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United States
Kensington Mine

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 Location:
70 km NW from Juneau, Alaska, United States

  Address:
3031 Clinton Dr., Ste. 202
Juneau
Alaska, United States
99801
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  • Overview
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  • Geology
  • Mining
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  • Fleet
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  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Drift & Fill
  • Longhole stoping
  • Transverse stoping
  • Longitudinal stoping
  • Cemented backfill
  • Paste backfill
Production Start...
Mine Life4 years (as of Jan 1, 2022)
The Kensington mine is an underground gold operation located in southeast Alaska, consisting of the Kensington Main deposit, Raven deposit, Jualin deposit, as well as other nearby deposits and exploration targets.


Owners

Source: p. 26
CompanyInterestOwnership
Coeur Mining, Inc. 100 % Indirect
Coeur Alaska, Inc. (operator) 100 % Direct
Coeur owns 100% of Coeur Alaska, Inc. ("Coeur Alaska"), which operates the Kensington mine, an underground gold mine located north of Juneau, Alaska.

Contractors

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Deposit Type

  • Vein / narrow vein
  • Mesothermal
  • Orogenic


Summary:

The deposits that comprise the Kensington Operations are considered to be examples of mesothermal vein-style, or orogenic-style gold deposits.

Mineralization of economic importance is restricted to veins within the Jualin Diorite. Minor goldanomalous quartz veins have been reported in Wrangellia Terrane metabasalt and in the metasedimentary rocks of the Treadwell Formation.

Discrete Veins
Discrete veins are hosted in shear zones that typically trend to the north or northwest, and are steeply easterly or northeasterly dipping. East dipping fault-fill veins are the dominant structures in the Kensington deposit. The quartz–pyrite–carbonate–sericite ± chlorite veins were developed along the plane of the shear zones, but also underwent continued deformation after emplacement. Gold hosting shear zones have a northeast side up (reverse)–right lateral shear sense, typical of other shear zones in the deposit area. If this shear sense is coeval with vein formation, it may provide predictable potential ore shoot control. Evidence from previously-mined (e.g., Raven) and drill-tested veins suggests that shallow to moderate south–southwest plunging ore shoots occur at jogs and steps in the shear vein system, which is compatible with a dominantly reverse sense. Discrete-style veins are observed in the Raven, Kensington Zone 41, Elmira, Eureka, Comet, and Jualin deposit areas.

Extension Veins
Mineralized zones of this style are defined by increa ........


Mining Methods

  • Drift & Fill
  • Longhole stoping
  • Transverse stoping
  • Longitudinal stoping
  • Cemented backfill
  • Paste backfill


Summary:

The Kensington Operations use conventional underground equipment and mining methods.

Mine Access
The primary access for all equipment and personnel to the Kensington, Raven, and Elmira underground mine areas is via the Kensington Portal at 964 ft. elevation, located on an upper bench adjacent to the main mill site at the base of Lion’s Head Mt.

There is a secondary portal at 792 ft. elevation on the east side of Lynn Canal (Comet Beach) side of the mountain, south of Haines.

The Jualin deposit is accessed by a -15% grade, nominal 15 x 17 ft decline collared from surface at 926 ft. elevation on an intermediate bench behind the main mill site.

Mining Method Selection
Stoping and paste backfill mining methods were selected and implemented based on the orebody location, ground conditions, and geological settings.

Kensington
The Kensington deposit is mined using longitudinal longhole stoping or transverse longhole stoping. Key metrics include:
• Longitudinal stopes: 25 ft maximum width, strike length of <100 ft, with 80 ft as the optimum length open;
• Transverse stopes: 40 ft width, nominal height of 75 ft, and variable lengths, from 25–150 ft along strike.

Both stope types are backfilled with paste.

When developing a level for longitudinal stoping, the drift is placed within the orebody, and follows the primary structures as much as possible to minimize waste developme ........


