Boonfield mine

Mica Mine in Avery county, North Carolina

Boonfield mine

Principal periods worked Pre-WWII
Workings Several shallow pits, caved adits.
Description of muscovite "A" structure, stained, mineral inclusions.
Production Small scrap
Wallrock Hornblende gneiss
Extent of weathering Weathered
Remarks Kaolinized F-Q-M pegmatite.
Source of information 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