Friday Mine

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

Information leading to the delineation of this focus area

Basis for focus area Friday copper-nickel mine, nearby gold and tellurium mines and prospects in MRDS.
Identified resources Identified resources for copper and nickel.
Production Unknown.
Status Past mining and exploration.
Estimated resources Richest part of the deposits contains ~5,000 tons of ore with 2.5% Ni and 0.75% Cu; estimated Inferred reserve of 100,000 tons averaging 1.5% Ni and 0.75% Cu (Creasey, 1946).
Geologic maps Todd (2015), scale 1:24,000; Rogers (1965), scale 1:250,000.
Geophysical data Rank 3 and 4 aeromagnetic coverage; Rank 5 aeroradiometric coverage.
Favorable rocks and structures Friday mine is massive sulfide deposit hosted in San Marcos gabbro.
Deposits Friday mine (MRDS dep_id: 10067592).
Evidence from mineral occurrences MRDS.
Geochemical evidence Unknown.
Geophysical evidence Unknown.
Evidence from other sources Creasey (1946).
Comments Sulfides occur as disseminations and in small massive bodies and have been identified as pyrrhotite, pentlandite, violarite, pyrite, and chalcopyrite. Pyrrhotite is the most abundant mineral and occurs as large crystals poikilitically enclosing the other minerals (Cornwall, 1966).
Cover thickness and description Exposed at the surface, mineralization to some depth.
Authors Erica Key.
New data needs Updated geologic mapping, lidar, geochemistry, aeromagnetic and aeroradiometric surveys.
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 inadequate.