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Pinson

Sediment-hosted gold deposit in Nevada, U.S.A.

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Geologic information

CountryU.S.A.
State or provinceNevada
Geographic location:41°8'7"N, 117°15'25"W
(-117.256944, 41.135278)
(click for info)
SubtypeCarlin
Deposit size
Length2.4km
Width0.7km
Thickness60m
Area1.3sq km
Deposit features
Beds or lenses
Dikes or sills
Fault zone
Ore breccia
Stocks or plutons
Deposit age geologicCretaceous and (or) Tertiary
Deposit clusterGetchell Trend
Geochemical indicatorsAu, Hg, As, Sb, Tl, W
Intrusive rockgranodiorite (Osgood Mtn. stock); dacite dikes
Intrusive rock age92, Ar-Ar; Eocene? Ma
Ore bearing unitOrdovician Camus Fm.
Ore bearing unit thickness180 m
Tectonic settingNorth-American craton rifted western margin, imbricate structure
Minerals
Gold-bearing minerals:
Ore minerals:
Gangue minerals:
Alteration
Associated depositssediment-hosted Au
Geologic map unit-117.256944444444, 41.1352777777778
Nearby scientific dataFind additional scientific data near this location

Economic information

Statusmining operations
Owner or operatorPinson Mining Co. (subsidiary of Barrick Gold Corp.) 70%; Atna Resources Ltd. 30%
Discovery date1945
Startup date1949; 1980
Gold particle size≤5
Operation types
Open pit
Underground
Crushing and milling
Heap leach
Production tonnage10.3tonnes
Production years1980–2001
Total tonnage39tonnes
Contained gold115 tonnes
Recovery Au68; 85%
Source of tonnage, gradeBriggs (2006); Nevada Bureau (2011)

Silver grade

SilverUnitsCriteria
0g/tAll ore in deposit

Gold grade

GoldReservesResourcesUnitsCriteria
2.3g/tProduced ore (grams per tonne)
1.32g/tOre amenable to open-pit mining
12.8g/tOre amenable to underground mining
2.96g/tAll ore in deposit

Gold cut-off grades

ReservesResourcesUnitsCriteria
0g/tOre amenable to open-pit mining
6.86g/tOre amenable to underground mining

Reserves and Resources

Mining methodEstimate typeTonnageCriteria
Open pitReserve242012, NI 43-101, measured+indicated+inferred
UndergroundResource4.72012, NI 43-101, measured+indicated+inferred

Reference information

Comments

UG development. Waste:ore=5:1. Strong contact metamorphism extends >600 m from the intrusive contact. Au grades are typically declined in metamorphosed rocks. Strong oxidation to 60 m depth. Au positively correlates with Hg.

References

Atna Resources Ltd., 2008, Underground drifting commences at Pinson mine, Nevada: News Release of March 3, 2008, 2 p., last accessed July 7, 2011, at http://atna.com/s/News.asp?ReportID=289402&_Type=News-Releases&_Title=Underground-Drifting-Commences-at-Pinson-Mine-Nevada.Atna Resources Ltd., 2011, Pinson—Nevada: Project News of July 1, 2011, 2 p., last accessed July 7, 2011, at http://www.atna.com/s/Pinson.asp.
Atna Resources, 2012, Atna’s Pinson project has open-pit potential: Northern Miner Press Release of February 20, 2012.
Briggs, D.F., 2006, Mining operations report, version 2005: Unpublished.
Foster, J.M., and Kretschmer, E.L., 1991, Geology of the Mag deposit, Pinson mine, Humboldt County, Nevada, in Raines, G.L., Lisle, R.E., Schafer, R.W., and Wilkinson, W.H., eds., Geology and ore deposits of the Great Basin, Symposium Proceedings: Reno, Geological Society of Nevada, p. 845–856.
Groff, J.A., Heizler, M.T., McIntosh, W.C., and Norman, D.I., 1997, 40Ar/39Ar dating and mineral paragenesis for Carlin-type gold deposits along the Getchell Trend, Nevada—Evidence for Cretaceous and Tertiary gold mineralization: Economic Geology, v. 92, p. 601–622.
McLachlan, C.D., Struhsacker, E.M., and Thompson, W.F., 2000, The gold deposits of Pinson Mining Company—A review of the geology and mining history through 1999, Humboldt County, Nevada, in Crafford, A.E.J., ed., Geology and ore deposits—The Great Basin and beyond; Geology and ore deposits of the Getchell region, Humboldt County, Nevada: Geological Society of Nevada Symposium 2000, Field Trip 9, p. 123–153.
Nevada Bureau of Mines and Geology, 2011, The Nevada mineral industry, 2010: Nevada Bureau of Mines and Geology Special Publication MI-2010, 151 p.