Mine detail: Midnight Mine

Previously called 'Keating Mine'

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Location

Lat / long:

33.07232, -109.30787

Resource(M)

Primary:	Copper, Gold
Secondary:	Lead, Silver
Tertiary:	Manganese
Ore:	Chalcopyrite, Galena, Lead, Sphalerite
Gangue:	Epidote, Garnet, Limonite
Orebody form:	FLAT TABULAR
Discovery year:	1903

Production

Operation type:	Unknown
Deposit type:	Replacement
Production size:	Small
Development status:	Producer
First production started:	1910
Last production ended:	1942

Geology

Host rock:	Modoc Limestone;Morenci Shale;Longfellow Limestone
Host type:	Limestone
Associated rock:	Morenci Granite Porphyry
Associated type:	Quartz Monzonite
Structure:	Ne Trending Faults; Intrusive Igneous Dikes Associated With Morenci Porphyry Stock, Porphyry Dikes Cutting Sedimentary Sequences
Tectonic:	Transition Between Basin And Range And Colorado Plateau Provinces
Alteration processes:	Deposit Is Replacement Of Interbedded Sandstone And Limestone Sequences

References

MRDS	M800405
DEP	10088899
Reference	{Deposit:: ABGMT-USBM FILE DATA}{Deposit:: ARIZONA DEPARTMENT OF MINERAL RESOURCES FILE DATA}{Deposit:: BLM DISTRICT SHEET 842}{Deposit:: ARIZ BUR MINES BULL 137, P. 187}{Deposit:: BENNETT, K.C., 1975, GEOLOGY AND ORIGIN OF THE BRECCIAS IN THE MORENCI-METCALF DISTRICT, GREENLEE COUNTY, ARIZONA: M.S. THESIS, UNIVERSITY OF ARIZONA, 153 P.}{Deposit:: ARIZ BUR MINES BULL 145, NO 12, P 75-77}
Reporter	Calder, Susan R.