Mine detail: Endless Chain Mine

Previously called 'Cunningham Tunnel'

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Location

Lat / long:

31.43403, -110.72678

Resource(M)

Primary:	Copper
Ore:	Chalcocite, Chalcopyrite, Pyrite, Tetrahedrite
Gangue:	Epidote
Orebody form:	ROUGHLY BANDED

Production

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

Geology

Host rock:	Bisbee Formation
Host type:	Quartzite,Conglomerate,Limestone
Associated type:	Rhyolite
Structure:	Rhyolite Forms Dikes And Intrusive Sheets In Limestone, Sedimentary Beds Strike Approximately N-S And Dip 65-70 W
Tectonic:	Ux Ranch Fault Block
Alteration processes:	Replacement Of Cretaceous Sediments By Secondary Copper Minerals

References

MRDS	M899933
DEP	10048346
Reference	{Deposit:: SCHRADER, FRANK C., 1915, MINERAL DEPOSITS OF THE SANTA RITA AND PATAGONIA MOUNTTAINS, ARIZONA; USGS BULLETIN 582, P. 307-308}{Deposit:: USBM FILES, ENDLESS CHAIN MINE}{Deposit:: KEITH, STANTON B., 1975, INDEX OF MINING PROPERTIES IN SANTA CRUZ COUNTY, ARIZONA; ARIZONA BUREAU OF MINES BULLETIN 191, P. 79}{Deposit:: ABGMT FILES, STANTON B, KEITH}{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)}
Reporter	Calder, Susan R.