Oregon Cyprus-type massive sulfide

Region West, Northwest
Mineral systems
Deposit types
Critical minerals
Other minerals

Information leading to the delineation of this focus area

Basis for focus area The focus area outlines submarine basalts and associated ultramafic rocks ranging in age from Permian through Jurassic in the Klamath Terrane in the Klamath Mountains of northern California and southern Oregon.
Identified resources Historical production of copper, gold, lead, silver, and zinc.
Production Turner-Albright: 3 Mt of massive sulfide ore averaging 1.46% Cu, 3.33% Zn, 15g/t Ag, and 3.7 g/t Au (Kuhns and Baitis, 1987); Grey Eagle: 2.24 Mt ore at 1.82% Cu, 2.4 g/t Au, 3.7 g/t Ag.
Status Past mining. The Grey Eagle mine has been reclaimed.
Estimated resources Unknown.
Geologic maps Smith and others (1982), scale 1:250,000.
Geophysical data Inadequate aeromagnetic and aeroradiometric coverage.
Favorable rocks and structures All Permian through Jurassic sedimentary and volcanic rocks as well as the eastern part of the Josephine peridotite complex were delineated as permissive for Cyprus-type deposits.
Deposits Turner-Albright (MRDS dep_id: 10100737), Grey Eagle (MRDS dep_id: 10225872), Queen of Bronze mine (MRDS dep_id: 10042804), Blue Ledge.
Evidence from mineral occurrences MRDS.
Geochemical evidence Unknown.
Geophysical evidence Unknown.
Evidence from other sources Unknown.
Comments USBM drilled and assayed the Blue Ledge mine in 1947. The USGS did a mineral resource assessment (mapping, geochemical and aeromagnetic surveys) for the Medford 1:250,000-scale quadrangle that cover the northern part of the focus area. (Singer and others, 1982, 1983).
Cover thickness and description Unknown.
Authors Allen K. Andersen, Deborah A. Briggs, Jane M. Hammarstrom.
New data needs None requested at this time.
Geologic mapping and modeling needs None requested at this time.
Geophysical survey and modeling needs None requested at this time.