| Basis for focus area |
Buffered points as prospects or mines. See MRDS dep_ids: 10218662 (Blue Hill Manganese mine), and 10306815 (Granger mine). |
| Identified resources |
Historical production of manganese. |
| Production |
Unknown. |
| Status |
Past mining. |
| Estimated resources |
Unknown. |
| Geologic maps |
Osberg and others (1985); scale 1:500,000. |
| Geophysical data |
Inadequate Rank 5 aeromagnetic and aeroradiometric coverage. |
| Favorable rocks and structures |
Ellsworth Formation and nearby Devonian plutons host the Blue Hill and Granger mines. Other prospects occur in the Vassalboro and Sangerville Formations. |
| Deposits |
Blue Hill manganese mine (MRDS dep_id: 10218662), Granger mine (MRDS dep_id: 10306815). |
| Evidence from mineral occurrences |
MRDS. |
| Geochemical evidence |
Unknown. |
| Geophysical evidence |
Unknown. |
| Evidence from other sources |
Unknown. |
| Cover thickness and description |
Variable limited cover and glacial cover estimated at less than 2-50 m. |
| Authors |
Gregory J. Walsh, Bernard E. Hubbard. |
| New data needs |
Geologic mapping at 1:24,000 scale. Airborne geophysics. Evaluate locations on lidar. |
| Geologic mapping and modeling needs |
1:24,000 scale mapping. |
| 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 adequate. |
