| 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. |
