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Doublehead mine (NW)

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Mica Mine in Avery county, North Carolina, this site also known as Cantrell workings

Doublehead mine (NW) Cantrell workings

Principal periods worked 1870, 1890's, 1920's, WWII
Workings 4 cuts, adits, inclines, shaft
Description of muscovite Brown, hard, clear, cracked, biotite intergrowths.
Production Small sheet; feldspar
Shape Irregular tabular.
Size 15 T, 350 L (?)
Strike NE
Dip SE
Relation to wallrock Partly concordant
Wallrock Mica gneiss
Extent of weathering Probably weathered.
Remarks Pl-P-Q-M pegmatite, medium to coarse grained, some graphic texture; accessory garnet, biotite, vermiculite, allanite?
Source of information USGS, Sterrett (1923, p. 179).

Geographic context

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Geologic map unit -82.018746347, 36.033367335
Nearby scientific data Find additional scientific data near this location

Abbreviations

Principal periods worked
WWI World War I
WWII World War II
int intermittent
Production
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