Westminster Terrane

Region East, Northeast
Mineral systems
Deposit types
Critical minerals
Other minerals

Information leading to the delineation of this focus area

Basis for focus area Extent of the Westminster Terrane in Maryland.
Identified resources Historical production of copper, gold, lead, silver and zinc.
Production None.
Status Past mining.
Estimated resources Unknown.
Geologic maps Southworth and others (2008), scale 1:100,000; Lyttle and others (2017), scale 1:100,000; Cloos and Cooke (1953), scale 1:62,500; Crowley and others (1976), scale 1:62,500; Edwards (1993), scale 1:62,500; Higgins and Conant (1990), scale 1:62,500; Jonas (1928), scale 1:62,500; Southwick and Owens (1968), scale 1:62,500; Froelich (1975), scale 1:62,500; Kuff (1981), scale 1:24,000.
Geophysical data Inadequate aeromagnetic and aeroradiometric coverage.
Favorable rocks and structures Metavolcanic units of the Westminster Terrane, Maryland (lumps, small bands, stringers, and veins typically in brecciated and crushed marble adjacent to contacts with metabasalt).
Deposits Roop mine (Zn, Cu) (MRDS dep_id: 10083916), Unionville (Zn, Cu) (MRDS dep_id: 10083915), Cox mines (Cu, Ag, Zn, Pb) (MRDS dep_id: 10121374), Mountain View mine (Cu, Au, Pb, Ag, Zn) (MRDS dep_id: 10194680).
Evidence from mineral occurrences MRDS.
Geochemical evidence Favorable mineralogy and rock type.
Geophysical evidence Unknown.
Evidence from other sources Unknown.
Cover thickness and description Variable.
Authors David K. Brezinski.
New data needs Geophysical data.
Geologic mapping and modeling needs Unknown.
Geophysical survey and modeling needs High resolution aeromagnetic and aeroradiometric coverage.
Digital elevation data needs Lidar complete in northern and southern parts of focus area; incomplete in central area.