Mine detail: Middlemarch Mine

Previously called 'Missouri'

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Location

Lat / long:

31.87819, -109.94899

Resource(M)

Primary:	Copper, Zinc, Silver, Gold
Tertiary:	Lead, Molybdenum, Tungsten
Ore:	Chalcanthite, Chalcocite, Chalcopyrite, Covellite, Galena, Malachite, Pyrite, Pyrrhotite, Scheelite, Sphalerite
Gangue:	Andradite, Chlorite, Epidote, Grossularite, Quartz, Wollastonite
Orebody form:	CHIMNEY, IRREGULAR

Production

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

Geology

Host rock:	Bisbee Group
Host type:	Carbonate
Associated rock:	Stronghold Granite
Associated type:	Rhyolite
Structure:	Hinge Zone Of Nw Trending Fold, W Limb Cut Off By Sw Dipping Rever Se Fault (Red Ant) Which Juxta Poses Prec Cochise Peak Quartz Monzonit E Against Bisbee Group; Nw Trending Rhyolite Dike To Ne
Alteration processes:	Skarns-Marble; Epidote And Phlogopite-Chlorite Alteration At Fault S-More Intense Hear Faults

References

MRDS	M030567
DEP	10037134
Reference	{Deposit:: SOUSA, 1979, MS THESIS, UNIV OF ARIZ}{Deposit:: ADMR FILE DATA}{Deposit:: KEITH, 1973, ABM BULL 187}{Deposit:: MARVIN ET AL, 1973, USGS BULL 1379}{Deposit:: DAMON & BIKERMAN, 1964, AZ GEOL SOC DIGEST V.7, P. 63-78}{Production:: TENNEY, 1929, P.219}
Reporter	Peterson, Jocelyn A.