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United States
Hollister Mine (Nevada Operation)

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 Location:
74 km NW from Elko, Nevada, United States

  Address:
6500 North Mineral Drive Suite 200
Coeur d’Alene
Idaho, United States
83815-9408
Phone  ...  Subscription required
Fax208-769-7612
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Overview

StatusInactive / Suspended
Mine TypeUnderground
Commodities
  • Gold
  • Silver
Mining Method
  • Cut & Fill
  • Longhole stoping
  • Cemented backfill
Production Start...
Mine Life3 years (as of Jan 1, 2017)
Hollister mine was acquired by Hecla Mining in July 2018. Since that time, mine's production and financial results have been included into the Nevada Operations Segment.

Production was suspended at the Hollister mine in the third quarter of 2019.


Owners

Source: p. 85,147
CompanyInterestOwnership
Hecla Mining Company 100 % Indirect
Klondex Hollister Mine Inc. (operator) 100 % Direct
Hecla Mining Company holds a 100% interest in Casa Berardi through its wholly-owned subsidiary Klondex Hollister Mine Inc.

Contractors

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Deposit Type

  • Vein / narrow vein
  • Epithermal


Summary:

Northern Nevada has a large number of very significant gold deposits. These are primarily related to the Carlin, Getchell, Battle Mountain – Cortez, and Northern Nevada Rift (NNR) trends. Two of these trends may be projected through or adjacent to the Mine area. The style of mineralization relating to these trends include the Epithermal Low Sulfidation mineralization along the NNR and the Carlin type mineralization.

In the Mine area, exploration and mining has been focused on three types of mineralization:
- Mercury in laterally extensive near-surface replacement silica zones and more localized sinter deposits, principally in the middle tuff unit;
- Disseminated gold in the middle and lower tuff units, andesite, and the Ordovician Vinini Formation beneath the hot spring mercury deposits; and
- Deeper high-grade gold-silver quartz-adularia veins and fracture zones in the Vinini Formation.

Hot spring-related silicification produced surface sinters, silicified bodies beneath the sinters, and widespread, generally bedding parallel, silicification in volcanic and sedimentary rocks. Cinnabar is the only ore mineral in these silica-rich deposits, and it is intergrown with chalcedony and opal (Wallace, 2003). All of the principal areas of known gold mineralization in the Mine area are associated with these silicified areas, occurring beneath them in underlying Tertiary or Paleozoic rocks at various depths below the principal silicified horizons. ........


Mining Methods

  • Cut & Fill
  • Longhole stoping
  • Cemented backfill


Summary:

Access to the mining areas will be from haulage drifts; up to 15 feet wide and between 15 feet to 17 feet high. Drift gradients vary from ±15% to reach the desired elevation.

Mining methods used are longhole stoping, cut and fill stoping, or shrink stoping. The final choice of mining method will depend upon the geometry of the stope block, proximity to main access ramps, ventilation and escape routes, the relative strength or weakness of the mineralized material and adjacent wall rock, and finally the value or grade of the mineralized material. The choice of mining method will not be made until after the stope delineation and definition drilling is completed.

Longhole stoping has the highest degree of mechanization of the three expected mining methods at the Mine and is the lowest cost method. This method requires the greatest amount of waste development and can be mined to a minimum width of three feet. The potential for unplanned wall dilution with this method is the greatest.

Stope development drifting is planned at nominal five feet wide and 10 feet high to accommodate the production drill and load haul dump (LHD) scoops. Levels are located at 38 foot vertical intervals to control dilution and may be increased as experience is gained in mining the Gloria veins. Stope widths are designed to a 3.5-feet minimum mining width or the vein width plus 1 foot of dilution.

To prepare an area for longhole stoping, access for the mobile ........


Crushing and Grinding


Processing

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Summary:

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Production:
Hollister mine was acquired by Hecla Mining in July 2018. Since that time, mine's production and financial results have been included into the Nevada Operations Segment.

CommodityUnits2017LOM (Projected)
Gold oz 6,751
Silver oz  ......  Subscription required
Gold Equivalent koz  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics2017
Ore tonnes mined 66,453 tons
Tonnes milled 28,870 tons

Reserves at December 31, 2022:
Hollister mineral resources, including the Hatter Graben are reported at a gold equivalent cut-off grade of 0.238 oz/ton. Metallurgical recoveries: 88% for gold and66% for silver.

CategoryTonnage CommodityGradeContained Metal
Measured 18 k tons Gold 0.59 oz/ton 10 koz
Measured 18 k tons Silver 4.9 oz/ton 87 koz
Indicated 70 k tons Gold 0.58 oz/ton 40 koz
Indicated 70 k tons Silver 1.9 oz/ton 130 koz
Measured & Indicated 88 k tons Gold 0.58 oz/ton 51 koz
Measured & Indicated 88 k tons Silver 2.5 oz/ton 217 koz
Inferred 642 k tons Gold 0.42 oz/ton 273 koz
Inferred 642 k tons Silver 3 oz/ton 1,916 koz

Commodity Production Costs:

CommodityUnits2017
Cash costs (sold) Gold Equivalent USD 2,386 / oz  

Financials:

Units2017
Capital expenditures M USD 6.7  
Revenue M USD 6.7  
Operating Income M USD -24.1  



Proposed Heavy Mobile Equipment as of May 31, 2017:
HME TypeSizeQuantity
Concrete sprayer ....................... Subscription required
....................... Subscription required ....................... Subscription required
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Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Feb 27, 2023
....................... Subscription required ....................... Subscription required Subscription required Feb 27, 2023
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required 2021
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required Subscription required Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2023
Press Release 2023
Form 10-K 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Form 10-K 2018
Press Release 2018
Press Release 2018
Form 10-K 2017
Pre-Feasibility Study Report 2017
Corporate Presentation 2016
Form 10-K 2016
Technical Report 2016
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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