Hasbrouck Mountain

Esmeralda County, Nevada, United States

SilverGoldArsenicMercuryAntimonyTungsten

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Description

unknown, in early 1900s

Commodities

PrimarySilver

SecondaryGold

TertiaryArsenic, Mercury, Antimony, Tungsten

Commodity typeM

Deposit

Deposit typeepithermal, breccia vein

Model150: Epithermal vein, Comstock

Deposit sizeS

Orebody formtabular to blanket

Ore controlThe two known zones of early Au-Ag deposition as well as the thick sinter horizon on the east side of Hasbrouck Mountain are presumed to overlie the intersection of E-W and N-S-trending faults, of little displacement, which localized hot spring activity. Lapilli tuffs and volcaniclastic rocks acted as permeable aquifers allowing lateral flow of hydrothermal fluids. Electrum and acanthite deposition occurred 30-150 meters below the paleosurface as replacement and void space fillings. Boiling of hydrothermal fluid and microscale hydrothermal brecciation are probably associated with Au-Ag deposition. Intense near surface silicification led to self-sealing of the hydrothermal system, resulting in the explosive production of larger scale breccias, which localized later acanthite+electrum+pyrargyrite deposition (e.g. at the historic Tonopah Hasbrouck Mine).

Materials

Ore mineralsElectrum, Acanthite, Cerargyrite, Pyrargyrite, Argentite, Chalcopyrite, Stibnite, Quartz, Illite, Montmorillonite, Adularia, Albite, Calcite, Fluorite

GanguePyrite

Geology

Host rockMixed Clastic/Volcanic Rock,Ash-Flow Tuff · Siebert Formation

StructureE-W and N-S-trending faults localized hot spring activity in the vicinity of the deposit., Walker Lane structural zone. Basin and Range extensional faulting. Possibly on margin of buried caldera.

AlterationAlteration of the deposit is characterized by pervasive silicification and potassium metasomatism. Funnel shaped alteration envelopes surround the major hydrothermal conduits. The alteration envelopes progress inward from quartz + illite + montmorillonite to quartz + adularia +albite + illite to quartz + adularia + illite to quartz + adularia cores..

Economic & production

Development statusProducer

Production years1902-1923

First production1902

Last production1923

Discovery year1902

Identification

Deposit ID10310537

MRDS IDM232041

Alternate namesTonopah Hasbrouck Mine, Kernick Vein, McKane Vein, Ore Car Adit, part of Hasbrouck-Three Hills project

RegionNA

Data scoreB

Coordinates37.99133, -117.27009

References

Knopf, A., 1921, The Divide Silver District, Nevada, in Ransome, F.L., Gale, H.S., and Burchard, E.F., eds., Contributions to Economic Geology: USGS Bull. 715, p. 169-170.Graney, J.R., 1987, Hasbrouck Mountain, Nevada - Precious Metal Mineralization in a Fossil Hot Springs Environment, in Bulk Mineable Precious Metal Deposits of the Western United States - Guidebook for Field Trips, The Geological Society of Nevada, Reno.Ggraney, J.R., 1985, Geology, Alteration and Mineralization at Hasbrouck Mountain, Divide District, Esmeralda County, Nevada: Unpublished Ms Thesis, University of Nevada, Reno, 106 p.USGS Professional Paper 1646Lincoln, F.C., 1923NBMG Report 33, 1979, Papers on Mineral Deposits of Western North America, P. 124.Bonham and Garside, 1979, Geology of the Tonopah, Lone Mountain, Klondike, And Northern Mud Lake Quadrangles, Nevada, NBMG Bulletin 92, p. 121-128.Garside, L.J., and Tingley, J.V., 1982, Field Examination, NBMG, March 26, 1982.The Northern Miner, 1980.Tonopah Times Bonanza, October 25, 1974, "Cordex Exploration Co. Probes Divide District."Weed, W.H., ed, 1920, The Mines Handbook, v. XIV, p. 1165.Smith, Tingley, Bentz, et al, 1983, A Mineral Inventory of the Esmeralda-Stateline Resource Area, Las Vegas District, Nevada, NBMG Open File Report 83-11.Bonham, 1989, Bulk-Mineable Precious-Metal Deposits and Prospects in Nevada, NBMG Map 91.NBMG, 1988, The Nevada Mineral Industry - 1987, NBMG Special Publication MI-1987-MI-1999.NBMG Mining District File 87, Numerous Press Clippings.NBMG Map 91 1st, 2nd, 3rdeditionsFranco-Nevada Ann. Rep., 1997Goldfield Land Status, 1978Amer. Mines (1989-2001), 1989-2000Long, 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.