Gorman tin district

Region West, Southwest
States
Mineral systems
Deposit types
Commodities
Critical minerals
Other minerals

Information leading to the delineation of this focus area

Basis for focus area Limestone of probable Paleozoic or Mesozoic age from the California state geologic map that hosts the Meeke mine and occurrences. Shown as PZm marble on 1:24,000-scale maps of the area. Skarn mineralization in marble pendants and stoped blocks within the Cretaceous Tejon Lookout Granite.
Identified resources Identified resources and historical production of tin.
Production Meeke mine produced 5 tons of hand-sorted ore containing 1.93 tons Sn in 1944.
Status Past mining.
Estimated resources District in situ ore reserve estimates in 1945: 3,740 short tons of 1.0 to 2.0% Sn; 3,450 tons of 0.5 to 1% Sn; and 25,600 tons of 0.1 to 0.3% Sn (Wiese and Page, 1945).
Geologic maps Olson and Swanson (2017), scale 1:24,000; Olson and Swanson (2019), scale 1:24,000.
Geophysical data Inadequate aeromagnetic and aeroradiometric coverage.
Favorable rocks and structures Skarn mineralization in marble pendants and stoped blocks with the Cretaceous Tejon Lookout Granite.
Deposits Meeke mine (Hogan-Mallery tin mine (MRDS dep_id: 10212342; USMIN Site ID: CA00067), Upper Butler (USMIN Site ID: CA00068), Crowbar Gulch (USMIN Site ID: CA00069).
Evidence from mineral occurrences MRDS; USMIN.
Geochemical evidence Cassiterite occurs with scheelite, powellite, pyrite, chalcopyrite, arsenopyrite, molybdenite, magnetite, epidote, tourmaline, ludwigite, amphibole, garnet, phlogopite, calcite, and quartz.
Geophysical evidence Unknown.
Evidence from other sources Magnetite tactite.
Comments Cassiterite in limonitic gossan at the Meeke mine. Drilled by the U.S. Bureau of Mines and sampled by USGS.
Cover thickness and description Exposed.
Authors 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.
Digital elevation data needs Lidar complete.