Emmons Knob mine

Mica Mine in Avery county, North Carolina

Emmons Knob mine

Principal periods worked WWI, WWII, 1950's(?).
Workings Cut 200, adits, drifts
Description of muscovite Greenish brown, flat and wedge "A" structure, moderate bending, cracking,
Production Small sheet
Shape Lenses; irregular bodies.
Size 1-7 T, 80 L
Strike NE
Dip Gentle SE
Relation to wallrock Partly concordant
Wallrock Interlayered hornblende and biotite gneiss
Extent of weathering Weathered (15 ft).
Remarks PL-Q-M wall zone, fine to medium grained; accessory garnet, epidote, thulite, sericite; Q core. Q-M pegmatite (burr rock) present locally
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