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United States
Kensington Mine

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 Location:
7 km N from Juneau, Alaska, United States

  Address:
3031 Clinton Dr., Ste. 202
Juneau
Alaska, United States
99801
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Drift & Fill
  • Transverse stoping
  • Longitudinal stoping
  • Paste backfill
Production Start...
Mine Life3 years (as of Jan 1, 2021)


Owners

Source: p. 22
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 Kensington and Jualin deposits are located in the Berners Bay mining district which lies on the northern end of the Juneau Gold Belt, a 120 mile long, 10 mile wide structural zone containing numerous mesothermal gold deposits. The district is flanked by Triassic aged mafic metavolcanic rocks to the east-northeast and Cretaceous aged pelitic sediments to the west-southwest. The contact between these two units has been intruded by the northwest-trending, Cretaceous aged Jualin Diorite stock measuring approximately five miles long by three miles wide. Regional deformation and shearing within and adjacent to the Jualin Diorite has resulted in emplacement of numerous goldbearing, mesothermal quartz-carbonate vein deposits.

The Kensington deposit is a mesothermal orogenic deposit of gold-bearing quartz veins.

The Project area retains additional exploration potential, as many of the areas along the three district-scale structural trends (Comet, Orval, and Lion’s Head shear zones) that host numerous gold occurrences have received only limited modern exploration attention.

The deposits with economic significance exhibit two distinct habits:

1. High-grade shear-hosted veins of limited strike and dip length within a narrow halo of locally auriferous quartz-veined diorite, and

2. Vein packages comprised of extensional vein arrays, sheeted extensional veins, and stacked en-echelon shear veins.

Vein mineralization is cha ........


Mining Methods

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


Summary:

The mine property consists of two contiguous mineral claim groups controlled by Coeur Alaska: the Kensington Group and Jualin Group. The Kensington Group hosts the Raven, Kensington, Eureka, Johnson, and Elmira deposits. The Jualin Group hosts the Jualin and the Empire deposits.

The primary access to the Kensington and Raven underground mine areas is via the Kensington Portal at the 964-foot elevation. The Kensington Portal (previously known as the Jualin Portal) is in the same general area as the mill and ore stockpile. The Kensington Portal is the primary equipment and personnel travel way. The Comet Portal (792-foot elevation), on the eastern shore of Lynn Canal, serves as the secondary escapeway for the underground mine.

The primary mining method is transverse longhole stoping with paste backfill and mainly used in the center area at Kensington. Drilling shows that the Kensington orebody narrows to the north and south (4 to 20 feet thick), thus longitudinal longhole stoping is used. In Raven longitudinal longhole stoping is the predominate mining method as the orebody is mainly narrow, between 5 to 20 feet thick, with most of mining in material 5 feet or less in thickness.

A minor amount of drift and fill mining has been done in Kensington Block E (Zone 41). Where a drift is driven (15 × 15 feet) parallel to the ore boundary, and driven within the structure until the vein is too narrow to economically drive on, then the remaining ore is e ........


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityUnits2022202120202019201820172016
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required113,778115,094124,331
All production numbers are expressed as metal in concentrate. ^ Guidance / Forecast.
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Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required
Tonnes milled  ......  Subscription required  ......  Subscription required658,378 tons661,731 tons668,727 tons620,209 tons
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Reserves at December 31, 2021:
Mineral Reserve reported above a gold cut-off grade of 0.143-0.201 oz/st Au.
Mineral Resource reported above a variable gold cut-off grade that ranges from 0.116–0.164 oz/ton Au.

CategoryTonnage CommodityGradeContained Metal
Proven 656 k tons Gold 0.191 oz/ton 125 koz
Probable 690 k tons Gold 0.197 oz/ton 136 koz
Proven & Probable 1,346 k tons Gold 0.194 oz/ton 261 koz
Measured 2,860 k tons Gold 0.231 oz/ton 660 koz
Indicated 1,263 k tons Gold 0.256 oz/ton 323 koz
Measured & Indicated 4,123 k tons Gold 0.238 oz/ton 983 koz
Inferred 1,915 k tons Gold 0.238 oz/ton 455 koz

Commodity Production Costs:

CommodityUnits2022202120202019201820172016
Total cash costs (sold) Gold USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,055 / oz   922 / oz   795 / oz  
^ Guidance / Forecast.
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Operating Costs:

Units20212020
UG mining costs ($/ton mined) USD 7068
Processing costs ($/ton milled) USD  ......  Subscription required  ......  Subscription required
G&A ($/ton milled) USD  ......  Subscription required  ......  Subscription required
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Financials:

Units2022202120202019201820172016
Capital expenditures (planned) M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 44.7   36.2   36.8  
Sustaining costs M USD 20.7   22.8  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 132.9   154.5   146.6  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required -14.7   -9   10.4  
Operating Cash Flow M USD 37.6   50.8  
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Heavy Mobile Equipment as of April 25, 2018:
HME TypeModelQuantity
Drill ....................... Subscription required ....................... Subscription required
Drill ....................... Subscription required ....................... Subscription required
Drill ....................... Subscription required ....................... Subscription required
Drill ....................... Subscription required ....................... Subscription required
Drill ....................... Subscription required ....................... Subscription required
Drill (long hole) ....................... Subscription required ....................... Subscription required
Drill (long hole) ....................... Subscription required ....................... Subscription required
Drill (long hole) ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Truck (underground) ....................... Subscription required ....................... Subscription required
Truck (underground) ....................... Subscription required ....................... Subscription required
Truck (underground) ....................... Subscription required ....................... Subscription required
Truck (underground) ....................... Subscription required ....................... Subscription required
Truck (underground) ....................... Subscription required ....................... Subscription required
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Mine Management:

Job TitleNameEmailProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 25, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 25, 2022
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....................... Subscription required ....................... Subscription required Subscription required Nov 25, 2022
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Staff:

EmployeesYear
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 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
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................................... Subscription required 2020
................................... Subscription required 2020
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................................... 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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