White Rock (south) mine

Mica Mine in Avery county, North Carolina

White Rock (south mine

Principal periods worked 1957
Workings 2 cuts 20, adit 41
Description of muscovite Green, "A" structure
Production Small sheet
Shape Lens
Size 20-40 T, >200 L.
Strike NW
Dip NE
Relation to wallrock Partly discordant
Wallrock Interlayered hornblende and biotite gneiss
Extent of weathering Unweathered
Remarks Pl-P-Q-M pegmatite fine to coarse grained; Q fracture fillings. Most of lens is fine-grained, locally coarse grained near hanging wall.
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