Matilda Vance mine

Mica Mine in Avery county, North Carolina

Matilda Vance mine

Principal periods worked 1890, 1907-10, WWII, 1957.
Workings Numerous cuts, pits, shafts, adits in area 200 by 800.
Description of muscovite Green, rent, rules, stained
Production Moderate sheet
Strike NW
Dip NE
Relation to wallrock Partly discordant
Wallrock Hornblende gneiss
Extent of weathering Weathered
Remarks Kaolinized F-Q-M wall zone; Q core, discontinuous.
Source of information USGS, Sterrett (1923, p. 183)

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