| Basis for focus area |
Grafton pegmatite district (Palermo mine). See Cameron and others (1954) Bradley, McCauley and Stillings (2017), Meyers and Stewart (1956), and Gazdik and others (1988). |
| Identified resources |
Historical production of beryllium (beryl), feldspar, and mica. |
| Production |
Unknown. |
| Status |
Past mining. |
| Estimated resources |
Unknown. |
| Geologic maps |
Englund (1976), scale 1:62,500; Moke (1946), scale 1:62:500; Smith and others (1939), scale 1:62,500; Quinn (1941), scale 1:62,500; Lyons and others (1997), scale 1:250,000; Thompson (2008b), scale 1:24,000. |
| Geophysical data |
Inadequate Rank 4 aeromagnetic coverage and Rank 5 aeroradiometric coverage. |
| Favorable rocks and structures |
Pegmatites are near the contact between biotite gneiss and sillimanite-mica schist, principally in the schist (Olson, 1942). |
| Deposits |
Palermo 1 mine (MRDS dep_id: 10084534), Ruggles feldspar-mica mine (MRDS dep_id: 10223088). |
| Evidence from mineral occurrences |
MRDS. |
| Geochemical evidence |
Favorable mineralogy and rock type. |
| Geophysical evidence |
Unknown. |
| Evidence from other sources |
Unknown. |
| Cover thickness and description |
Exposed at the surface. |
| Authors |
Nora K. Foley, Dwight C. Bradley, Anjana K. Shah, Gregory J. Walsh, Bernard E. Hubbard. |
| New data needs |
Detailed geologic mapping. |
| Geologic mapping and modeling needs |
Detailed mapping of pegmatite bodies, geophysics may not be useful for pegmatites. |
| Geophysical survey and modeling needs |
High resolution aeromagnetic and aeroradiometric data to assist with framework geology such as structural features and contacts. |
| Digital elevation data needs |
Lidar complete. |
