Hollister gold Deposit

Site Name

Primary: Hollister gold Deposit
Secondary: Ivanhoe deposit
Secondary: USX Mine
Secondary: USX West
Secondary: USX East
Secondary: Butte #1
Secondary: Butte #2
Secondary: Clementine
Secondary: Velvet
Secondary: Rowena

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Commodity

Primary: Gold
Primary: Silver
Primary: Mercury
Tertiary: Copper
Tertiary: Zinc
Tertiary: Lead
Tertiary: Antimony

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Location

State: Nevada
County: Elko
District: Ivanhoe-Carlin trend

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Land Status

Land ownership: Private
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.

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Holdings

Not available

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Workings

Not available

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Ownership

Owner Name: Touchstone Resources, Ltd., (a wholly owned subsidiary of Cornucopia Resources.)
Home Office: Box 250, Battle Mountain, Nv 89820

Owner Name: Cornucopia Resources, Ltd.
Percent: 50.00

Owner Name: Galactic Resources, Ltd.
Percent: 50.00

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Production

Not available

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Deposit

Record Type: Site
Operation Category: Producer
Deposit Type: Hot-spring Au-Ag, fault zone
Operation Type: Surface-Underground
Year First Production: 1915
Discovery Year: 1915
Years of Production:
Organization:
Significant: Y
Deposit Size: M

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Physiography

Not available

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Mineral Deposit Model

Model Name: Hot-spring Au-Ag

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Orebody

Form: bedded

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Structure

Type: R
Description: The deposit occurs along the northern projection of the Carlin Trend, just south of the Midas Trough.

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Alterations

Alteration Type: L
Alteration Text: The deposit is affected by silicification, argillization, and propylitization. The ore is generally argillized beneath a barren near surface silica cap. The ore is also locally silicified. Tuffaceous rocks are altered to quartz, chalcedony, kaolinite, adularia, and alunite. The andesite is altered to montmorillonite, nontronite, and chlorite, and is crosscut by fractures which contain silica, pyrite, and adularia.

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Rocks

Name: Andesite
Role: Associated
Age Type: Associated Rock
Age in Years: 13.800000+-
Age Young: Middle Miocene

Name: Andesite
Role: Associated
Age Type: Associated Rock
Age in Years: 16.300000+-
Age Young: Early Miocene

Name: Tuff
Role: Associated
Age Type: Associated Rock
Age in Years: 13.800000+-
Age Young: Middle Miocene

Name: Tuff
Role: Associated
Age Type: Associated Rock
Age in Years: 16.300000+-
Age Young: Early Miocene

Name: Argillite
Role: Host
Age Type: Host Rock
Age Young: Ordovician

Name: Quartzite
Role: Host
Age Type: Host Rock
Age Young: Ordovician

Name: Andesite
Role: Host
Age Type: Host Rock
Age Young: Miocene

Name: Tuff
Role: Host
Age Type: Host Rock
Age Young: Miocene

Name: Mixed Clastic/Volcanic Rock
Role: Host
Description: sinter
Age Type: Host Rock
Age Young: Miocene

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Analytical Data

Analytical Data: As, Sb, Tl, Ba, Mn, Te, Cd, Co, Cu, Pb, Mo, Zn, Ni.
Analytical Data: In the sulfide zone, Au is associated with pyrite, marcasite, and trace amounts of chalcopyrite, cinnabar, stibnite, realgar, tetrahedrite-tennantite, and sphalerite. Arsenopyrite, covellite, galena, millerite, and pyrrhotite have also been tentatively identified. In the oxidized zone, Au is associated with goethite and limonite. Gold occurs as discrete native gold particles attached to or included in pyrite and marcasite or their oxidized equivalents. Gold is not encapsulated by silica.

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Materials

Ore: Gold
Ore: Chalcedony
Ore: Kaolinite
Ore: Adularia
Ore: Alunite
Ore: Montmorillonite
Ore: Nontronite
Ore: Chlorite
Ore: Calcite
Ore: Pyrite
Ore: Pyrite
Ore: Chalcedony
Ore: Kaolinite
Ore: Adularia
Ore: Alunite
Ore: Montmorillonite
Ore: Nontronite
Ore: Chlorite
Ore: Calcite
Gangue: Quartz

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Comments

Comment (Identification): This record supersedes MRDS record # W700379, which should be deleted, as this record contains all information in W700379 plus additional updates.

Comment (Location): The mine is located in the Little Antelope Creek area. UTM is to shaft of historic Clementine mercury mine, at the northeastern extremity of the Clementine bulk-mineable orebody.

Comment (Workings): Ore will be mined from four pits. These pits encompass several historic underground mercury mines, including Clementine, Velvet, Butte #1, and Butte #2 mines. Pits and heap leach operation will occupy at least 350 acres, including the mine waste dump, roads, crusher, plant, etc. Construction began during the fall of 1988, continuing for four years.

Comment (Commodity): Ore Materials: native gold grains. quartz, chalcedony, kaolinite, adularia, alunite, montmorillonite, nontronite, chlorite, calcite, sulfosalts, very fine-grained pyrite

Comment (Deposit): In the sulfide zone, gold is associated with pyrite, marcasite, and trace amounts of chalcopyrite, cinnabar, stibnite, realgar, tetrahedrite-tennantite, and sphalerite. Arsenopyrite, covellite, galena, millerite, and pyrrhotite have also been tentatively identified. In the oxidized zone, gold is associated with goethite and limonite. Gold occurs as discrete native gold particles attached to or included in pyrite and marcasite or their oxidized equivalents. Gold is not encapsulated by silica.

