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Hoppey mine

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Mica Mine in Avery county, North Carolina

Hoppey mine

Principal periods worked Pre-WWII, 1954
Workings 3 adits
Description of muscovite Green to light ruby, commonly stained, moderately bent, small.
Shape Pinch and swell.
Size 3-5 T
Strike NE
Dip Gentle NW
Relation to wallrock Concordant
Wallrock Interlayered hornblende and biotite gneiss
Extent of weathering Unweathered
Remarks Pl-Q-P-M wall zone, medium grained; accessory garnet; Q core, discontinuous.
Source of information USGS

Geographic context

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Geologic map unit -81.974312607, 36.027619933
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