| Workings | Cut 80, 2 adits |
|---|---|
| Description of muscovite | Brown, minor "A" structure, commonly cracked, tied, stained, bent. |
| Production | Small sheet |
| Shape | Lens |
| Size | 3 T |
| Strike | NW |
| Dip | SW |
| Wallrock | Interlayered hornblende and biotite gneiss |
| Extent of weathering | Partly weathered. |
| Remarks | Pl-Q-M pegmatite, medium to coarse grained; accessory sericite, tourmaline. |
| 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 |