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United States
Nevada Operation (Fire Creek Mine, Hollister Mine, Midas Mine)

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 Location:
84 km SW from Elko, Nevada, United States

  Address:
6500 North Mineral Drive Suite 200
Coeur d’Alene
Idaho, United States
83815-9408
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Fax208-769-7612
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  • Overview
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  • Geology
  • Mining
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  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StatusCare and Maintenance
Mine TypeUnderground
Commodities
  • Gold
  • Silver
Mining Method
  • Cut & Fill
  • Drift & Fill
  • Back stoping
  • Longhole stoping
  • Cemented backfill
The Nevada Operations consist of Midas mine and mill, Fire Creek mine, Hollister mine, and Aurora mine and mill.

During 2019, a decision was made to suspend the Nevada Operations activities. Production was suspended at the Hollister mine, at the Midas mine and Aurora mill in late 2019. Development ceased at Fire Creek in the second quarter of 2019 when the decision was made to limit near-term production to areas of the mine where development was already completed. Mining of non-refractory ore at Fire Creek in areas where development had already been performed was completed in the fourth quarter of 2020. During 2021, production and revenue was generated from processing of the stockpiled non-refractory ore at the Midas mill and third-party processing of refractory ore in a roaster and autoclave facility, respectively. Fire Creek was placed on care-and-maintenance in the second quarter of 2021 after processing of the remaining non-refractory ore stockpile.


Owners

Source: p. 9,85,147
CompanyInterestOwnership
Hecla Mining Company 100 % Indirect
Nevada Operations is 100% owned and was acquired on July 20, 2018 with the purchase of all of the issued and outstanding common shares of Klondex. Nevada Operations consists of three land packages in northern Nevada and containing operating or previously-operating mines with a history of high-grade gold production: Fire Creek, Hollister and Midas.

Contractors

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Deposit Type

  • Epithermal
  • Vein / narrow vein


Summary:

Mineralization at Fire Creek occurs in steeply dipping epithermal veins within Tertiary basalt flows and intrusive rocks. The mineralized basaltic rocks are a suite of mafic, extrusive rocks associated with the regional north-northwest-trending Northern Nevada Rift ("NNR") structural zone.

The deposit is a low-sulfidation epithermal deposit vertically-zoned within high-angle northwest striking structures, hosted in a mid-Miocene basalt package. Mineralization occurs as shallow structurally-controlled fault hosted gold mineralization in variably altered Tertiary basalts and as native gold in steeply dipping quartz-calcite veins or structures. A package of middle Miocene basalt and basaltic andesite flow has been cut by high-angle normal faults related to both NNR and Basin and Range extension that form grabens and half-grabens which are the structural controls in the district.

High-grade mineralization has been delineated between approximately 4,900 feet and 5,700 feet and is open both up and down dip as well as along strike. Lower-grade mineralization occurs from the surface and mineralization is open at depth. Vein textures, gangue minerals, and alteration seen at Fire Creek are typical of low-sulfidation epithermal systems. Widespread propylitic alteration changes to argillic alteration proximal to veins and/or other structural fluid conduits. Low-grade gold mineralization is often spatially associated with the argillic alteration zone surroundin ........


Mining Methods

  • Cut & Fill
  • Drift & Fill
  • Back stoping
  • Longhole stoping
  • Cemented backfill


Summary:

The Fire Creek mine is a trackless mine accessed by a decline, and has historically produced approximately 350 tons of ore per day. The mining method is primarily longhole stoping, with ramp access utilized.

Mining methods include several different techniques such as end slice stoping with delayed backfill, also referred to as longhole stoping, and drift and fill stoping.

Cemented rock fill (CRF), which consists of screened mine waste, fly ash, and cement is mixed on the surface and transported underground in the same trucks used to haul blasted rock to the surface.

Hollister includes an underground mine, former open pit mines, related mine support infrastructure, mining equipment, and administrative buildings, all of which are in operating condition.

The Hollister mine is a trackless mine accessed by a decline. Due to variability within the Hollister mine material, a selective mining approach is employed by matching mining methodology to stope characteristics. Hollister mining methods include cut and fill, ramp access and longhole stoping. The current Hollister mine plan primarily employs cut and fill stoping.

The Midas mine is a modern, mechanized narrow vein mine. The veins at Midas can vary in thickness from a few inches to over ten feet. Production at the Midas mine was suspended in the fourth quarter of 2019.


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Production:
The production and financial results of the Nevada Operations Segment are reported since the acquisition of Klondex on July 20, 2018.

CommodityUnits2021202020192018
Gold oz  ......  Subscription required  ......  Subscription required  ......  Subscription required32,887
Silver oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré.
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Operational Metrics:

Metrics2021202020192018
Tonnes milled  ......  Subscription required  ......  Subscription required210,397 tons116,383 tons
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Reserves at December 31, 2022:

CategoryTonnage CommodityContained Metal
Measured 20 k tons Gold 11 koz
Measured 20 k tons Silver 101 koz
Indicated 258 k tons Gold 682 koz
Indicated 258 k tons Silver 131 koz
Measured & Indicated 278 k tons Gold 143 koz
Measured & Indicated 278 k tons Silver 783 koz
Inferred 77,223 k tons Gold 3,458 koz
Inferred 77,223 k tons Silver 15,265 koz

Commodity Production Costs:

CommodityUnits2021202020192018
Credits (by-product) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required -76.38 / oz  
Cash costs Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,297 / oz  
Cash costs Gold USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1,221 / oz†  
All-in sustaining costs (AISC) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 2,027 / oz  
All-in sustaining costs (AISC) Gold USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1,950 / oz†  
† Net of By-Product.
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Operating Costs:

Units2021202020192018
UG mining costs ($/ton milled) USD 170.85216.8
Processing costs ($/ton milled) USD  ......  Subscription required  ......  Subscription required
Total operating costs ($/ton milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
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Financials:

Units2021202020192018
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 35.7  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required -26.7  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required -15.8  
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Heavy Mobile Equipment:

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 required Subscription required Mar 6, 2023
....................... Subscription required ....................... Subscription required Subscription required Feb 27, 2023
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2020
Subscription required 2019
Subscription required 2018

Corporate Filings & Presentations:

DocumentYear
Form 10-K 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
Form 10-K 2018
Technical Report 2018
Pre-Feasibility Study Report 2015
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