Hasbrouck Mountain

Site Name

Primary: Hasbrouck Mountain
Secondary: Tonopah Hasbrouck Mine
Secondary: Kernick Vein
Secondary: McKane Vein
Secondary: Ore Car Adit
Secondary: part of Hasbrouck-Three Hills project

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Commodity

Primary: Silver
Secondary: Gold
Tertiary: Mercury
Tertiary: Antimony
Tertiary: Tungsten
Tertiary: Arsenic

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Location

State: Nevada
County: Esmeralda
District: (Gold Mountain District)

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Land Status

Land ownership: BLM Administrative Area
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.
Administrative Organization: Tonopah BLM Administrative District

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Holdings

Not available

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Workings

Not available

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Ownership

Owner Name: Vista Gold Corp.
Info Year: 2006

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Production

Not available

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Deposit

Record Type: Site
Operation Category: Producer
Deposit Type: epithermal, breccia vein
Operation Type: Underground
Year First Production: 1902
Year Last Production: 1923
Discovery Year: 1902
Years of Production:
Organization:
Significant: Y
Deposit Size: S

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Physiography

Not available

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Mineral Deposit Model

Model Name: Epithermal vein, Comstock

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Orebody

Form: tabular to blanket

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Structure

Type: L
Description: E-W and N-S-trending faults localized hot spring activity in the vicinity of the deposit.

Type: R
Description: Walker Lane structural zone. Basin and Range extensional faulting. Possibly on margin of buried caldera.

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Alterations

Alteration Type: L
Alteration Text: 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..

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Rocks

Name: Ash-Flow Tuff
Role: Host
Age Type: Host Rock
Age in Years: 17.000000+-
Age Young: Early Miocene

Name: Mixed Clastic/Volcanic Rock
Role: Host
Description: volcaniclastic
Age Type: Host Rock
Age in Years: 17.000000+-
Age Young: Early Miocene

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Analytical Data

Not available

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Materials

Ore: Electrum
Ore: Calcite
Ore: Albite
Ore: Adularia
Ore: Montmorillonite
Ore: Illite
Ore: Quartz
Ore: Stibnite
Ore: Chalcopyrite
Ore: Argentite
Ore: Pyrargyrite
Ore: Cerargyrite
Ore: Acanthite
Ore: Fluorite
Gangue: Pyrite

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Comments

Comment (Commodity): Ore Materials: electrum, acanthite, cerargyrite, pyrargyrite, argentite

Comment (Commodity): Gangue Materials: pyrite; minor chalcopyrite, , stibnite, quartz, illite, montmorillonite, adularia, albite, calcite, fluorite

Comment (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.

Comment (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.

Comment (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.

Comment (Identification): This record contain all data from record # M232041 plus additional updates.

Comment (Location): 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.

Comment (Workings): 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.

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References

Reference (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.

Reference (Deposit): USGS Professional Paper 1646

Reference (Deposit): Amer. Mines (1989-2001), 1989-2000

Reference (Deposit): NBMG, 1988, The Nevada Mineral Industry - 1987, NBMG Special Publication MI-1987-MI-1999.

Reference (Deposit): NBMG Mining District File 87, Numerous Press Clippings.

Reference (Deposit): Tonopah Times Bonanza, October 25, 1974, "Cordex Exploration Co. Probes Divide District."

Reference (Deposit): Weed, W.H., ed, 1920, The Mines Handbook, v. XIV, p. 1165.

Reference (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.

Reference (Deposit): NBMG Map 91 1st, 2nd, 3rdeditions

Reference (Deposit): Franco-Nevada Ann. Rep., 1997

Reference (Deposit): Goldfield Land Status, 1978

Reference (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.

Reference (Deposit): Bonham, 1989, Bulk-Mineable Precious-Metal Deposits and Prospects in Nevada, NBMG Map 91.

Reference (Deposit): NBMG Report 33, 1979, Papers on Mineral Deposits of Western North America, P. 124.

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

Reference (Deposit): Garside, L.J., and Tingley, J.V., 1982, Field Examination, NBMG, March 26, 1982.

Reference (Deposit): The Northern Miner, 1980.

Reference (Deposit): Lincoln, F.C., 1923

Reference (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.

Reference (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.

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Nevada Gold

Nevada has a total of 368 distinct gold districts. Of the of those, just 36 are major producers with production and/or reserves of over 1,000,000 ounces, 49 have production and/or reserves of over 100,000 ounces, with the rest having less than 100,000 ounces. Read more: Gold Districts of Nevada.