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Canada
Mount Polley Mine

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 Location:
56 km NE from Williams Lake, British Columbia, Canada
  Address:
PO Box 12
Likely
British Columbia, Canada
V0L 1N0
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News
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Overview

StageProduction
Mine TypeOpen Pit & Underground
Commodities
  • Copper
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
  • Longhole open stoping
  • Cemented backfill
Production Start...
Mount Polley mine operations were suspended in May 2019, and the mine restarted operations in late June 2022.

Through 2019 into 2021, site personnel continued to maintain access, fire watch, manage collection, treatment and discharge of site contact water, and actively monitor the tailings storage facility. In the fourth quarter of 2021, Mount Polley Mining Corp. took the initial steps towards recommencement of operations at the Mount Polley mine. Stripping operations began to enable milling operations to restart in 2022. The crushing plant was commissioned by 2022 year end providing crush material for winter road maintenance.

The plans for 2023 include continuous improvement in the plant of availability, recovery and throughput. Mining operations will focus on mining the Springer phase 4 Pit and the tailings that were deposited in the Springer Pit in 2015 and 2016.

Owners

Source: p. 9,15
CompanyInterestOwnership
Imperial Metals Corp. 100 % Indirect
Mount Polley Mining Corp. (operator) 100 % Direct
Mount Polley Mining Corporation, a subsidiary of the Imperial Metals Corp., is owner/operator of the Mount Polley copper-gold mine.

Contractors

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Deposit Type

  • Porphyry
  • Breccia pipe / Stockwork

Summary:

Mount Polley is an alkalic porphyry copper-gold deposit. It lies in the tectono-stratigraphic Quesnel terrane or Quesnellia, which is characterized by a Middle Triassic to Early Jurassic assemblage of volcanic, sedimentary and plutonic rocks which formed in an island arc tectonic setting outboard of the ancestral North American continental margin. Quesnellia hosts several major porphyry copper deposits such as Highland Valley, Copper Mountain, AftonAjax, Gibraltar and Mount Milligan, all generated by early Mesozoic, calc-alkalic or alkalic arc magmatism.

In the Mount Polley region, the Triassic arc rocks are assigned to the Nicola Group and comprise alkalic basaltic to andesitic volcanics and sedimentary rocks, which are intruded by sub-volcanic stocks; all are overlain by post-Nicola, Early Jurassic clastic rocks and rare volcanics. Mount Polley itself is a complex of alkalic intermediate porphyritic intrusions and related magmatic-hydrothermal breccias. It was emplaced into the Nicola Group in the Late Triassic around 205 million years ago. The intrusive complex is about 6 km long (north-northwest) and 3 km wide, lying between Polley Lake in the east and Bootjack Lake in the west. The intrusions range from diorite (oldest) to monzonite (youngest) and are marginally undersaturated in silica. The Mount Polley Intrusive Complex is in the centre of the Mount Polley property; the remainder of the property is underlain mainly by Nicola Group volcanics and p ........

Mining Methods

  • Truck & Shovel / Loader
  • Longhole open stoping
  • Cemented backfill

Summary:

Mount Polley mine operations were suspended in May 2019, and the mine restarted operations in late June 2022.

Mining Methods - conventional shovel, truck and open pit mine. With a developing underground mine.

Open Pit Mining Equipment
The current open pit mining operation at Mount Polley utilizes a conventional truck and shovel fleet with drilling and blasting prior to excavation. The fleet includes a mixture of diesel and electrically powered equipment for drilling, excavating and dewatering.

Material Handling
Ore mined from the pits is hauled to either the primary gyratory crusher located immediately adjacent to the mill or to nearby stockpiles.

Waste material at Mount Polley occurs in one of two types: non-acid generating waste (NAG), and potentially acid-generating waste (PAG). NAG/PAG designations are made on the basis of the neutralizing potential ratio (NPR) of a given material. This NPR is calculated by performing acid-base accounting (ABA) using carbon and sulfur assays from blasthole cutting samples. Sampling is performed on a one sample per 20,000 tonnes basis. All rock with an NPR less than 2.0 and a sulfur content greater than 0.1% is designated as PAG and stockpiled.

