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Mica Mine in Avery county, North Carolina

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Principal periods worked Pre-WWII, WWII
Workings 5 cuts for 215 along strike, Incline 60 at southeast end.
Description of muscovite Brown, biotite intergrowths, stained
Production Small sheet
Shape Tabular
Size 1-8 T
Strike NW
Dip SW
Relation to wallrock Partly concordant
Wallrock Interlayered hornblende and biotite gneiss
Remarks Pl-Q-M walls zone; accessory biotite, vermiculite; P-Pl-Q core.
Source of information USGS

Geographic context


Principal periods worked
WWI World War I
WWII World War II
int intermittent
Small < 500 lb
Moderate 500-10,000 lb
Large > 10,000 lb
Size of pegmatite
D depth
L length
T thickness
avg average
Internal structure
B biotite
F feldspar
M muscovite
P perthite
Pl plagioclase
Q quartz
Source information
CMC Colonial Mica Corporation
DMEA Defense Minerals Exploration Administration
OME Office of Minerals Exploration
USGS U.S. Geological Survey
OF USGS open-file reports and maps