Description
Gold Fields Mining Corp.
Commodities
PrimaryGold, Silver
SecondarySand and Gravel, Construction
TertiaryArsenic, Antimony, Lead, Thallium, Mercury
Commodity typeB
Deposit
Model172: Carbonate-hosted Au-Ag
Deposit sizeM
Orebody formCOMPLEX
Ore controlAlteration And Mineralization Were Channeled Into The Thick Bedded Lower Member Of The Etchart Limestone Along High Angle Fault Feeder Zones. Gold Deposition Is Spatially And Temporally Associated With Carbonate Dissolution And Bedding-Conformable Silicification. 90% Of Ore Is Hosted By Etchart Limestone, 10% By Underlying Goughs Canyon Basalt. The Highest Au-Ag Grades Are Coincident With The Most Severe Carbonate Dissolution Zones In The Etchart Limestone.
Materials
GangueAlbite, Augite, Barite, Calcite, Chlorite, Epidote, Fluorite, Kaolinite, Limonite, Pyrite, Quartz, Sericite, Tourmaline
Geology
Host rockSiltstone · Etchart Limestone;Etchart Limestone;Etchart Limestone;Etchart Limestone;Goughs Canyon Basalt
StructureRoberts Mountains Thrust (Below) And Golconda Thrust (Above), Intruded By Mid-Cretaceous Osgood Mt. Granodiorite And Related Trachyandesite Dikes., Chimney Creek Mine Occurs Along A Northeasterly Range Front Lineament That Is Likely An Extension Of The Getchell Fault, The Dominant Structural Feature Of The Getchell, Pinson, And Preble Deposits.
Tectonic settingNevadan And Basin And Range Block Faulting
AlterationArgillization, Carbonate Dissolution, Silicification, Sericite-Pyrite Argillic To Propylitic Alteration. See Geology Comments.
Economic & production
Development statusProducer
Production years1987 - PRESENT (2/92)
First production1987
Discovery year1985
Identification
Deposit ID10037801
MRDS IDM042791
Alternate namesChimney Prospect
RegionNA
Data scoreA
Coordinates41.27961, -117.15763
References
NEVADA MINING ASSOCIATION BULLETIN, OCTOBER - NOVEMBER, 1985THE MINING RECORD, NOVEMBER 13, 1985, P. 3RENO GAZETTE JOURNAL, NOVEMBER 11, 1985THE NORTHERN MINER NEWSPAPER, NOVEMBER 11, 1985MINE SEARCH ANNUAL, 1984-85, METALS ECONOMICS GROUP, BOULDER, CO, V. VII, P. 93-94ORAL COMMUNICATION FROM JIM DELONG, JULY 16, 1986, GEOLOGIST FORMERLY WITH GOLD FIELDSOSTERBERG, M.W., ET AL, 1991, GEOLOGY, WALL-ROCK ALTERATION AND NEW EXPLORATION TECHNIQUES AT THE CHIMNEY CREEK SEDIMENT-HOSTED GOLD DEPOSIT, HUMBOLDT COUNTY, NEVADA, IN RAINES, G.L., ET AL, EDS., GEOLOGY AND ORE DEPOSITS OF THE GREAT BASIN, THE GEOLOGICAL SOCIETY OF NEVADA, RENO, P. 805-819MINING DATABASE, MINING JOURNAL/MONTAGU MINING FINANCE, NOVEMBER 1991NEVADA BUREAU OF MINES AND GEOLOGY, 1991, THE NEVADA MINERAL INDUSTRY - 1990, NEVADA BUREAU OF MINES AND GEOLOGY SPECIAL PUBLICATION MI-1990STAFF, 1988, DIRECTORY OF NEVADA MINE OPERATIONS ACTIVE DURING CALENDAR YEAR 1987: NEVADA DIVISION OF MINE INSPECTION, 84 P.NBMG, 1994, MI-1993MINING DATABASE, MINING JOURNAL/MONTAGU MINING FINANCE, NOVEMBER, 1991. MI-1993NEVADA MINING ASSOCIATION BULL., OCT-NOV., 1985. MINING DATABASE, MINING JOURNAL/MONTAGU MINING FINANCE, NOVEMBER 1991. NBMG SPEC. PUB. MI-1990. MI-1993