Principal periods worked | 1950-60 |
---|---|
Workings | 8 cuts, 50-200 |
Description of muscovite | Green, "A" structure, bent, cracked, small |
Production | Small sheet, scrap, large feldspar. |
Shape | Lenses |
Size | Several 10-50 T, 100-300 L. |
Strike | NW |
Dip | Gentle NE |
Relation to wallrock | Partly concordant |
Wallrock | Interlayered biotite and hornblende gneiss |
Extent of weathering | Partly weathered. |
Remarks | P-Pl-Q-M pegmatite, fine to coarse grained, accessory biotite, garnet. |
Source of information | USGS |
WWI | World War I |
WWII | World War II |
int | intermittent |
Small | < 500 lb |
Moderate | 500-10,000 lb |
Large | > 10,000 lb |
D | depth |
L | length |
T | thickness |
avg | average |
B | biotite |
F | feldspar |
M | muscovite |
P | perthite |
Pl | plagioclase |
Q | quartz |
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 |