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Alexander Shaft

Prospect in Custer county in Colorado, United States with commodities Silver, Copper
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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. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  16. Land status
  17. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10012169
MRDS ID D007634
Record type Site
Current site name Alexander Shaft

Geographic coordinates

Geographic coordinates: -105.34974, 38.10807 (WGS84)
Elevation 2783
Relative position 0.95 MILES N44W FROM ROSITA, CO

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 29 NE OF SE OF NW Colorado

Comments on the location information

  • NEAR INVINCIBLE SHAFT AND PRINGLE HILL ; INFO FROM LAND.ST :(1976)

Commodities

Commodity Importance
Silver Primary
Copper Secondary

Materials information

Materials Type of material
Covellite Ore
Malachite Ore
Barite Gangue
Calcite Gangue

Alteration

  • (Local) Strong 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) > Intermediate Volcanic Rock > Andesite
    Rock unit name Rosita Andesite
    Rock description Rosita Andesite
    Stratigraphic age (youngest) Oligocene
    Stratigraphic age (youngest) Oligocene
    Stratigraphic age (youngest) Oligocene
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite

Nearby scientific data

(1) -105.34974, 38.10807
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Rosita Crater And Cauldron Complex
Type of structure Local
Structure description North-Trending Fissures Dipping About 65 Degrees East

Controls for ore emplacement

  • NW trending fault system

Comments on the geologic information

  • THE ROSITA ANDESITE IS RELATIVELY FRESH HERE

Economic information about the deposit and operations

Operation type Underground
Development status Prospect
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1882

Mining district

District name Rosita

Land status

Ownership category Federal

Comments on development

  • A SHAFT WAS SUNK TO AN UNKNOWN DEPTH

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 MAPS I-1081.

General comments

Subject category Comment text
Deposit Discovery Year: 1870-1895

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1981 Collins, Donna B. 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.