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Hasbrouck Mountain

Producer in Esmeralda county in Nevada, United States with commodities Silver, Gold, Arsenic, Mercury, Antimony, Tungsten
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Alteration
  9. Mineral occurrence model information
  10. Host and associated rocks
  11. Nearby scientific data
  12. Geologic structures
  13. Ore body information
  14. Controls for ore emplacement
  15. Economic information about the deposit and operations
  16. Mining district
  17. Land status
  18. Ownership information
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10310537
MRDS ID M232041
Record type Site
Current site name Hasbrouck Mountain
Alternate or previous names Tonopah Hasbrouck Mine, Kernick Vein, McKane Vein, Ore Car Adit, part of Hasbrouck-Three Hills project
Related records 10044553

Comments on the site identification

  • This record contain all data from record # M232041 plus additional updates.

Geographic coordinates

Geographic coordinates: -117.27009, 37.99133 (WGS84)
Elevation 1740
Relative position The property is located 6.5 miles SW of Tonopah, NV on U.S. Highway 95.

Site location context

Political divisions (FIPS codes)

Esmeralda(county)

Nevada(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Klondike(quadrangle 1:24,000 scale)

Goldfield(quadrangle 1:100,000 scale)

Goldfield(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Ralston-Stone Cabin Valleys(hydrologic unit)

Central Nevada Desert Basins(hydrologic accounting unit)

Central Nevada Desert Basins(hydrologic subregion)

Great Basin(hydrologic region)

Geographic areas

Country State County
United States Nevada Esmeralda

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 002N 042E 28 33 Nevada

Comments on the location information

  • The property is located on Hasbrouck Mountain, 6.5 miles SW of Tonopah, NV. UTM is to the shaft of the historic Tonopah Hasbrouck Mine.

Commodities

Commodity Importance
Silver Primary
Gold Secondary
Arsenic Critical Tertiary
Mercury Tertiary
Antimony Critical Tertiary
Tungsten Critical Tertiary

Comments on the commodity information

  • Ore Materials: electrum, acanthite, cerargyrite, pyrargyrite, argentite
  • Gangue Materials: pyrite; minor chalcopyrite, , stibnite, quartz, illite, montmorillonite, adularia, albite, calcite, fluorite

Materials information

Materials Type of material
Electrum Ore
Acanthite Ore
Cerargyrite Ore
Pyrargyrite Ore
Argentite Ore
Chalcopyrite Ore
Stibnite Ore
Quartz Ore
Illite Ore
Montmorillonite Ore
Adularia Ore
Albite Ore
Calcite Ore
Fluorite Ore
Pyrite Gangue

Alteration

  • (Local) Alteration 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..

Mineral occurrence model information

Model code 150
USGS model code 25c
Deposit model name Epithermal vein, Comstock
Mark3 model number 16

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Mixed Clastic/Volcanic Rock
    Rock type qualifier volcaniclastic
    Rock unit name Siebert Formation
    Stratigraphic age (youngest) Early Miocene
    Chronological age 17
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Pyroclastic Rock > Tuff > Ash-Flow Tuff
    Rock unit name Siebert Formation
    Stratigraphic age (youngest) Early Miocene
    Chronological age 17

Nearby scientific data

(1) -117.27009, 37.99133
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description E-W and N-S-trending faults localized hot spring activity in the vicinity of the deposit.
Type of structure Regional
Structure description Walker Lane structural zone. Basin and Range extensional faulting. Possibly on margin of buried caldera.

Ore body information

  • General form tabular to blanket

Controls for ore emplacement

  • The 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).

Economic information about the deposit and operations

Operation type Underground
Development status Producer
Commodity type Metallic
Deposit size Small
Significant Yes
Discovery year 1902
Discoverer unknown, in early 1900s
Year of first production 1902
Year of last production 1923
Production years 1902-1923

Mining district

District name Divide District
District name (Gold Mountain District)

Land status

Ownership category BLM Administrative Area
Area name Tonopah BLM Administrative District
Ownership category Private

Ownership information

  • Type Owner-Operator
    Owner Vista Gold Corp.
    Year 2006

Comments on the workings information

  • An adit cuts the vein at 500 ft. from portal and continues 700 ft. beyond, where it intersected disseminated mineralization in rhyolite tuff. There is a 230 ft. shaft with crosscut at 200 ft. level, and crosscuts S and NE from the bottom, as well as a 200 ft. shaft sunk about 1904, and deepened to 400 ft. in 1919. The more recently discovered disseminated deposit remained undeveloped as of 1992.

