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- Mica deposits of the Blue Ridge in North Carolina
"A" mine (on Little Elk Ridge)
Mica Mine in Avery county, North Carolina
"A" mine (on little Elk Ridge)
Principal periods worked |
WWII? |
Workings |
Adit 70, caved |
Description of muscovite |
Green, "A" structure, stained, bent |
Production |
Small sheet, scrap, feldspar. |
Shape |
Tabular |
Size |
12 T |
Strike |
NE |
Dip |
Gentle NW |
Relation to wallrock |
Concordant |
Wallrock |
Interlayered hornblende and biotite gneiss |
Extent of weathering |
Partly weathered. |
Remarks |
Pl-P-Q-M wall zone, medium to coarse grained; Q core. |
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 |