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  3. Mineral Resource Data System (MRDS)

Keystone Lode

Occurrence in Custer county in South Dakota, United States with commodities Mica, Beryllium, Lithium
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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. Host and associated rocks
  9. Nearby scientific data
  10. Ore body information
  11. Economic information about the deposit and operations
  12. Mining district
  13. Land status
  14. Ownership information
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10055768
MRDS ID SD02513
Record type Site
Current site name Keystone Lode

Geographic coordinates

Geographic coordinates: -103.70168, 43.7419 (WGS84)
Elevation 1707
Location accuracy 500(meters)
Relative position 5.5 MILES SOUTHWEST OF CUSTER, SOUTH DAKOTA

Site location context

Political divisions (FIPS codes)

Custer(county)

South Dakota(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Fourmile(quadrangle 1:24,000 scale)

Mount Rushmore(quadrangle 1:100,000 scale)

Hot Springs(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Angostura Reservoir(hydrologic unit)

Cheyenne(hydrologic accounting unit)

Cheyenne(hydrologic subregion)

Missouri(hydrologic region)

Federal lands

Black Hills National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States South Dakota Custer

Public Land Survey System information

Meridian Township Range Section Fraction State
Black Hills 003S 003E 36 SE South Dakota

Commodities

Commodity Importance
Mica Primary
Beryllium Critical Primary
Lithium Critical Primary

Materials information

Materials Type of material
Amblygonite Ore
Beryl Ore
Muscovite Ore
Albite Gangue
Hornblende Gangue
Microcline Gangue
Pyrrhotite Gangue
Quartz Gangue

Analytical data

Result 5% OF THE PEGMATITE IS MICA. THE BERYL CRYSTALS ARE PALE YELLOW AND ABOUT 4 INCHES IN DIAMETER

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Pegmatite
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Host
    Rock type Plutonic Rock > Pegmatite

Nearby scientific data

(1) -103.70168, 43.7419
ListMap

Economic information

Ore body information

  • Strike N 5 E
    Dip E

Economic information about the deposit and operations

Development status Occurrence
Commodity type Both
Deposit size Small
Significant No

Mining district

District name Custer District

Land status

Ownership category National Forest
Area name Black Hills

Ownership information

  • Type Owner
    Owner Maywood Chemical Co. Of Maywood, Nj

Comments on the workings information

  • SEVERAL SHALLOW CUTS

Reference information

Bibliographic references

  • Deposit

    USGS PP 247, P. 141

  • Deposit

    USBM INFO CIRC 7707, P. 120

  • Deposit

    SDSMT BULL 18

General comments

Subject category Comment text
Deposit EXACT SHAPE AND DIP OF PEGMATITE HAVE NOT BEEN DETERMINED

Reporter information

Type Date Name Affiliation Comment
Reporter 01-NOV-1982 Barari, Rachel A. U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

External references

Maps centered on this site