Comment (Economic Factors): Production from 1990 through 1995 for the Hollister deposit was 3.5 tonnes of gold and an unknown amount of silver from 2968 kilotonnes of ore. In 1995, the remaining resource in the Hollister deposit was estimated to be about 38,000 kilotonnes of ore containing 40.5 tonnes gold and an unknown amount of silver. In 2006, the resource at Hollister was reportedly 717,200 tons of material grading 1.295 ounces f gold per ton and 7.03 ounces of silver per ton.

Comment (Geology): The south boundary of known ore is controlled by an arcuate east-trending, near-vertical fault. Siliceous lake bed sinter occurs only north of this fault (probably a caldera margin fault). Alteration is best developed on N-S trending faults. Hg, As, Sb, and Tl all form geochemical haloes that extend above the gold deposit.

Comment (Development): The opalite at the mine site has been used for toolmaking by native Americans for some 8000 years. Prospecting of the surface mercury showings began at the turn of the century. Between 50 and 150 flasks of mercury were produced from 1915 to 1917. The district was idle from 1918 to 1929. From 1929 to 1943, 1032 flasks were produced from the Butte #1, Butte #2, and Clementine mines. Other mines in the district produced a total of less than 1000 flasks. Auric Metals drilled 100 shallow rotary holes around the Velvet Mine for mercury in 1969-70. APCO Oil drilled a porphyry molybdenum target during the 1970's. Noranda drilled a core hole in 1980 on a uranium target. Homestake explored for a McLaughlin-type gold deposit in 1979-80. Placer Amex drilled several rotary holes in 1982 for Au, Ag, and Hg. In 1984, Kennecott drilled 13 rotary holes for gold in the area. From 1980-86, United States Steel Corp. Completed detailed geologic mapping, rock chip and soil geochemical grids, and geophysical surveys over the Hollister deposit area. Anomalous surface rock chip assays at the extreme southwestern end of the deposit led to drill intercepts of ore grade gold in 1982. USSC completed 123,031 ft. of drilling (195 rotary and 33 core holes), then sought a JV partner or buyer for the property in 1986. Touchstone acquired the property in 1987 and a JV with Galactic was formed later that year. By the end of 1987, Touchstone had completed 240 holes for 127,950 ft. of drilling. A feasibility study was initiated in 1987. Continued drilling identified four mineralized zones that correspond closely with historic mercury mines. Mining commenced in 1990 and continued through 1995. In 2005, Great Basin Gold Ltd.(50%) announced that the access decline at the Ivanhoe Project has now intersected the Gweniver Vein system at a depth of roughly 2,720 feet from the portal.

Comment (Commodity): Gangue Materials: quartz, chalcedony, kaolinite, adularia, alunite, montmorillonite, nontronite, chlorite, calcite, sulfosalts, very fine-grained pyrite

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References

Reference (Deposit): NMBG, 1991, The Nevada Mineral Industry - 1990, NBMG Special Publication MI-1990.

Reference (Deposit): Hollister, V.F., 1986, unpublished report on the Ivanhoe District.Hollister, V., Hruska,D., Moore, R., 1992, A mine-exposed hot spring deposit and related epithermal gold resources, Economic Geology and the Bulletin of the Society of Economic Geologists, vol. 87,No. 2, Pages 421-424

Reference (Deposit): Putnam, Borden, 1990, Fall 1990 field trip guidebook; the Carlin and Cortez trends; comparisons and contrasts; Cortez, Gold Acres and Buckhorn vs Carlin, Post and Ivanhoe, Geological Society of Nevada. Special Publication No.12, 1990

Reference (Deposit): Tingley, J.V., and Bentz, J., 1983, NBMG Open File Report 83-10 (includes field reports for Ivanhoe District).

Reference (Deposit): Granger, et al., 1957, NBMG Bulletin 54.

Reference (Deposit): Bartlett, M.W., et al., 1991, Geology of the Hollister Gold Deposit, Ivanhoe District, Elko County, Nevada, in Raines, G.L., et al., eds., Geology and Ore Deposits of the Great Basin, the Geological Society of Nevada, Reno, p. 957-978.

Reference (Deposit): NBMG,1994, MI-1993.

Reference (Deposit): Long, K.R., DeYoung, J.H., Jr., and Ludington, S.D., 1998, Significant deposits of gold, silver, copper, lead, and zinc in the United States: U.S. Geological Survey Open-File Report 90-206A, 33 p.; 98-206B. one 3.5 inch diskette.

Reference (Deposit): Great Basin Gold Ltd.,Press Release: December 12, 2005.

Reference (Deposit): Bonham, 1989, Bulk-mineable Precious-Metal Deposits and Prospects in Nevada, NBMG Map M91.

Reference (Deposit): NBMG, 1987, The Nevada Mineral Industry - 1986, NMBG Special Publication MI-1986.

Reference (Deposit): Mining Magazine, March 1988, p. 166.

Reference (Deposit): Mining Magazine, January 1989, p. 44.

Reference (Deposit): Mining database, November 1991, Mining Journal/Montagu Mining Finance.

Reference (Deposit): ERT, an engineering company, 1988, Proposed Ivanhoe/USX Project Environmental Assessment Report.

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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.