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Twiggs Mica Mine

Past Producer in Mitchell county in North Carolina, 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. Commodities
  6. Materials information
  7. Alteration
  8. Host and associated rocks
  9. Nearby scientific data
  10. Geologic structures
  11. Ore body information
  12. Economic information about the deposit and operations
  13. Mining district
  14. Workings at the site
  15. Links to other databases
  16. Bibliographic references
  17. Reporter information

Geologic information

Identification information

Deposit ID 10025173
MRDS ID K000848
Record type Site
Current site name Twiggs Mica Mine
Related records 10248948

Geographic coordinates

Geographic coordinates: -82.07095, 36.04259 (WGS84)

Site location context

Political divisions (FIPS codes)

Mitchell(county)

North Carolina(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Carvers Gap(quadrangle 1:24,000 scale)

Johnson City(quadrangle 1:100,000 scale)

Johnson City(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Nolichucky(hydrologic unit)

French Broad-Holston(hydrologic accounting unit)

Upper Tennessee(hydrologic subregion)

Tennessee(hydrologic region)

Federal lands

Pisgah National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Croatan National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

National Forests in North Carolina(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States North Carolina Mitchell

Comments on the location information

  • SEE PLATE 3, PROF. PAPER 577 FOR LOCATION

Commodities

Commodity Importance
Mica Primary

Comments on the commodity information

  • MUSCOVITE-GREENISH BROWN, HARD, BENT, CRACKED, STAINED

Materials information

Materials Type of material
Muscovite Ore
Biotite Gangue
Pyrite Gangue

Alteration

  • (Local) Unweathered

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss
    Stratigraphic age (youngest) Neoproterozoic

Nearby scientific data

(1) -82.07095, 36.04259
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Pegmatite Concordant With Wallrock Structure

Ore body information

  • General form TABULAR, PINCH & SWELL
    Strike NE
    Dip SE
    Plunge NE
    Thickness 0.91M
    Length 60.96M
    Depth to bottom 45.72M

Comments on the geologic information

  • PLAGIOCLASE, QUARTZ, MUSCOVITE PEGMATITE, FINE TO MEDIUM GRAINED

Economic information about the deposit and operations

Development status Past Producer
Commodity type Non-metallic
Significant No
Production years 1942, 1956-1958

Mining district

District name Spruce Pine District/Hawk-Bakersville Area

Comments on the production information

  • PRODUCTION 500-10000 LB

Workings at the site

  • Type of workings Underground
    Length 28.35M
    Overall depth 30.48M

Comments on the workings information

  • 4 ADITS, SHAFT 100 FT, STOPES, DRIFT 93 FT

Reference information

Reporter information

Type Date Name Affiliation Comment
Reporter 01-APR-1973 Fagan, James M. U.S. Geological Survey

Beyond USGS

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

Maps centered on this site