Mine detail: Exposed Reef Mines

Previously called 'Blue Eagle and Exposed Reef GroupSaint Louis Mine'

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Location

Lat / long:

31.49458, -110.74874

Resource(M)

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

Production

Operation type:	Unknown
Production size:	Small
Development status:	Producer

Geology

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

References

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.