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- Mica deposits of the Blue Ridge in North Carolina
Mica Mine in Avery county, North Carolina, this site also known as Race?
Penstock (Race?) mine
Principal periods worked |
WWI, WWII |
Workings |
Cut 100, adits |
Description of muscovite |
Green, tied, stained, bent, ruled |
Production |
Small sheet, feldspar. |
Shape |
Lenses |
Size |
20 T |
Strike |
NW |
Dip |
SW |
Relation to wallrock |
Concordant(?) |
Wallrock |
Mica gneiss |
Extent of weathering |
Unweathered |
Remarks |
P-Pl-Q-M pegmatite, coarse grained accessory allanite. |
Source of information |
USGS, CMC |
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 |