Washington County intrusive rocks

Region East, Northeast
Mineral systems
Deposit types
Other minerals

Information leading to the delineation of this focus area

Basis for focus area Intrusive rocks similar to productive intrusives related to the St. Stephen and Mt. Pleasant intrusives a few miles across the international border in New Brunswick.
Identified resources Historical production of molybdenum (1903 to 1906).
Production Unknown.
Status Past mining.
Estimated resources Unknown.
Geologic maps Ludman and Hill (1990), scale 1:62,500; Gates (1978b), scale 1:62,500.
Geophysical data Inadequate aeromagnetic and aeroradiometric coverage.
Favorable rocks and structures Medium- to fine-grained, gray to buff granite. Molybdenite occurs as small grains disseminated rather evenly through unaltered granite (Young, 1963).
Deposits Burke Hill molybdenite occurrence (MRDS dep_id: 10008394), Copper mine (a molybdenite occurrence).
Evidence from mineral occurrences MRDS.
Geochemical evidence Host Meddybemps Granite locally has relatively high contents of U, Th, and heavy REE (Ludman and Hill, 1990).
Geophysical evidence The Cooper grid was surveyed with self-potential equipment, with readings spaced at 25-foot intervals on all traverses. The area of most intensive sulfide mineralization was apparently outlined in the survey, but the potential variation was quite low, less than 100 millivolts (Young, 1963).
Evidence from other sources Unknown.
Comments This area is of interest for granite-related Sn.
Cover thickness and description Glacial till covers perhaps 90% of area.
Authors Fred M. Beck.
New data needs High resolution airborne mag and radiometric surveys to further define map units in the focus area.
Geologic mapping and modeling needs Sampling of mine and prospect dumps for Sn, Co, and REE.
Geophysical survey and modeling needs High resolution aeromagnetic and aeroradiometric coverage.
Digital elevation data needs Lidar complete.