Trinity Range-Kamma Mountains

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

Information leading to the delineation of this focus area

Basis for focus area Polymetallic (Cu-Ag-Au-Pb-Sn) vein and breccia deposits mostly in Oligocene rhyolite, a mined Ag(-Sn) deposit in Oligocene rhyolite, elevated Ag and Sn concentrations in rhyolite (presumably Oligocene) and cassiterite in Au placers. Tin production (cassiterite) from mines on Majuba Hill; placer cassiterite in Rosebud Canyon and Rabbit Hole, north and northwest of Majuba Hill; stannite in drill hole cuttings from the Trinity Silver mine; elevated Sn concentrations in altered rhyolites, Trinity Silver mine and Trinity Range south of Majuba Hill.
Identified resources Historical production of copper, lead, silver, tin, and zinc.
Production Majuba Hill area mines (1906-1951): total production as compiled was approximately 2.8 million lbs Cu, 184,000 oz Ag, 885,800 lbs Pb, 106,000 lbs Zn, and 21,000 lbs Sn (Stevens, 1971).
Status Past mining. The USBM and 6 exploration companies have drilled the Majuba Hills area.
Estimated resources Unknown.
Geologic maps MacKenzie and Bookstrom (1976), scale 1:3,600; Johnson (1977), scale 1:250,000.
Geophysical data Inadequate aeromagnetic and aeroradiometric coverage.
Favorable rocks and structures Shallow rhyolitic intrusive complex appears to be at a structural intersection between dike-filled north-northeast and west-northwest fault zones.
Deposits Majuba Hill mine (MRDS dep_id: 10042468), Trinity Silver mine (MRDS dep_id: 10042483), Esther mine (MRDS dep_id: 10042473), Rabbit Hole placers (MRDS dep_id: 10042453), Rosebud gold mine (MRDS dep_id: 10310434).
Evidence from mineral occurrences MRDS.
Geochemical evidence Geochemistry of the Majuba Hill intrusives reported anomalously high contents of U, Th, B, As, Bi, Au, Ag, and Li (Wenrich and others, 1984).
Geophysical evidence Unknown.
Evidence from other sources Morris (2017).
Comments First production at the Majuba Hill mine was for Cu and Sn.
Cover thickness and description Fairly well exposed, but potential for covered deposits on the pediment on both sides of the Trinity Range, especially the western side.
Authors John L. Muntean.
New data needs Mapping, petrography, biogeochemistry, geochronology, geophysics.
Geologic mapping and modeling needs Updated geologic mapping.
Geophysical survey and modeling needs High-resolution, Rank 1 aeromagnetic and aeroradiometric surveys.
Digital elevation data needs Lidar in progress (GeoDAWN).