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Powderhorn No. 2 Mine

Past Producer in Gunnison county in Colorado, United States with commodity Vermiculite
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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. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Ore body information
  13. Economic information about the deposit and operations
  14. Mining district
  15. Land status
  16. Links to other databases
  17. Bibliographic references
  18. General comments
  19. Reporter information

Geologic information

Identification information

Deposit ID 10101899
MRDS ID D011390
Record type Site
Current site name Powderhorn No. 2 Mine
Related records 10191308, 10288402

Geographic coordinates

Geographic coordinates: -107.04006, 38.24861 (WGS84)
Elevation 2627
Location accuracy 1000(meters)
Relative position 21.0 MILES S 17 W FROM GUNNISON, Within 2000-Ft Radius, Within 2000-Ft Radius, Within 2000-Ft Radius, Within 2000-Ft Radius

Site location context

Political divisions (FIPS codes)

Gunnison(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Rudolph Hill(quadrangle 1:24,000 scale)

Montrose(quadrangle 1:100,000 scale)

Montrose(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Gunnison(hydrologic unit)

Gunnison(hydrologic accounting unit)

Gunnison(hydrologic subregion)

Upper Colorado(hydrologic region)

Geographic areas

Country State County
United States Colorado Gunnison

Public Land Survey System information

Meridian Township Range Section Fraction State
New Mexico 046N 002W 12 E2 Colorado

Comments on the location information

  • EXACT LOCATION WITHIN SECTION IS UNCERTAIN BUT COULD BE GROUP OF PROSPECTS ALONG ROAD IN S2 SE SE, FOR WHICH ELEV AND LAT-LONG ARE GIVEN; 3.6 MILES SE OF POWDERHORN AND 0.8 MILE SE OF IRON HILL. ; INFO FROM LAND.ST :1976

Commodities

Commodity Importance
Vermiculite Primary

Materials information

Materials Type of material
Augite Gangue
Biotite Gangue
Magnetite Gangue

Alteration

  • (Local) Alteration Of Biotite And/Or Phlogopite To Vermiculite

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Pyroxenite
    Rock unit name Pyroxenite;Carbonatite
    Rock description Pyroxenite;Carbonatite
    Stratigraphic age (youngest) Late Cambrian
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Pyroxenite

Nearby scientific data

(1) -107.04006, 38.24861
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Gunnison Uplift, San Juan Volcanic Field
Type of structure Local
Structure description Iron Hill Alkalic Complex, Cimarron Fault, Powderhorn Stock

Ore body information

  • General form LENTICULAR, TABULAR

Economic information about the deposit and operations

Development status Past Producer
Commodity type Non-metallic
Deposit size Small
Significant No

Mining district

District name White Earth (Powderhorn) District

Land status

Ownership category Private

Comments on the workings information

  • OPEN CUTS

Reference information

Bibliographic references

  • Deposit

    HEDLUND, D.C., AND OLSON, J.C., 1975, GEOLOGIC MAP OF THE POWDERHORN QUADRANGLE, GUNNISON AND SAGUACHE COUNTIES, COLORADO: USGS MAP GQ-1178.

  • Deposit

    BUSH, A.L., 1951, SOURCES OF LIGHTWEIGHT AGGREGATES IN COLORADO: COLORADO SCI. SOC. PROC., V. 15, NO. 8, P. 339-340.

  • Deposit

    LA PLANTE, F.R., 1943, GUNNISON COUNTY ACTIVITIES: COLORADO MINING ASSOC. 1943 MINING YEARBOOK, P. 35-36.

  • Deposit

    ALEXANDER, J.D., 1944, ALEXITE'S YEAR OF GROWTH: COLORADO MINING ASSOC. 1944 MINING YEARBOOK, P. 85.

  • Deposit

    OLSON, J.C., 1974, GEOLOGIC MAP OF THE RUDOLPH HILL QUADRANGLE, GUNNISON, HINSDALE, AND SAGUACHE COUNTIES, COLORADO: USGS MAP GQ-1177.

General comments

Subject category Comment text
Deposit ON EAST SIDE OF IRON HILL COMPLEX, PYRIXENITE IS CUT BY SWARM OF CARBONATITE DIKES TRENDING GENERALLY WNW-ESE IN RADIAL ORIENTATION TO MAIN CARBONATITE STOCK. VERMICULITE IS SPORADIC BUT LOCALLY ABUNDANT IN ALTERED PYROXENITE AS PODLIKE SEGREGATIONS AND DIKELIKE BODIES, RESULTING FROM WEATHERING OF BIOTITE OR PHLOGOPITE. BUSH (1951) DESCRIBES DEPOSIT AS BLANKET-TYPE ALTERATION ZONE OF UNCERTAIN EXTENT. LARGE PERCENTAGE OF VERMICULITE BOOKS ARE MORE THAN 0.5 INCH IN LONGEST DIMENSION WITH SOME UP TO 3 INCHES.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-84 Schwochow, Stephen D. 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.