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Dalmon Mica Mine

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. 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. Ownership information
  17. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10055800
MRDS ID SD02557
Record type Site
Current site name Dalmon Mica Mine

Geographic coordinates

Geographic coordinates: -103.59445, 43.77968 (WGS84)
Elevation 1658
Location accuracy 500(meters)
Relative position NORTH 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 004E 24 NW South Dakota

Commodities

Commodity Importance
Mica Primary

Comments on the commodity information

  • PALE TO DEEP RUBY MICA, MOST AIR STAINED

Materials information

Materials Type of material
Mica Ore
Plagioclase Gangue
Quartz Gangue

Alteration

  • (Local) Air Stained

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) -103.59445, 43.77968
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Outcrops As A Low Knoll

Ore body information

  • General form ELLIPTICAL
    Length 30.48M
    Width 22.86M

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

Ownership information

  • Type Operator
    Owner Mac Robbie, Beatty
    Home office Custer, SD

Comments on the production information

  • ITEM 1 AND 2: LARGE AND SMALL MICA

Workings at the site

  • Type of workings Surface
    Area 0.006HA
    Overall length 10.67M
    Overall width 6.1M

Comments on the workings information

  • SEVERAL SMALL OPEN CUTS, AN ADIT AND A GLORY HOLE

Reference information

Bibliographic references

  • Deposit

    USBM INFO CIRC 7707, P. 117.

  • Deposit

    USGS PP 247, P. 98.

General comments

Subject category Comment text
Deposit MICA IS FOUND AT CONTACT BETWEEN THE TOPMOST PEGMATITE UNIT AND AN UNDERLYING PLAGIOCLASE-QUARTZ-MUSCOVITE UNIT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-1983 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