- Mineral Resources
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- Mica deposits of the Blue Ridge in North Carolina
Mica Prospect in Avery county, North Carolina
Chestnut prospect
Principal periods worked |
1959 |
Workings |
3 cuts 100-150 long, 10-20 deep. |
Description of muscovite |
Green, bent |
Shape |
Lenses |
Size |
1-3 T, 1-20 L |
Strike |
NW |
Dip |
SW |
Relation to wallrock |
Concordant |
Wallrock |
Interlayed hornblende and biotite gneiss |
Extent of weathering |
Weathered |
Remarks |
Pl-P-Q-M pegmatite, coarse grained; accessory biotite. |
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 |