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Twiggs Mica Mine

Past Producer in Mitchell county in North Carolina, United States with commodity Mica
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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)
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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
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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
    Thickness 0.91M
    Plunge NE
    Depth to bottom 45.72M
    Length 60.96M

Comments on the geologic information

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

Economic information

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

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS K000848

Bibliographic references

  • Deposit

    LESURE, F.G., 1968, MICA DEPOSITS OF THE BLUE RIDGE IN NORTH CAROLINA: U.S. GEOLOGICAL SURVEY PROF. PAPER 577, P. 48-4

  • Deposit

    1968 COMPILE LESURE, F. G

  • Production

    USGS PROF. PAPER 577

Reporter information

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