Mine detail: Gringo Mine

Previously called 'Francis GroupTemporal Group'

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Location

Lat / long:

31.5718, -110.7704

Resource(M)

Primary:	Gold
Secondary:	Lead, Copper, Silver
Tertiary:	Molybdenum, Zinc
Ore:	Gold, Silver, Wulfenite
Gangue:	Biotite, Calcite, Fluorite, Hornblende, Kaolin, Magnetite, Quartz
Discovery year:	1893

Production

Operation type:	Unknown
Production size:	Small
Development status:	Past Producer
First production started:	1907
Last production ended:	1937

Geology

Host type:	Andesite
Associated rock:	Middle Member Of Bathtub Formation (Andesite Flows);Gringo Gulch Volcanics , Dacite Porphyry
Associated type:	Dacite
Structure:	E-W Trending Quartz Fissure Veins; Andesite Is Cut By Steeply S-Dip Ping Sheeting Structures, Dipping About Parallel With Lode, Gold Is Uniformly Distributed In Vein But Generally Favors Footwal L And Is Only Rarely Found In Hanging Wall
Tectonic:	Mt Wrightson Fault Block
Alteration processes:	Deeply Oxidized; Epidotized; Propylitic Alteration

References

MRDS	M030418
DEP	10037110
Reference	{Deposit:: KEITH, 1975, ABM BULL 191}{Deposit:: SCHRADER, 1915, USGS BULL 582}{Deposit:: DREWES, 1971, USGS MAP I-614}{Deposit:: ABGMT FILE DATA, STANTON B. KEITH}{Deposit:: USBM FILES, GRINGO MINE GROUP}{Deposit:: ABGMT-USBM FILE DATA}{Deposit:: ABGMT CLIPPINGS FILES, GRINGO GROUP}{Deposit:: ADMR FILE DATA, GRINGO MINE}{Production:: KEITH, 1975, P. 89}
Reporter	Peterson, Jocelyn A.