Hughes mine

Mica Mine in Avery county, North Carolina, this site also known as A. A. Johnson

Hughes (A. A. Johnson) mine

Principal periods worked 1915, 1927, WWII
Workings Cut 50, with adit 115 and branching drifts 60 and 35. Other caved cuts, shafts and adits.
Description of muscovite Green, biotite intergrowths, stained, small.
Production Small sheet (WWII).
Shape Lenses
Size 4-6 T
Strike NE
Dip NW
Relation to wallrock Concordant
Wallrock Hornblende gneiss
Extent of weathering Weathered
Remarks P-Pl-Q-M pegmatite, medium grained; accessory biotite; numerous gneiss inclusions in pegmatite.
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