Jake Ollis mine

Mica Mine in Avery county, North Carolina

Jake Ollis mine

Principal periods worked WWII
Workings 6 small cuts, 2, adits, 35 and 45.
Description of muscovite Greenish brown, color banding, tied, stained.
Production Small sheet, feldspar.
Shape Lens
Size 1-20 T
Strike NW
Dip NE
Relation to wallrock Discordant
Wallrock Mica gneiss
Extent of weathering Unweathered
Remarks P-Pl-Q-M walls zone, fine to coarse grained; accessory garnet, apatite; Q core.
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