Lincoln Rock mine

Mica Mine in Avery county, North Carolina

Lincoln Rock mine

Principal periods worked 1925, WWII
Workings 7 cuts, stopes, adit, inclines, in the area 100 by 450.
Description of muscovite Reddish-brown, clear, biotite intergrowths.
Production Large sheet
Shape Lenses
Size >1-12 T, >110 L.
Strike NE
Dip SE
Plunge S
Relation to wallrock Concordant
Wallrock Interlayered hornblende and biotite gneiss
Remarks Pl-Q-M-B pegmatite, medium to coarse grained; accessory allanite, apatite, garnet.
Source of information USGS, OF

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