| Basis for focus area |
The terrane that contains calc-alkaline Ordovician to Devonian alkaline plutonic rocks of northern Maine, northern New Hampshire and northern Vermont, also includes the Catheart Mountain, Sally Mountain, and Deboullie prospects, and is considered permissive for porphyry Cu deposits, especially the porphyry Cu-Mo subtype. |
| Identified resources |
Identified resources for rhenium. |
| Production |
Unknown. |
| Status |
Past exploration. The Catheart Mountain rhenium occurrence, near Lake Parlin, Maine, was drilled by Noranda in the late 1960s. |
| Estimated resources |
Ore mineralization was found at Catheart Mountain, but the size of the deposit is estimated to be small. |
| Geologic maps |
Albee and Boudette (1972), scale 1:62,500; Boucot and Heath (1969), scale 1:62,500. |
| Geophysical data |
Inadequate aeromagnetic and aeroradiometric data: Rank 3 (65%) and Rank 4 (35%) aeromagnetic data; Rank 5 aeroradiometric data. |
| Favorable rocks and structures |
The two most important rock types at Catheart Mountain are quartz monzonite and quartz-feldspar porphyry, both of which contain mineralization (Ayuso, 1987). |
| Deposits |
Catheart Mountain, Sally Mountain, Deboullie prospects. |
| Evidence from mineral occurrences |
Potential from mineral system/deposit type.; Noranda company data. |
| Geochemical evidence |
Favorable mineralogy and rock type. The most important economic base metal in the Catheart Mountain pluton is Cu, but the pluton also contains anomalously high values of Mo, W, and Sn. The maximum observed values for base metals accompanying Cu in the sulfide-rich rocks are 320 ppm Mo, 13 ppm Sn, 49 ppm W, and 560 ppm Zn (Ayuso, 1989). |
| Geophysical evidence |
Unknown. |
| Evidence from other sources |
Unknown. |
| Comments |
These activities are stimulating renewed interest in Maine’s undiscovered mineral potential. |
| Cover thickness and description |
Mostly thin glacial till with variable thickness and cover. |
| Authors |
Nora K. Foley. |
| New data needs |
Geologic mapping, geophysics. |
| Geologic mapping and modeling needs |
1:24,000 scale geologic mapping. |
| Geophysical survey and modeling needs |
High resolution aeromagnetic and aeroradiometric data can assist with framework geology such as structural features and contacts. |
| Digital elevation data needs |
Lidar complete. |
