Pennsylvania fluvial placers

Region East, Northeast
Mineral systems
Deposit types
Other minerals

Information leading to the delineation of this focus area

Basis for focus area Belt encompassing geophysical and geochemical anomalies.
Identified resources None.
Production No known production.
Status Unknown.
Estimated resources Unknown.
Geologic maps Horton and others (2017), scale 1:500,000.
Geophysical data Inadequate Rank 4 aeromagnetic and Rank 5 aeroradiometric coverage.
Favorable rocks and structures Placer deposits sourced from granite/granitic gneiss.
Deposits None.
Evidence from mineral occurrences Potential from mineral system/deposit type.
Geochemical evidence Elevated REE.
Geophysical evidence Radiometric eTh highs over surrounding rock where data available.
Evidence from other sources Unknown.
Comments In similar geologic environment as past producers, although deposits may be smaller. Geophysical data (especially radiometric) are likely to be helpful but there is limited precedent for detailed geophysical surveys in this environment. Surface geologic mapping likely to be very helpful.
Cover thickness and description Limited to no cover.
Authors Anjana K. Shah, Bernard E. Hubbard.
New data needs Surficial geologic mapping, geochemistry.
Geologic mapping and modeling needs Surface mapping to assist locations of sand deposits and favorable source rocks.
Geophysical survey and modeling needs High resolution aeroradiometric data to assist locations of heavy mineral sand deposits.
Digital elevation data needs Lidar mostly complete except for Baltimore County (Maryland) where it is planned and funded.