Chestnut Mountain mine

Mica Mine in Avery county, North Carolina

Chestnut Mountain mine

Principal periods worked 1957-58
Workings Cut 50 long, 40 deep;'s stope 20 long, 15 high
Description of muscovite Green, "A" structure, bent, stained
Shape Lens
Strike NW
Dip SW
Relation to wallrock Partly concordant
Wallrock Interlayed hornblende and biotite gneiss
Extent of weathering Weathered
Remarks P-Pl-Q-M pegmatite, coarse grained; accessory garnet. Other cuts in similar pegmatite to north.
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