Eli Rock mine

Mica Mine in Avery county, North Carolina

Eli Rock mine

Principal periods worked 1905, WWII
Workings Incline 85, cut
Description of muscovite Greenish brown, card, small, moderately cracked, bent, stained.
Production Small sheet
Shape Tabular
Size 10 T
Strike NE
Dip SE
Relation to wallrock Concordant
Wallrock Hornblende gneiss
Extent of weathering Unweathered
Remarks Pl-Q-P-M pegmatite, medium grained; accessory biotite, sericite.
Source of information USGS, CMC

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