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Canada
Mount Milligan Mine

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 Location:
62 km SW from Mackenzie, British Columbia, Canada

  Address:
26 rainbow, Forest Service R
Bulkley-Nechako C
British Columbia, Canada
V0J 2H5
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WebsiteWeb
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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
Commodities
  • Copper
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life2029
Latest NewsCenterra Gold Reports 2022 Production, Issues 2023 Mount Milligan Mine Guidance and Provides an Update on the Öksüt Mine     January 16, 2023


Owners

Source: p. 35
CompanyInterestOwnership
Centerra Gold Inc. 100 % Indirect
Thompson Creek Metals Company Inc. (operator) 100 % Direct
Centerra's wholly-owned subsidiary, Thompson Creek Metals Company Inc., is the holder of the rights to the Mount Milligan Mine.

Contractors

Subscription required - Subscription is required.


Deposit Type

  • Porphyry
  • Vein / narrow vein
  • Breccia pipe / Stockwork


Summary:

Mineralization at the Mount Milligan deposit consists of two styles, early-stage porphyry gold-copper (Au-Cu) and late-stage high-gold low-copper (HGLC). The early-stage porphyry Au-Cu mineralization comprises mainly chalcopyrite and pyrite, occurs with potassic alteration and early-stage vein types and is spatially associated with composite monzonite porphyry stocks (especially at their hanging-wall and footwall margins), hydrothermal breccia, and narrow dyke and breccia complexes. Late-stage, structurally controlled pyritic HGLC style mineralization is associated with carbonate-phyllic alteration and intermediate- to late-stage vein types, and is spatially associated with faults, fault breccias and faulted lithological contacts (i.e. faulted monzonite porphyry dyke margins). It crosscuts and overprints the earlier stage porphyry Au-Cu mineralization.

Porphyry style Au-Cu mineralization occurs in the hanging-wall and footwall zones of the MBX, Saddle, Southern Star, and Goldmark stocks. Disseminated and vein/veinlet-hosted mineralization is associated with the composite monzonite stocks, their brecciated margins and variably altered volcanic host rocks. Core zones of auriferous chalcopyrite-pyrite mineralization with magnetite rich potassic alteration transition laterally and vertically to pyrite rich HGLC zones within the inner propylitic (albitic) and carbonate-phyllic alteration shells; the latter appear to be late stage and exhibit strong structural control. ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The mining operation is a conventional shovel and truck open pit mine feeding a 60,000 t/d (permitted throughput) processing plant. The planned mine life is 9 years with a Proven and Probable Reserve of 191.0 million tonnes at a grade of 0.23% copper and 0.39 g/t gold. The pit has been planned as a series of discrete pushbacks and is scheduled to maximize the production of high-value ore, especially during the next three years. This strategy may necessitate mining at a higher cut-off value and the stockpiling of lower value material for processing later in the mine life. The average stripping ratio for the LOM is estimated to be 1.24:1.

The mine currently uses two electric rotary blasthole drills which drill 311 mm diameter holes, two diesel blast hole drills for 203 mm holes, two 41 m³ electric rope shovels and two 19 m3 front end loaders loading haul trucks of 220 and 190 tonnes capacity from 15m high production benches. The operation is supported by standard ancillary equipment including track and rubber tire dozers, graders and a fleet of service vehicles.

The mine operates continuously, seven days per week, using a roster schedule of predominantly 14 days on, 14 days off, with 12-hour shifts.

The overall mining sequence was developed through a series of mining pushbacks (phases) specific to the MBX, 66 and WBX subzones (collectively, the Main Zone), and the Southern Star (SS) phases.

Mineralized material with a value gr ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:

