| Lat / long: | 31.49458, -110.74874 |
| Primary: | Copper, Silver |
| Secondary: | Lead, Zinc, Gold |
| Tertiary: | Iron |
| Ore: | Bornite, Chalcocite, Chalcopyrite, Cuprite, Galena, Pyrite, Sphalerite, Tetrahedrite |
| Gangue: | Hematite |
| Orebody form: | IRREGULAR |
| Discovery year: | 1875 |
| Operation type: | Unknown |
| Production size: | Small |
| Development status: | Producer |
| Host type: | Rhyolite,Plutonic Rock |
| Associated rock: | Mt Wrightson Formation;Josephine Canyon Diorite |
| Associated type: | Diorite,Trachyandesite |
| Structure: | General Structure Common To Regional Formations Is A Sheeting Which Dips 40 Nnw, Main Vein Paralleled By Banded Iron Formation-Hematite Dike Showing Some Copper Stain, And By Several Smaller Parallel Quartz Veins; 5 Principal Veins On Property |
| Tectonic: | Alum Gulch Fault Block |
| Alteration processes: | Extensive Surface Oxidation |
| MRDS | M899932 |
| DEP | 10048345 |
| Reference | {Deposit:: USBM FILES, EXPOSED REEF MINES}{Deposit:: ADMR FILE DATA, EXPOSED REEF AND BLUE EAGLE GROUPS}{Deposit:: ABGMT FILES, STANTON B. KEITH}{Deposit:: SCHRADER, FRANK C., 1915, MINERAL DEPOSITS OF THE SANTA RITA AND PATAGONIA MOUNTAINS, ARIZONA; USGS BULLETIN 582, P.257-258}{Deposit:: SIMONS, FRANK S., 1974, GEOLOGIC MAP AND SECTIONS OF THE NOGALES AND LOCHIEL QUADRANGLES, SANTA CRUZ COUNTY, ARIZONA; USGS MAP I-762 (1:48000)}{Deposit:: SIMONS, FRANK S., 1972, MESOZOIC STRATIGRAPHY OF THE PATAGONIA MOUNTAINS AND ADJOINING AREAS, SANTA CRUZ COUNTY, ARIZONA; USGS PROFESSSIONAL PAPER 658-E}{Deposit:: ABGMT CLIPPINGS FILE, EXPOSED REEF MINE}{Deposit:: MOORES, RICHARD C., 1972, THE GEOLOGY AND ORE DEPOSITS OF A PORTION OF THE HARSHAW DISTRICT, SANTA CRUZ COUNTY, ARIZONA; M.S. THESIS, UNIVERSITY OF ARIZONA} |
| Reporter | Calder, Susan R. |