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- Mica deposits of the Blue Ridge in North Carolina
Mica Mine in Avery county, North Carolina
Pine Flats Spar mine
Principal periods worked |
1959 |
Workings |
Cut 150 long, 50 deep |
Description of muscovite |
Green, "A" structure bent |
Production |
Small scrap, feldspar. |
Size |
50 T (?) |
Wallrock |
Mica gneiss |
Extent of weathering |
Partly weathered. |
Remarks |
P-Pl-Q-M-B pegmatite, coarse-grained; accessory garnet. |
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 |