Tom Carpenter mine

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

Tom Carpenter (Old Hennessey) mine

Principal periods worked Pre-WWII
Workings 3, adits, 2 are 100 ft long and connected underground.
Description of muscovite Dark brown, moderate stain, bending, ruling.
Production Moderate sheet
Shape Irregular trough.
Size 20 T, >100 L
Strike NW
Dip NE., SW
Relation to wallrock Concordant
Wallrock Mica gneiss
Extent of weathering Unweathered
Remarks Pl-Q-P-M pegmatite; accessory, biotite-vermiculite (in strips 1-4 ft long, concentrated near footwall), allanite.
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