- Mineral Resources
- Online Spatial Data
- Mica deposits of the Blue Ridge in North Carolina
Black mine (near Senia Post Office)
Mica Mine in Avery county, North Carolina
Black mine (near Senia post office)
Principal periods worked |
Pre-WWII |
Workings |
Caved adit |
Description of muscovite |
Stained |
Shape |
Tabular |
Size |
5 T |
Strike |
NE |
Dip |
SE |
Relation to wallrock |
Concordant |
Wallrock |
Interlayered hornblende and biotite gneiss |
Remarks |
Pl-P-Q-M pegmatite; accessory biotite, apatite, allanite. |
Source of information |
USGS |
Abbreviations
Principal periods worked
WWI |
World War I |
WWII |
World War II |
int |
intermittent |
Production
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 |