Mine detail: Columbia Mine Group

Previously called 'TumacacoriSilent Friend'

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Location

Lat / long:

31.4032, -110.92596

Resource(M)

Primary:	Silver, Gold, Lead
Secondary:	Copper
Ore:	Anglesite, Chalcopyrite, Galena, Pyrite
Gangue:	Quartz
Orebody form:	TABULAR

Production

Operation type:	Unknown
Production size:	Small
Development status:	Producer
First production started:	1928
Last production ended:	1941

Geology

Host type:	Quartz Monzonite
Associated rock:	Quartz Monzonite Of Mount Benedict
Associated type:	Granite
Structure:	Numerous N-W Trending Aplite Dikes; Major Fault Trending N-S.
Alteration processes:	Minor

References

MRDS	M241356
DEP	10046342
Reference	{Deposit:: USBM-ABGMT PRODUCTION FILE DATA}{Deposit:: USBM FILE DATA-CLUSTER #30-COLUMBIA MINE GROUP}{Deposit:: ADMR FILE DATA-COLUMBIA (SILENT FRIEND) FILE}{Deposit:: USGS BULL 582, P. 352-353}{Deposit:: USGS MAP I-762}{Deposit:: ARIZ BUR MINES BULL 191, P.60}
Reporter	Laraba, Peter H (Calder, Susan)