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Langford Prospect

Past Producer in Custer county in South Dakota, United States with commodities Mica, Feldspar
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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. Ore body information
  12. Economic information about the deposit and operations
  13. Mining district
  14. Land status
  15. Ownership information
  16. Workings at the site
  17. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10104253
MRDS ID SD02286
Record type Site
Current site name Langford Prospect
Alternate or previous names Mohawk Mica

Geographic coordinates

Geographic coordinates: -103.51389, 43.75524 (WGS84)
Elevation 1658
Relative position ON TOP OF A RIDGE, 3.5 MI EAST 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 003S 005E 27 South Dakota

Comments on the location information

  • SW 1/4

Commodities

Commodity Importance
Mica Primary
Feldspar Tertiary

Materials information

Materials Type of material
Feldspar Ore
Mica Ore
Microcline Gangue
Plagioclase Gangue
Quartz Gangue

Alteration

  • (Local) Air Stained And Shows "A" Structure (Green Mica)

Host and associated rocks

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

Nearby scientific data

(1) -103.51389, 43.75524
ListMap

Economic information

Ore body information

  • Length 82.3M
    Width 3.05M

Comments on the geologic information

  • QUARTZ CRYSTAL MASSES AS LARGE AS 8 FEET IN DIAMETER (FIRST PEGMATITE)

Economic information about the deposit and operations

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

Mining district

District name Custer District

Land status

Ownership category National Forest
Area name Black Hills National Forest

Ownership information

  • Type Owner
    Owner L. L. Landis And Delbert Mckenna

Comments on the production information

  • THE 767 LBS OF CRUDE MICA YIELDED 36.6 LBS OF SMALL AND LARGE SHEET MICA.

Workings at the site

  • Type of workings Surface
    Overall length 15.24M
    Overall width 4.57M

Comments on the workings information

  • 10 FEET DEEP, IN THE DIKE-LIKE PEGMATITE.

Comments on development

  • ECON.COM: THE FIRST PEGMATITE CONTAINS RUBY MICA IN BOOKS 8 INCHES ACROSS. THE SECOND PEGMATITE CONTAINS GREEN MICA AS LONG AS 12 INCHES.

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 PEGMATITES; THE SECOND IS OVAL IN PLAN, 100 FEET LONG AND 50 FEET WIDE (GREEN MICA)

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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