Mine detail: Niagra Mine

Previously called 'Key Group'

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Location

Lat / long:

34.19977, -112.84686

Resource(M)

Primary:	Gold, Silver
Secondary:	Copper
Ore:	Galena, Silver
Gangue:	Quartz
Orebody form:	LENSES
Discovery year:	1883

Production

Operation type:	Unknown
Deposit type:	Vein
Production size:	Small
Development status:	Past Producer
First production started:	1894
Last production ended:	1943

Geology

Host type:	Granite
Associated type:	Mafic Intrusive Rock,Andesite
Structure:	Granite Is Massive And Unfoliated, Veins Parallel Andesite Dikes Which Trend E-W To Ne And Dip At Low Angles, Less Than 40 Deg.
Alteration processes:	None

References

MRDS	M800366
DEP	10104151
Reference	{Deposit:: AZ. DEPT. MIN. RESOURCES FILE DATA (CONGRESS MINE)}{Deposit:: ABGMT CLIPPINGS FILE (NIAGRA, KEY)}{Deposit:: USBM-ABGMT FILE DATA}{Reserve-Resource:: NIEMUTH, 1987.}
Reporter	Roth, Frances A. (Dewitt, Ed), Orris, Greta J.