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Upper Henson Creek mine

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Mica Mine in Mitchell county, North Carolina

Upper Henson Creek mine

Principal periods worked Pre-WWII
Workings 3 adits
Description of muscovite Brownish green, small, ruled, bent
Production Small sheet
Shape Tabular
Size 3 T, >100 L, >50 D
Strike NW
Dip NE
Relation to wallrock Concordant
Wallrock Hornblende gneiss
Remarks Pl-Q-M pegmatite; accessory biotite, vermiculite, garnet.
Source of information USGS

Geographic context

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Geologic map unit -82.064517555, 36.049316815
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