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityUnits2023202220212020201920182017
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required113,778115,094
All production numbers are expressed as metal in concentrate. ^ Guidance / Forecast.
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Operational Metrics:

Metrics202220212020201920182017
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required658,378 tons661,731 tons668,727 tons
Daily milling capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required
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Reserves at December 31, 2022:
Mineral Reserve estimates reported a gold cut-off grade of 0.133-0.135 oz/st Au.
Mineral Resource estimates reported a variable gold cut-off grade that ranges from 0.125–0.191 oz/ton Au.

CategoryTonnage CommodityGradeContained Metal
Proven 939 k tons Gold 0.18 oz/ton 169 koz
Probable 1,273 k tons Gold 0.189 oz/ton 240 koz
Proven & Probable 2,212 k tons Gold 0.184 oz/ton 409 koz
Measured 2,412 k tons Gold 0.276 oz/ton 665 koz
Indicated 1,309 k tons Gold 0.293 oz/ton 384 koz
Measured & Indicated 3,721 k tons Gold 0.282 oz/ton 1,049 koz
Inferred 1,246 k tons Gold 0.282 oz/ton 351 koz

Commodity Production Costs:

CommodityUnits2023202220212020201920182017
Total cash costs (sold) Gold USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,055 / oz   922 / oz  
^ Guidance / Forecast.
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Financials:

Units2023202220212020201920182017
Capital expenditures (planned) M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 44.7   36.2  
Sustaining costs M USD 20.7  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 132.9   154.5  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -14.7   -9  
Operating Cash Flow M USD 37.6  
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Pipelines and Water Supply
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Heavy Mobile Equipment:
HME TypeModelQuantityStatusRef. Date
Bolter ....................... Subscription required ....................... Subscription required Existing Dec 31, 2021
Bolter ....................... Subscription required ....................... Subscription required Existing Dec 31, 2021
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed Dec 31, 2021
Drill ....................... Subscription required ....................... Subscription required Existing Dec 31, 2021
Drill ....................... Subscription required ....................... Subscription required Existing Apr 25, 2018
Drill ....................... Subscription required ....................... Subscription required Existing Apr 25, 2018
Drill ....................... Subscription required ....................... Subscription required Existing Dec 31, 2021
Drill ....................... Subscription required ....................... Subscription required Existing Dec 31, 2021
Drill (long hole) ....................... Subscription required ....................... Subscription required Existing Dec 31, 2021
Drill (long hole) ....................... Subscription required ....................... Subscription required Existing Dec 31, 2021
Drill (long hole) ....................... Subscription required ....................... Subscription required Existing Dec 31, 2021
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed Dec 31, 2021
Drill (long hole) ....................... Subscription required ....................... Subscription required Existing Dec 31, 2021
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed Dec 31, 2021
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed Dec 31, 2021
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed Dec 31, 2021
Loader ....................... Subscription required ....................... Subscription required Existing Dec 31, 2021
Loader ....................... Subscription required ....................... Subscription required Existing Apr 25, 2018
Loader ....................... Subscription required ....................... Subscription required Existing Dec 31, 2021
Loader ....................... Subscription required ....................... Subscription required Existing Dec 31, 2021
Loader ....................... Subscription required ....................... Subscription required Existing Dec 31, 2021
Truck (underground) ....................... Subscription required ....................... Subscription required Existing Dec 31, 2021
Truck (underground) ....................... Subscription required ....................... Subscription required Existing Dec 31, 2021
Truck (underground) ....................... Subscription required ....................... Subscription required Existing Dec 31, 2021
Truck (underground) ....................... Subscription required ....................... Subscription required Existing Dec 31, 2021
Truck (underground) ....................... Subscription required ....................... Subscription required Existing Apr 25, 2021
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed Dec 31, 2021
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 5, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 3, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 3, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 3, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 3, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 3, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 3, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 3, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 3, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 3, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 3, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 3, 2023
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Staff:

EmployeesYear
Subscription required 2022
Subscription required 2021
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017
Subscription required 2016
Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2023
Corporate Presentation 2022
Form 10-K 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Form 10-K 2018
Press Release 2018
Technical Report 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Press Release 2016
Press Release 2016
Year-end Mineral Reserves 2016
Annual Report 2015
Technical Report 2015
Year-end Mineral Reserves 2015
Annual Report 2013
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