Mine detail: Gem Mine

Previously called 'Gem and BostonCordova Mine'

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Location

Lat / long:

33.4248, -110.77875

Resource(M)

Primary:	Copper
Secondary:	Gold, Silver, Lead
Tertiary:	Manganese, Zinc
Ore:	Chalcopyrite, Lead
Gangue:	Hematite, Quartz
Orebody form:	LINEAR

Production

Operation type:	Unknown
Production size:	Small
Development status:	Past Producer
First production started:	1908
Last production ended:	1947

Geology

Host rock:	Troy Quartzite
Host type:	Quartzite
Associated rock:	Granite Prophyry, Schultze Granite, Found In Small Amounts On Dump
Associated type:	Diabase
Structure:	Ne Trending Faults And Paleozoic Sediments, Later Diabase Intrusions, Diabase Outcrops Nw Of A Ne Trending Fault, Troy Quartzite Se Of Fault. Shaft Is In Troy Quartzite, Most Ore Is In Underlying Diabase

References

MRDS	M241221
DEP	10046315
Reference	{Deposit:: USGS PP 342, P. 104}{Deposit:: ABGMT CLIPPINGS FILES}{Deposit:: ABGMT-USBM FILE DATA}{Deposit:: ADMR FILE DATA}{Deposit:: WEED,W.H.,THE MINES HANDBOOK, VOL. XIV, 1920, P. 212}
Reporter	Roth, Frances A. (Gest, Don E.)