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  3. Mineral Resource Data System (MRDS)

Mountain Boy Mine

Past Producer in Custer county in Colorado, United States with commodities Silver, Lead, Zinc
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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 10101709
MRDS ID D007674
Record type Site
Current site name Mountain Boy Mine
Alternate or previous names Jackpot No. 1, Midnight

Geographic coordinates

Point of reference Pit
Geographic coordinates: -105.32418, 38.12918 (WGS84)
Elevation 2758
Location accuracy 10(meters)
Relative position 2.25 MILES N14E 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

Mount Tyndall(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 16 SE OF SW OF SE Colorado

Comments on the location information

  • SE OF MOUNT TYNDALL , 0.6 MILE DUE EAST OF QUERIDA ; IN THE NE/4 SEC. 21, T 22 S, R 71 W; INFO FROM LAND.ST :(1976)

Commodities

Commodity Importance
Silver Primary
Lead Secondary
Zinc Critical Secondary

Materials information

Materials Type of material
Galena Ore
Sphalerite Ore
Pyrite Gangue
Calcite Gangue
Quartz Gangue

Alteration

  • (Local) Strong Argillization, Very Bleached

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

Pit (1) -105.32418, 38.12918
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Rosita Volcanic Center, Wet Mtns
Type of structure Local
Structure description Numerous Small Faults; Near Volcanic Vent; Near Bassick Breccia Pipes

Controls for ore emplacement

  • Mineralized Fissures Near Bassick Breccia Pipes

Comments on the geologic information

  • DECOMPOSED GLASS ALTERED TO CLAY FOUND IN PLACES

Economic information about the deposit and operations

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

Mining district

District name Rosita Hills District

Land status

Ownership category Private

Comments on the reserve resource information

  • A 1981 report suggested that low-grade, bulk-tonnage silver deposits may occur along the Mountain Boy-Contact vein. (Sunshine files)

Comments on the workings information

  • TUNNEL DRIVEN IN TRACHYTE DIKE 3 TO 6 FT WIDE; TUNNEL RUNS NORTH PARALLEL TO DEMOCRAT TUNNEL; CROSSCUT TO DEMOCRAT TUNNEL AT ABOUT 435 FT FROM ENTRANCE; DRIFTS RUN FROM BOTH TUNNELS AT VARIOUS ANGLES

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

    EMMONS, S.F., 1896, THE MINES OF CUSTER COUNTY, COLORADO: USGS 17TH ANN. REPORT, PT 2, P. 405-472.

  • Deposit

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

  • Reserve-Resource

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

General comments

Subject category Comment text
Deposit DEPOSIT FOLLOWS TRACHYTE DIKE

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1981 Collins, Donna B. Colorado Geological Survey
Updater 01-DEC-1981 Collins, Donna B. U.S. Geological Survey
Updater 04-APR-2006 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.