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Green Springs

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

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Geologic information

CountryU.S.A.
State or provinceNevada
Geographic location:39°8'25"N, 115°33'10"W
(-115.552778, 39.140278)
(click for info)
SubtypeCarlin
Deposit size
Length4km
Width0.3km
Thickness35m
Area0.9sq km
Deposit features
Beds or lenses
Ore breccia
Deposit age geologicCretaceous?
Deposit clusterBattle Mountain–Eureka Trend
Geochemical indicatorsAu, As, Sb, Hg, Tl
Ore bearing unitMississippian Joana Limestone and Chainman Shale, lower unit
Ore bearing unit thickness135 m
Tectonic settingNorth-American craton rifted western margin, foreland basin related to Antler orogeny
Minerals
Gold-bearing minerals:
Ore minerals:
Gangue minerals:
Alteration
Geologic map unit-115.552777777778, 39.1402777777778
Nearby scientific dataFind additional scientific data near this location

Economic information

Statusexploration
Owner or operatorInvenio Resources Corp. 75%
Discovery date1986
Startup date1988
Operation types
Open pit
Crushing and milling
Heap leach
Production tonnage1.1tonnes
Production years1988–1990
Total tonnage1.1tonnes
Contained gold2.3 tonnes
Recovery Au80%
Source of tonnage, gradeNevada Department (1990, 1991); Wilson and others (1989, 1991)

Silver grade

SilverUnitsCriteria
0.26g/tProduced ore (grams per tonne)
0.26g/tAll ore in deposit

Gold grade

GoldReservesResourcesUnitsCriteria
2.1g/tProduced ore (grams per tonne)
2.06g/tOre amenable to open-pit mining
2.1g/tAll ore in deposit

Gold cut-off grades

ReservesResourcesUnitsCriteria
0.7g/tOre amenable to open-pit mining

Reserves and Resources

Mining methodEstimate typeTonnageCriteria
Open pitReserve1.131987, historic

Reference information

Comments

Waste:ore=2.7:1 (Wilson and others, 1991). According to Nevada Department (1990, 1991), 9,000 oz Ag (0.279 t Ag) recovered in 1989–1990. 80% gold recovery probably indicates gold extraction in the heap-leach process.

References

Hose, R.K., Blake, M., Jr., and Smith, R.M., 1976, Geology and mineral resources of White Pine County, Nevada: Nevada Bureau of Mines and Geology Bulletin 85, 105 p.
Infomine, 2011, Invenio exercises option to acquire 75% of Kings Canyon and Green Springs projects: Press Release of April 5, 2011, 2 p., last accessed June 09, 2011, at http://www.infomine.com/index/pr/PB023819.PDF.Nevada Department of Minerals, 1990, Major mines of Nevada: Annual Summary 1989, 29 p., last accessed June 9, 2011, at http://minerals.state.nv.us/forms/mining/MajorMinesOfNevada/mm1989.pdf.Nevada Department of Minerals, 1991, Major mines of Nevada: Annual Summary 1990, 29 p., last accessed June 9, 2011, at http://minerals.state.nv.us/forms/mining/MajorMinesOfNevada/mm1989.pdf.
Wilson, W.R., Cox, J.W., and Lance, D.L., 1989, Geology and geochemistry of the Green Springs mine, in Schafer, B., and Buffa, R., eds., Geology and mineral deposits of White Pine County, Nevada: Reno, Geological Society of Nevada 1989 Spring Field Trip Guidebook, Special Publication 8, p. B17–B22.
Wilson, W.R., Cox, J.W., and Lance, D.L., 1991, Geology and geochemistry of the Green Springs gold mine, White Pine 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: Reno, Geological Society of Nevada Symposium Proceedings, p. 687–700.