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Pioneer Mine

Past Producer in Custer county in Colorado, United States with commodities Silver, Gold, Lead, 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. Ore body information
  14. Controls for ore emplacement
  15. Economic information about the deposit and operations
  16. Mining district
  17. Land status
  18. Ownership information
  19. Workings at the site
  20. Links to other databases
  21. Bibliographic references
  22. Reporter information

Geologic information

Identification information

Deposit ID 10012433
MRDS ID D008060
Record type Site
Current site name Pioneer Mine
Alternate or previous names Big Bonnie, Claims: Rocky Point, Delta Fox, Sunset

Geographic coordinates

Point of reference Pit
Geographic coordinates: -105.33974, 38.11029 (WGS84)
Elevation 2804
Location accuracy 10(meters)
Relative position 1.0 MILES N 34 W 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 NW OF SW NE Colorado

Comments on the location information

  • ON SADDLE BETWEEN MT ROBINSON AND PRINGLE HILL, IN THE N/2 SEC.29, T 22 S, R 71 W; INFO FROM LAND.ST :(1976)

Commodities

Commodity Importance
Silver Primary
Gold Primary
Lead Secondary
Copper Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Covellite Ore
Galena Ore
Malachite Ore
Pyrite Ore
Silver Ore
Stephanite Ore
Tetrahedrite Ore
Barite Gangue
Calcite Gangue
Clay Gangue

Alteration

  • (Local) Strong Argillization

Mineral occurrence model information

Model code 105
USGS model code 25a-d
Deposit model name Epithermal vein, generic
Mark3 model number 119
Model code 82
USGS model code 22
Deposit model name Epithermal veins

Host and associated rocks

  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Trachyte
    Stratigraphic age (youngest) Oligocene
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Rock unit name Rosita Andesite;Game Ridge Trachyte
    Rock description Rosita Andesite;Game Ridge Trachyte
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Pyroclastic Rock > Volcanic Breccia (Agglomerate)

Nearby scientific data

Pit (1) -105.33974, 38.11029
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Rosita Volcanic Center, Wet Mtns
Type of structure Local
Structure description Rosita Fault

Ore body information

  • Strike N 50 W
    Dip S 18-30 W; ORE S 45-70 W
  • Strike N 50 W
    Dip S 18-30 W; ORE S 45-70 W

Controls for ore emplacement

  • At Intersection Of Humboldt-Pocahontas Vein And Pioneer Vein

Comments on the geologic information

  • Vein trends N15W, dips 65 east, and intersects Leavenworth vein; ore is concentrated near the intersection.

Economic information about the deposit and operations

Operation type Underground
Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1874

Mining district

District name Rosita Hills District

Land status

Ownership category Federal

Ownership information

  • Type Owner
    Owner Art Williams
    Home office Rockvale, Co.
    First year 1959

Comments on the production information

  • CREDITED BY MINT WITH $110,000 AU AND $37,000 AG PRODUCTION; GOLD VALUES DOUBTFUL

Comments on the reserve resource information

  • A 1981 report suggested that low-grade, bulk-tonnage silver deposits may occur along the Pioneer vein and south of the Leavenworth-Humboldt-Pocahontas vein. (Sunshine files)

Workings at the site

  • Type of workings Underground
    Overall depth 121.92M

Comments on the workings information

  • 235 FT SHAFT, 850 FT TUNNEL ADVANCED IN 1959

Comments on development

  • LAST DEVELOPMENT KNOWN IN 1960

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.N., 1978, GEOLOGIC MAP OF THE SILVER CLIFF AND ROSITA VOLCANIC CENTERS, CUSTER COUNTY, COLORADO: USGS MAP I-1081, 1:24,000.

  • Production

    EMMONS, S.F., 1896

  • 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 31-MAR-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.