| Principal periods worked | Pre-WWII |
|---|---|
| Workings | Cut 225, 2 stopes |
| Description of muscovite | Green, wedge "A" structure, concentrated in core; Brown, biotite intergrowths, concentrated in wall zone. |
| Production | Moderate sheet, scrap, large feldspar. |
| Shape | Tabular |
| Size | 50 T, 225 L |
| Strike | NE |
| Dip | SE |
| Relation to wallrock | Concordant |
| Wallrock | Biotite gneiss |
| Remarks | Pl-P-Q-M wall zone, accessory biotite, vermiculite, garnet; P-Pl-Q-M core, coarse grained. |
| 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 |