Description
Tom Patton & Paul Schmidt
Commodities
PrimaryGold, Silver
Commodity typeM
Deposit
Deposit typeHot-spring Au-Ag
Model104: Hot-spring Au-Ag153: Epithermal vein, quartz adularia
Deposit sizeN
Orebody formdisseminated
Ore controlRegional extensional faulting provided the conduits for the hydrothermal fluids, but mineralization is pervasive.
Materials
Ore mineralsGold
GangueCalcite, Quartz, Chalcedony
Geology
Host rockRhyolite,Tuff,Mixed Clastic/Volcanic Rock,Argillite,Trachyandesite · "Tombstone Formation", "Palmetto Formation", "Red Mountain"
StructureMinor east-northeast trending faults with minimal displacements are mapped in the area., Midway lies east of the Walker Lane, a prominent zone of parallel and sub-parallel right lateral strike slip faults,a major structure that separates the Sierra Nevada batholith from the Basin and Range Province; regional extensional Basin and Range type faulting
AlterationRhyolite host rock is altered, silicified.\nNorthwest-trending, sub-vertical rhyolite porphyry dikes that intrude the Palmetto Formation and overlying Rye Patch Formation at Midway are pervasively propylitized with local sericitic and phyllic hydrothermal alteration . Small amounts of pyrite and chalcopyrite occur in the dike rock.
Economic & production
Development statusProducer
Discovery year1986
Identification
Deposit ID10310416
MRDS IDM231771
Alternate namesMidway Mine, Discovery zone, SP 121 and 63-77 zones, Thunder Mountain property (adjacent)
RegionNA
Data scoreB
Coordinates38.24494, -117.08313
References
Kleinhampl, F.J. And Ziony, J.I., 1994, Geology and Mineral Deposits of Northern Nye Co.,NBMG Bulletins 99A & 99B.Mining Record 3/12/97Long, K.R., DeYoung, J.H., Jr., and Ludington, S.D., 1998, Database of significant deposits of gold, silver, copper, lead, and zinc in the United States; Part A, Database description and analysis; part B, Digital database: U.S. Geological Survey Open-File Report 98-206, 33 p., one 3.5 inch diskette.NBMG MI-2002NBMG MI-97Amer. Mines (1998), 1997International Mining News, 12 Mar 1997Bonham and Garfield, 1979, p.31Geoffrey Goodall, 2003, Exploration Summary of the Midway Gold Prospect, Nye County, Nevada; Geological Society of Nevada Special Publication No. 37, Spring 2003 Field Trip Guidebook, Gold Deposits of the Goldfield, Midway and Thunder Mountain Areas.Seabridge Gold Inc.,press releases, 10/24/02, 12/23/02.