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Lake Mica Prospect

Past Producer in Custer county in South Dakota, United States with commodity Mica
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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. Workings at the site
  16. Links to other databases
  17. Bibliographic references
  18. General comments
  19. Reporter information

Geologic information

Identification information

Deposit ID 10055674
MRDS ID SD02285
Record type Site
Current site name Lake Mica Prospect
Alternate or previous names Lakeside

Geographic coordinates

Geographic coordinates: -103.55778, 43.84496 (WGS84)
Elevation 1902
Relative position JUST EAST OF SYLVAN LAKE, 6 MI NORTHEAST 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

Custer(quadrangle 1:24,000 scale)

Mount Rushmore(quadrangle 1:100,000 scale)

Hot Springs(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Middle Cheyenne-Spring(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 002S 005E 29 South Dakota

Comments on the location information

  • SW 1/4

Commodities

Commodity Importance
Mica Primary

Materials information

Materials Type of material
Biotite Ore
Muscovite Ore
Plagioclase Gangue
Quartz Gangue
Tourmaline Gangue

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Pegmatite
    Rock unit name Harney Peak Granite;Pegmatite
    Rock description Harney Peak Granite;Pegmatite
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Granite

Nearby scientific data

(1) -103.55778, 43.84496
ListMap

Economic information

Ore body information

  • General form DIKE
    Strike N 50 E
    Dip 80 NW
    Thickness 2.44M
    Length 45.72M

Economic information about the deposit and operations

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

Mining district

District name Unorganized District

Land status

Ownership category National Forest
Area name Black Hills National Forest

Ownership information

  • Type Operator
    Owner L. H. Jeffries
  • Type Owner
    Owner Mrs. Gladys Wells

Workings at the site

  • Type of workings Surface
    Overall length 15.24M
    Overall width 2.44M

Comments on the workings information

  • OPENCUTS AND PROSPECT PITS. MAIN CUT IS UP TO 40 FEET DEEP.

Comments on development

  • ECON.COM: SHEET MICA IS FOUND IN THE CORE

Reference information

Bibliographic references

  • Deposit

    U. S. BUREAU OF MINES, 1955, BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 2, BUREAU OF MINES INFORMATION CIRCULAR 7707

  • Production

    U.S. BUREAU OF MINES, 1955, BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 2, BUREAU OF MINES INFORMATION CIRCULAR 7707

General comments

Subject category Comment text
Deposit 2 ZONES; 3 DIKES, CENTRAL DIKE INFORMATION LISTED

Reporter information

Type Date Name Affiliation Comment
Reporter 01-AUG-1980 Barari, Rachel A. U.S. Geological Survey

Beyond USGS

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

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