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Canada
Mount Milligan Mine

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 Location:
155 km NW from Prince George, British Columbia, Canada

  Address:
26 rainbow, Forest Service R
Bulkley-Nechako C
British Columbia, Canada
V0J 2H5
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  • Overview
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  • 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 Life2033
The Mount Milligan Mine is a conventional truck shovel open-pit copper and gold mine and process plant. The Mount Milligan Mine is currently permitted by the Province of British Columbia to operate at an average of 60,000 tpd over a calendar year.


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

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Deposit Type

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


Summary:

The Mount Milligan deposits are categorized as silica-saturated alkalic Cu-Au porphyry deposits (Lang et al., 1995; Panteleyev, 1995) associated with alkaline monzodioritic-to-syenitic igneous rocks and are recognized in only a few mineral provinces worldwide (Deyell and Tosdal, 2004). 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 chalcopyrit ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The mining operation is a conventional shovel and truck open pit mine feeding a 60,000 tpd (permitted throughput on an annualised basis) processing plant. The planned mine life is just over 11 years (2022 – 2033). The pit has been planned as a series of seven discrete pushbacks and scheduled to maximize the production of ore. Total ore and waste will be mined at a rate of 54.3 Mt/a in 2023, 51.9 Mt/a in 2024 and decreasing to 19.6 Mt/a by 2032 with the last reclaim of 1.9 Mt from the stockpile in 2033. This yields an overall LOM waste:ore ratio of 0.88:1.0. The mining sequence has been developed to allow for provision of suitable waste material for annual TSF construction requirements.

Pit slope designs are based on double-benching 15 m high benches and consider haulage ramp positioning, safety berms and other geotechnical features required to maintain safe inter-ramp angles (IRA) and overall slope angles.

Equipment sizing for ramps and working benches is based on the use of 229 t rigid-frame haul trucks. The operating width used for the truck is 8.3 m. This means that double lane widths are 34 m (three times the operating width plus berm and ditch). Ramp gradients are 10% in the pit.

MINE SCHEDULE
The 2022 LOM mine schedule considers pit mining from 2023 onward and stockpile reclaim (and includes a forecast stockpile balance at the end of 2022 of 2.7 Mt), delivers 220.9 Mt of mill feed grading 0.37 g/t gold and 0.18 % copper from 2023 – ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Production:

CommodityProductUnits2023202220212020201920182017
Copper Payable metal M lbs  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required4754
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 required  ......  Subscription required106122
^ Guidance / Forecast.
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Operational Metrics:

Metrics202220212020201920182017
Total tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required39,466 kt33,225 kt41,966 kt
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required15,736 kt13,461 kt21,501 kt
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required16,350 kt13,556 kt17,743 kt
Daily milling rate  ......  Subscription required  ......  Subscription required  ......  Subscription required
Daily milling capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required60,000 t
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required23,730 kt19,764 kt
Daily mining rate  ......  Subscription required  ......  Subscription required  ......  Subscription required
Stripping / waste ratio  ......  Subscription required  ......  Subscription required  ......  Subscription required
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Reserves at December 31, 2022:
The open pit mineral reserves are estimated based on an NSR cut-off of $7.40 per tonne (C$9.62 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 reported based on a copper equivalent (“CuEq”) value of 0.20% CuEq. This value is equivalent to a 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. Copper equivalent was calculated using the following formula: CuEq=Cu%+((Au recovery*Au price*14.5833)/(Cu recovery* Cu price))*Au g/t/10,000.

CategoryTonnage CommodityGradeContained Metal
Proven 68,866 kt Copper 0.2 % 302 M lbs
Proven 68,866 kt Gold 0.37 g/t 818 koz
Probable 155,091 kt Copper 0.18 % 600 M lbs
Probable 155,091 kt Gold 0.37 g/t 1,824 koz
Proven & Probable 223,957 kt Copper 0.18 % 902 M lbs
Proven & Probable 223,957 kt Gold 0.37 g/t 2,643 koz
Measured 37,047 kt Copper 0.2 % 165 M lbs
Measured 37,047 kt Gold 0.26 g/t 304 koz
Indicated 145,686 kt Copper 0.16 % 530 M lbs
Indicated 145,686 kt Gold 0.31 g/t 1,436 koz
Measured & Indicated 182,734 kt Copper 0.17 % 695 M lbs
Measured & Indicated 182,734 kt Gold 0.3 g/t 1,740 koz
Inferred 5,685 kt Copper 0.07 % 8 M lbs
Inferred 5,685 kt Gold 0.46 g/t 83 koz

Commodity Production Costs:

CommodityUnits2023202220212020201920182017
Cash costs (sold) Copper USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Cash costs (sold) Gold USD  ......  Subscription required&nbs  ......  Subscription required  ......  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  ......  Subscription required 1.77 / lb   1.47 / lb  
All-in sustaining costs (sold) Gold USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 751 / oz   663 / oz  
All-in sustaining costs (sold) Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 764 / oz†   505 / oz†  
All-in costs Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†
^ Guidance / