Tusc Deposit

Eureka County, Nevada, United States

GoldSilverArsenicAntimonyBarium-BariteMercuryCopperLeadZinc

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Description

Newmont Exploration, Ltd.\n

Commodities

PrimaryGold, Silver

TertiaryArsenic, Antimony, Barium-Barite, Mercury, Copper, Lead, Zinc

Commodity typeB

Deposit

Deposit typedisseminated

Model173: Sediment-hosted Au

Deposit sizeN

WorkingsSurface

Orebody formtabular

Ore controlA system of several coalescing faults subparallel to and related to the Good Hope Fault is interpreted to be the conduit for gold-bearing hydrothermal fluids. A majority of ore is hosted by Roberts Mountains Formation and 15% of ore hosted by Rodeo Creek Unit.

Materials

Ore mineralsGold, Arsenopyrite, Cinnabar, Galena, Pyrite, Realgar, Stibnite

GangueKaolinite, Alunite, Sericite, Illite, Barite, Hematite, Calcite, Quartz

Geology

Host rockLimestone,Siltstone,Chert,Argillite · "Roberts Mountains Formation", "Popovich Formation", "Rodeo Creek Unit"

StructureThe Good Hope fault system which strikes N40W and dips steeply SW is a narrow reverse fault that strikes N45W and has highly variable dip. It connects Tusc to Gold Quarry. At Tusc, it juxtaposes Roberts Mountains Formation and the Rodeo Creek Unit., Anticlinal folding has warped host rocks in the mine area

AlterationArgillization, decalcification, silicification, and baritization are the dominant forms of alteration. Most of Tusc is weakly to moderately argillized. Intense argillization occurs in some fault zones. Decalcification is strong to moderate. Along most faults, silicification is intense and jasperoids are common. Baritization is of minor importance, occurring as thin discontinuous veins associated with areas of intense silicification.

Economic & production

Development statusProducer

Production years1994-2004

First production1994

Last production2004

Discovery year1985

Identification

Deposit ID10310323

MRDS IDRE00036

Alternate namespart of Newmont?s Carlin-South operations, MAC Deposit

RegionNA

Data scoreA

Coordinates40.8031, -116.23625

References

Schull, H.W., 1991, The Lithostratigraphy and Sedimentology of the Contact/Transition Between the Roberts Mountains Formation and the Western Facies Rocks in the Carlin Mining District, Eureka and Elko Counties, Nevada, in Raines, G.L., et al., eds., The Geology and Ore Deposits of the Great Basin, The Geological Society of Nevada, Reno, p. 705-712.Ekburg, C., Rota, J., and Arkell, B., 1991, Geology and Mineral Deposits of the Maggie Creek Subdistrict, Carlin Trend, Eureka County, Nevada, in Raines, G.L., et al., eds., The Geology and Ore Deposits of the Great Basin, The Geological Society of Nevada, Reno, p. 625-633.Rota, J., 1990, Geology and Mineral Deposits of the Maggie Creek Subdistrict, Carlin Trend, Eureka County, Nevada, Oral Presentation at Great Basin Symposium, The Geological Society of Nevada, Sparks, NV, April, 1990.Arkell, B., 1992, Geology of the Tusc and Mac Deposits, in Buffa, R. and Coyner, A., eds., Geology and Ore Deposits of the Great Basin-Field Trip Guidebook Compendium, The Geological Society of Nevada, Reno, p. 862-864.Mcfarlane, D., 1992, Gold Production on the Carlin Trend, in Buffa, R. and Coyner, A., eds., Geology and Ore Deposits of the Great Basin-Field Trip Guidebook Compendium, The Geological Society of Nevada, Reno, p. 841-843.NBMG, 1994, MI-1993Long, 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.John W. Norby and Michael J.T. Orobona, 2002, Geology and Mineral Systems of the Mike Deposit; in Gold Deposits of the Carlin Trend, NBMG Bull. 111.MINING JOURNAL, V308, # 7915, MAY 1, 1987, P332, INDUSTRY IN ACTION", "MORE GOLD FOR NEWMONT...".EKBURG, C. E., ROTA, J. C., AND B. W. ARKELL. GEOLOGY AND MINERAL DEPOSITS OF THE MAGGIE CREEK SUBDISTRICT, CARLIN TREND, EUREKA COUNTY, NEVADA: IN GEOLOGY AND ORE DEPOSITS OF THE GREAT BASIN PUBLISHED BY THE GEOLOGICAL SOCIETY OF NEVADA, 1991, PP. 625-633.U.S. BUR. LAND MANAGEMENT. NEWMONT GOLD COMPANY'S SOUTH OPERATIONS AREA PROJECT. DRAFT EIS, MAY 1993.WINTERS, R. A. MINES AND ORE BODIES IN THE CARLIN TREND, NEVADA--AN OVERVIEW OF THEIR EXPLORATION, DEVELOPMENT, PAST, PRESENT, AND FUTURE PRODUCTION, AND IMPORTANCE TO THE NEVADA ECONOMY: UNPUBLISHED REPORT TO THE ELKO DISTRICT, BUREAU OF LAND MANAGEMENT, ON FILE AT THE BUREAU OF MINES, WESTERN FIELD OPERATIONS CENTER, SPOKANE, WA.