Hawk mine

Mica Mine in Mitchell county, North Carolina

Hawk mine

Principal periods worked 1870-95, 1920, 1929-30, 1939-44, 1953-59.
Workings Cut 500 long, 125 deep, adit 600. Stopes, inclines, drifts above and to 200 below adit level.
Description of muscovite Light reddish brown, ruled, minor bending.
Production Large sheet scrap
Shape Lenses, pinch and swell.
Size 1-12 T
Strike NE
Dip SE
Plunge S
Relation to wallrock Concordant
Wallrock Interlayered hornblende and biotite gneiss; biotite alteration
Extent of weathering Saprolite (100 ft).
Remarks Pl-Q-P-M pegmatite, medium to coarse grained; accessory, biotite, spessartite, tourmaline, apatite, thulite, pyrite, pyrrhotite. Thicker lenses tend to have Pl-Q-M wall zone and P core.
Source of information USGS (Sterrett, 1923, p. 245) Olson (1944, p. 60-63, pls. 8-10.

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