Franklin mine

Mica Mine in Avery county, North Carolina, this site also known as Iva Johnson, Callahan

Franklin (Iva Johnson, Callahan) mine

Principal periods worked WWI, WWII, 1954 (?).
Workings Cut 50, adit, stope 75
Description of muscovite Greenish brown, bent, stained, locky
Production Small sheet
Shape Tabular
Size 30 T
Strike NW
Dip SW
Relation to wallrock Concordant
Wallrock Interlayered biotite and hornblende schist
Extent of weathering Unweathered
Remarks P-Pl-Q-M pegmatite, fine to medium grained; accessory garnet, allanite, apatite, sericite.
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