Plumtree mine

Mica Mine in Avery county, North Carolina

Plumtree mine

Principal periods worked 1870-81, 1906, 1925, WWII.
Workings Several connecting adits more than 300 long, small stopes.
Description of muscovite Greenish brown, "A" structure, stained, ruled, bent.
Production Moderate sheet, scrap.
Shape Tabular (?)
Size 4-10 T
Strike NW-NE
Dip Gentle NE-SE
Relation to wallrock Partly concordant
Wallrock Mica gneiss
Extent of weathering Weathered (15 ft?).
Remarks Pl-Q-M pegmatite, epidote veinlets cut pegmatite.
Source of information Sterrett (1923, p. 181), CMC, USGS.

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