Banks mine

Mica Mine in Yancey county, North Carolina

Banks mine

Principal periods worked 1953-54
Workings Cut 100, shaft 35, drifts 115
Description of muscovite Ruby, bent, stained, rules, cracked, biotite intergrowths.
Production Small sheet
Shape Lens
Size 1-15 T
Strike NW
Dip NE
Relation to wallrock Concordant
Wallrock Biotite schist
Extent of weathering Weathered (40 ft).
Remarks Pl-Q-M-B wall zone, medium to coarse grained; Q core.
Source of information DMEA

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