CommodityProductUnits2022202120202019201820172016
Copper Payable metal M lbs  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required475457
Gold Payable metal koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required106122126
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Total tonnes mined  ......  Subscription required  ......  Subscription required39,466 kt33,225 kt41,966 kt
Ore tonnes mined  ......  Subscription required  ......  Subscription required15,736 kt13,461 kt21,501 kt
Tonnes milled  ......  Subscription required  ......  Subscription required16,350 kt13,556 kt17,743 kt19,277 kt
Daily milling rate  ......  Subscription required  ......  Subscription required53,000 t
Daily processing capacity  ......  Subscription required  ......  Subscription required60,000 t
Waste  ......  Subscription required  ......  Subscription required20,363 kt
Daily mining rate  ......  Subscription required  ......  Subscription required110,000 t
Stripping / waste ratio  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Reserves at December 31, 2021:
The open pit mineral reserves are estimated based on an NSR cut-off of $7.64 per tonne (C$9.55 per tonne) and takes into consideration metallurgical recoveries, concentrate grades, transportation costs, smelter treatment charges and royalty and streaming arrangements in determining economic viability.
The open pit mineral resources are constrained by a pit shell and are estimated based on a copper equivalent basis which was equivalent to NSR cut-off of $7.35 per tonne (C$9.55 per tonne) and takes into consideration metallurgical recoveries, concentrate grades, transportation costs, smelter treatment charges and royalty and streaming arrangements in determining economic viability.

CategoryTonnage CommodityGradeContained Metal
Proven 107,444 kt Copper 0.23 % 534 M lbs
Proven 107,444 kt Gold 0.39 g/t 1,342 koz
Probable 42,531 kt Copper 0.21 % 201 M lbs
Probable 42,531 kt Gold 0.36 g/t 496 koz
Proven & Probable 149,975 kt Copper 0.22 % 736 M lbs
Proven & Probable 149,975 kt Gold 0.38 g/t 1,838 koz
Measured 134,531 kt Copper 0.16 % 479 M lbs
Measured 134,531 kt Gold 0.31 g/t 1,331 koz
Indicated 149,426 kt Copper 0.15 % 495 M lbs
Indicated 149,426 kt Gold 0.3 g/t 1,428 koz
Measured & Indicated 283,957 kt Copper 0.16 % 974 M lbs
Measured & Indicated 283,957 kt Gold 0.31 g/t 2,759 koz
Inferred 17,232 kt Copper 0.19 % 47 M lbs
Inferred 17,232 kt Gold 0.37 g/t 203 koz

Commodity Production Costs:

CommodityUnits202220212020201920182017
Cash costs (sold) Copper USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required  ......  Subscription required
Cash costs (sold) Gold USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required  ......  Subscription required 672 / oz  
Cash costs (sold) Gold USD 519 / oz†   370 / oz†  
All-in sustaining costs (sold) Copper USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required  ......  Subscription required 1.77 / lb   1.47 / lb  
All-in sustaining costs (sold) Gold USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required  ......  Subscription required 751 / oz   663 / oz  
All-in sustaining costs (sold) Gold USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 764 / oz†   505 / oz†  
All-in costs Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units2020201920182017
OP mining costs ($/t mined) USD 1.82.192.221.86
Processing costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Financials:

Units202220212020201920182017
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 42.7   30  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 42.7   30  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 263   368.8  
Operating Income M USD  ......  Subscription required  ......  Subscription required
Earnings M USD  ......  Subscription required  ......  Subscription required
Operating Cash Flow M USD  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required



Heavy Mobile Equipment as of December 31, 2019:
HME TypeModelSizeQuantity
Dozer (crawler) ....................... Subscription required ....................... Subscription required
Dozer (crawler) ....................... Subscription required ....................... Subscription required
Dozer (crawler) ....................... Subscription required ....................... Subscription required
Dozer (rubber tire) ....................... Subscription required ....................... Subscription required
Drill ....................... Subscription required 203 mm ....................... Subscription required
Drill ....................... Subscription required 311 mm ....................... Subscription required
Drill ....................... Subscription required 203 mm ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Grader ....................... 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
Shovel (rope) ....................... Subscription required 41 cu. m ....................... Subscription required
Truck (haul) ....................... Subscription required 190 t ....................... Subscription required
Truck (haul) ....................... Subscription required 220 t ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 8, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 8, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 8, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 8, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 8, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 8, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 8, 2022
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2021
Subscription required 2020
Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
Press Release 2022
................................... Subscription required 2021
................................... 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
Annual Information Form 2018
Management Discussion & Analysis 2018
Annual Report 2017
Technical Report 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Form 10-K 2015
Technical Report 2015
Feasibility Study Report 2009
Subscription required - Subscription is required.

News:

NewsDate
Centerra Gold Reports 2022 Production, Issues 2023 Mount Milligan Mine Guidance and Provides an Update on the Öksüt Mine January 16, 2023

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