact Between Trachyte And Gneiss

Comments on the geologic information

  • SHAFT PENETRATES GNEISS THEN FOLLOWS VEIN (FAULT) BETWEEN TRACHYTE AND GNEISS

Economic information about the deposit and operations

Operation type Underground
Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1883
Year of first production 1883

Mining district

District name Rosita Hills District

Land status

Ownership category BLM Administrative Area

Comments on the reserve resource information

  • A 1981 report suggested that low-grade, bulk-tonnage silver deposits may occur in this area. (Sunshine files)

Workings at the site

  • Type of workings Underground
    Length 18.29M
    Overall depth 18.29M

Comments on the workings information

  • SHAFT FOLLOWED DIP

Reference information

Bibliographic references

  • Deposit

    CROSS, WHITMAN, 1896, GEOLOGY OF SILVER CLIFF AND THE ROSITA HILLS, COLORADO: USGS 17TH ANN. REPORT, PT 2, P. 263-403.

  • Deposit

    SHARP, W.M., 1978, GEOLOGIC MAP OF THE SILVER CLIFF AND ROSITA VOLCANIC CENTERS, CUSTER COUNTY, COLORADO: USGS MAP I-1081.

  • Deposit

    Emmons, S.F., 1896, The mines of Custer County, Colorado: U.S. Geological Survey 17th Annual Report, Pt. 2, pp. 405-472.

  • Reserve-Resource

    Sunshine Mining Co. Colorado exploration files, unpublished data, Colorado Geological Survey.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-81 Collins, Donna B. Colorado Geological Survey
Updater 05-APR-06 Beach, Richard A. Colorado Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Colorado resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.