Crab Orchard prospect

Mica Prospect in Avery county, North Carolina

Crab Orchard prospect

Principal periods worked 1955
Workings Shaft 30, drifts 50
Description of muscovite Green, clear, "A" structure, small
Production Small scrap
Shape Lenses
Size 0-2 T
Dip Flat
Relation to wallrock Concordant
Wallrock Biotite gneiss
Extent of weathering Unweathered
Remarks Pl-Q-M wall zone, medium to coarse grained; Q core.
Source of information DMEA

Geographic context


Principal periods worked
WWI World War I
WWII World War II
int intermittent
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