Lewiston area metasediments

Region East, Northeast
Mineral systems
Deposit types
Other minerals

Information leading to the delineation of this focus area

Basis for focus area High W concentrations in heavy-mineral concentrates from stream-sediment sampling (Nowlan and others, 1987; Nowlan and others, 1990).
Identified resources None.
Production None.
Status Unknown.
Estimated resources Unknown.
Geologic maps Hussey (1983), scale 1:62,500; Creasy (1979), scale 1:62:500; Pankiwskyj (1978a, b), scale 1:62,500.
Geophysical data Inadequate Rank 4 and 5 aeromagnetic and aeroradiometric coverage.
Favorable rocks and structures Limestone in early Paleozoic strata.
Deposits None.
Evidence from mineral occurrences Potential from mineral system/deposit type.
Geochemical evidence High tungsten in heavy-mineral concentrates from stream-sediment sampling (Nowlan and others, 1987, 1990).
Geophysical evidence Unknown.
Evidence from other sources Unknown.
Cover thickness and description Most of area is covered with glacial till. Outcrops are scarce.
Authors John F. Slack.
New data needs Detailed (1:24,000 scale) mapping, geochemistry, and geophysical surveys.
Geologic mapping and modeling needs 1:24,000 scale mapping to complete the area.
Geophysical survey and modeling needs High resolution aeromagnetic and aeroradiometric coverage.
Digital elevation data needs Lidar complete.