Bug Rock mine

Mica Mine in Avery county, North Carolina, this site also known as Westphalen

Bug Rock (Westphalen) mine

Principal periods worked 1929
Workings Cut 80
Description of muscovite Ruby, common biotite intergrowths
Production Moderate sheet
Size 15-30 T
Strike N
Wallrock Mica gneiss
Remarks Pl-Q-P-M-B pegmatite, medium to coarse grained; accessory vermiculite. Similar pegmatite worked in cut to northwest.
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