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Pocahontas Mine

Past Producer in Custer county in Colorado, United States with commodities Silver, 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. Production statistics
  19. Workings at the site
  20. Links to other databases
  21. Bibliographic references
  22. General comments
  23. Reporter information

Geologic information

Identification information

Deposit ID 10012438
MRDS ID D008070
Record type Site
Current site name Pocahontas Mine
Alternate or previous names South Leviathan, East Leviathan, Humboldt-Pocahontas vein

Geographic coordinates

Point of reference Pit
Geographic coordinates: -105.33613, 38.10473 (WGS84)
Elevation 2850
Location accuracy 10(meters)
Relative position 0.6 MILE N22E 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)

Federal lands

Bureau of Land Management(Bureau of Land Management CO)

Bureau of Land Management CO BLM(Type of land area)

BLM(Federal land areas administered by BLM)

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 NW OF NE 0F SW Colorado

Comments on the location information

  • SW SLOPE OF POCAHONTAS HILL, 1/2 MILE NORTH OF ROSITA, IN THE SW/4 SEC.28, T 22 S, R 71 W. INFO FROM LAND.ST :(1976)

Commodities

Commodity Importance
Silver Primary
Lead Secondary
Copper Secondary

Materials information

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

Alteration

  • (Local) Strongly Argillized

Mineral occurrence model information

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

Host and associated rocks

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

Nearby scientific data

Pit (1) -105.33613, 38.10473
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 N50W
    Dip S18-30W; ORE S45W
    Width 0.61M
    Depth to bottom 91.44M

Controls for ore emplacement

  • Humboldt-Pocahontas Vein; Mineralized Fissures

Comments on the geologic information

  • A fissure sulfide vein trends NW-SE and dips SW; traced for 4000 ft., it contained high-grade silver ore.

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
Year of first production 1874

Mining district

District name Rosita Hills District

Land status

Ownership category Private

Production statistics

  • Year 1893
    Period 1874-1878
    Material ore
    Ore mined 2300mt
    Accuracy Accurate

Comments on the production information

  • WITH HUMBOLDT PRODUCED OVER $900,000 BETWEEN 1874-1896

Comments on the reserve resource information

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

Workings at the site

  • Type of workings Underground
    Length 152.4M
    Overall depth 152.4M

Comments on the workings information

  • TWO SHAFTS, SEVERAL TUNNELS ON HANGING WALL SIDE; AT TIMES WORKED FROM HUMBOLDT MINE

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.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

  • Reserve-Resource

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

General comments

Subject category Comment text
Deposit THE ROSITA REDUCTION WORKS WERE BUILT TO TREAT ORES FROM THIS MINE ; INFO.SRC : 1 PUB LIT

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.