1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Twenty Grand Claim

Prospect in Custer county in Colorado, United States with commodities Thorium, REE
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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. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Controls for ore emplacement
  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 10087731
MRDS ID D008871
Record type Site
Current site name Twenty Grand Claim
Related records 10166802

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -105.32918, 38.21084 (WGS84)
Elevation 2576
Location accuracy 50(meters)
Relative position 5.9 MILES N 07 E OF QUERIDA

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 021S 071W 21 NW OF SE OF NE Colorado

Comments on the location information

  • NEAR RESERVOIR AT HEADWATERS OF RALPH GULCH ; INFO FROM LAND.ST :1976

Commodities

Commodity Importance
Thorium Primary
REE Critical Primary

Materials information

Materials Type of material
Thorite Ore
Barite Gangue
Fluorite Gangue
Galena Gangue
Limonite Gangue
Pyrite Gangue
Quartz Gangue

Mineral occurrence model information

Model code 30
USGS model code 11d
Deposit model name Thorium-rare-earth veins

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Rock unit name Andesite
    Rock description Andesite
    Stratigraphic age (youngest) Cambrian
  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss
    Rock unit name Alaskitic Granite Gneiss
    Rock description Alaskitic Granite Gneiss

Nearby scientific data

Ore Body (1) -105.32918, 38.21084
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Wet Mountains
Type of structure Local
Structure description Nw-Trending Shear Zones

Controls for ore emplacement

  • Mineralized Veins

Economic information about the deposit and operations

Operation type Surface-Underground
Development status Prospect
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1952

Mining district

District name Wet Mountains Area; Mckinley Mountain Area

Land status

Ownership category Private

Comments on the workings information

  • SHAFT, PROSPECTS

Reference information

Bibliographic references

  • Deposit

    CHRISTMAN, R.A., BROCK, M.R., PEARSON, R.C. AND SINGEWALD, Q.D. 1959, GEOLOGY AND THORIUM DEPOSITS OF THE WET MOUNTAINS, COLORADO, A PROGRESS REPORT: USGS BULLETIN 1072-H, P.525-526

General comments

Subject category Comment text
Deposit Discovery Year: EARLY 1950'S

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-1982 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.