METALLIC MINERAL DEPOSITS OF NEW ENGLAND: HISTORICAL OVERVIEW, KNOWN DEPOSITS, AND POTENTIAL UNDISCOVERED RESOURCES
Important known metal deposits (all in ME) as yet unmined are: (1) Maple-Hovey Mountain, a 325 Mt sedimentary Mn-Fe deposit that represents the largest Mn resource in the U.S.; (2) Bald Mountain, a 30 Mt Cu-Zn-Ag-Au VMS deposit, and other smaller (~3-5 Mt) VMS deposits including Pickett Mountain (Mt. Chase), Ledge Ridge, and Alder Pond; (3) Warren, a gabbro-hosted Ni-Cu-Co deposit; (4) Catheart Mountain, a porphyry Cu-Mo deposit; and (5) Pembroke (Barrett-Big Hill), a group of epithermal Zn-Pb-Ag-Au deposits.
Mineral occurrences and geochemical anomalies, together with favorable geological settings, suggest that New England is prospective for a variety of undiscovered metal deposits. In addition to VMS deposits in ME, NH, VT, and MA, and porphyry Cu-Mo deposits in ME, potential exists for the following deposit types: (1) granite-related W skarns ± veins in eastern/northeastern VT, northern NH, and western ME; (2) sediment-hosted (Carlin-type) Au in western VT; (3) intrusion-related Au in central/western VT, and in southern/eastern ME; (4) REE-Nb-Ta in alkaline/peralkaline intrusions in central NH and western/southern ME; (5) U-Th or Sn in felsic plutons in central NH and ME; (6) Li-Cs-Ta-Be in pegmatites in western ME and NH; (7) sediment-hosted Zn-Pb-Ag in carbonate rocks in northern VT; (8) Ni-Cu-Co-PGE in mafic plutons in central/eastern ME; (9) PGE in ultramafic-hosted chromitite in western ME; and (10) epithermal Zn-Pb-Ag-Cu-Au in volcanic rocks in eastern ME.