PAG waste is estimated to constitute approximately 27% of the waste tonnage in the life-of-mine plan. PAG waste, as a condition of operating permits, must be submerged for long-term storage at the end of mine life. As suc ........

Crushing and Grinding
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Processing

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Summary:

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Production:
Mount Polley Mine operations were suspended in May 2019, and the mine restarted operations in late June 2022.

CommodityUnits20232022201920182017
Copper M lbs  ......  Subscription required ^  ......  Subscription required  ......  Subscription required1519
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver oz  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in concentrate. ^ Guidance / Forecast.
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Operational Metrics:

Metrics20222021201920182017
Daily milling rate  ......  Subscription required14,776 t16,975 t18,420 t
Daily milling capacity  ......  Subscription required  ......  Subscription required
Tonnes milled  ......  Subscription required  ......  Subscription required2,231,119 t6,195,760 t6,723 kt
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Reserves at January 1, 2023:
The 2023 Mineral Reserve estimate for open pit mining, a $1 per tonne MHV (Mill Head Value) cut-off is employed.

Mineral Resource cut-off utilized a $1 per tonne MHV cutoff price.

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 53,568,270 t Copper 0.342 % 403,429,000 lbs
Proven & Probable 53,568,270 t Gold 0.319 g/t 550,000 oz
Proven & Probable 53,568,270 t Silver 0.895 g/t 1,542,000 oz
Measured & Indicated 202,209,000 t Copper 0.287 % 1,280,652,000 lbs
Measured & Indicated 202,209,000 t Gold 0.304 g/t 1,974,000 oz
Measured & Indicated 202,209,000 t Silver 0.527 g/t 3,425,000 oz
Inferred 15,048,000 t Copper 0.157 % 52,097,000 lbs
Inferred 15,048,000 t Gold 0.177 g/t 85,000 oz
Inferred 15,048,000 t Silver 0.125 g/t 61,000 oz

Commodity Production Costs:

CommodityUnits2022201920182017
Cash costs Copper USD
Total cash costs Copper USD  ......  Subscription required  ......  Subscription required 1.94 / lb†   2.32 / lb†  
† Net of By-Product.
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Financials:

Units2022202120202019201820172016
Capital expenditures M CAD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 13.3   27.7   26.7  
Revenue M CAD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 104.4   163.5   131.5  
After-tax Income M CAD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -35   -27.2   -19.3  
Subscription required - Subscription is required

Heavy Mobile Equipment as of May 20, 2016:
HME TypeModelSizeQuantity
Bolter ....................... Subscription required ....................... Subscription required
Bulldozer ....................... Subscription required ....................... Subscription required
Bulldozer ....................... Subscription required ....................... Subscription required
Drill ....................... Subscription required ....................... Subscription required
Drill ....................... Subscription required ....................... Subscription required
Drill ....................... Subscription required
Drill jumbo (two boom) ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Loader (FEL) ....................... Subscription required ....................... Subscription required
Scissor Lift ....................... Subscription required
Scoop Tram ....................... Subscription required
Scoop Tram ....................... Subscription required
Shovel ....................... Subscription required ....................... Subscription required
Shovel ....................... Subscription required ....................... Subscription required
Truck (haul) ....................... Subscription required ....................... Subscription required
Truck (haul) ....................... Subscription required ....................... Subscription required
Truck (underground) 25 t ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 8, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 8, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 8, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 8, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 8, 2023
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Staff:

EmployeesYear
Subscription required 2018
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
Annual Information Form 2022
Financial Review 2022
Management Discussion & Analysis 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Annual Report 2018
Annual Information Form 2017
Annual Report 2017
Press Release 2017
Annual Information Form 2016
Annual Report 2016
Technical Report 2016
Annual Information Form 2015
Annual Report 2015
Other 2015
Year-end Mineral Reserves 2015
Annual Information Form 2014
Annual Report 2014
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