Comments on other economic factors

  • Production in 1923-1924 was 740 tons of ore valued at $10,406.
    Reserves of the disseminated deposit in 1997 were reported as 7.7 million tons of ore grading 0.036 ounces of gold per ton and 0.7 ounces of silver per ton .
    Vista Gold (2006) reported the following drill-indicated resources for Hasbrouck Mountain, based on an assessment by Mine Development Associates: 20,300,000 tons grading 0.023 ounces of gold per ton for 459,000 contained ounces.
    At Hasbrouck there is an additional inferred resource of 8,160,000 tons grading 0.021 ounces of gold per ton for 172,000 contained ounces.

Comments on development

  • Minor silver was produced from the hydrothermal breccias at the Tonopah Hasbrouck mine in the early 1900s. The deposit was owned by the Tonopah Hasbrouck Mining Co. in 1923. During the 1970s potential open-pit bulk tonnage targets were recognized at Hasbrouck and Gold Mountains. Disseminated gold-silver mineralization was discovered on Hasbrouck Mountain in the middle 1970s by Cordex Exploration Co. Cordex outlined the bulk of the Hasbrouck resource by 1975, but was unsuccessful in acquiring the adjoining Tonopah Divide property. Franco-Nevada acquired the property in the mid-1980s, drilled, and completed feasibility studies on the deposit.
    In 1992 Corona Gold briefly controlled Hasbrouck Mountain, Tonopah Divide and Hill of Gold, but their drill program was cut short by Corona's merger with Homestake Mining following the 1992 acquisition of the Eskay Creek property. Hasbrouck was assigned briefly to Prime Resources, and then reverted in 1993 to underlier Euro-Nevada Corp, which discovered the high grade Ken Snyder Mine at Midas soon thereafter. In 1996 Euro-Nv returned to drill 18 holes on outlying targets some of which had previously been recommended by Dr. Ken Snyder. The best, although low grade, results were reported from Eliza Jane patent adjoining the Tonopah Divide's Little Zoe claims on the north. The Hasbrouck property was owned by Franco-Nevada Mining Corp., Ltd. (2001) and by Vista Gold Corp. (2004-2006). Vista also controls the Three Hills property a few miles north in the Tonopah District and reports on the two together as their ?Hasbrouck-Three Hills? project although the two deposits are separate and distinct and a few miles apart.

Reference information

Bibliographic references

  • Deposit

    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.

  • Deposit

    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.

  • Deposit

    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.

  • Deposit

    USGS Professional Paper 1646

  • Deposit

    Lincoln, F.C., 1923

  • Deposit

    NBMG Report 33, 1979, Papers on Mineral Deposits of Western North America, P. 124.

  • Deposit

    Bonham and Garside, 1979, Geology of the Tonopah, Lone Mountain, Klondike, And Northern Mud Lake Quadrangles, Nevada, NBMG Bulletin 92, p. 121-128.

  • Deposit

    Garside, L.J., and Tingley, J.V., 1982, Field Examination, NBMG, March 26, 1982.

  • Deposit

    The Northern Miner, 1980.

  • Deposit

    Tonopah Times Bonanza, October 25, 1974, "Cordex Exploration Co. Probes Divide District."

  • Deposit

    Weed, W.H., ed, 1920, The Mines Handbook, v. XIV, p. 1165.

  • Deposit

    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.

  • Deposit

    Bonham, 1989, Bulk-Mineable Precious-Metal Deposits and Prospects in Nevada, NBMG Map 91.

  • Deposit

    NBMG, 1988, The Nevada Mineral Industry - 1987, NBMG Special Publication MI-1987-MI-1999.

  • Deposit

    NBMG Mining District File 87, Numerous Press Clippings.

  • Deposit

    NBMG Map 91 1st, 2nd, 3rdeditions

  • Deposit

    Franco-Nevada Ann. Rep., 1997

  • Deposit

    Goldfield Land Status, 1978

  • Deposit

    Amer. Mines (1989-2001), 1989-2000

  • Deposit

    Long, 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.

General comments

Subject category Comment text
Deposit Two periods of precious metal deposition have resulted in two different but related deposit types. A horizontal, tabular, and potentially bulk mineable Au-Ag deposit type was discovered by Cordex in the 1970s. Superimposed on this deposit type are slightly younger hydrothermal breccias which were mined in the early 1900's. These breccias are narrow, steeply dipping zones.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-2002 LaPointe, D.D. Nevada Bureau of Mines and Geology
Editor 01-SEP-2007 Schruben, Paul G. U.S. Geological Survey Converted from S&A FileMaker format to Oracle. Edit checks on rocks, units, and ages with Geolex search, and other fields.

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Nevada resources

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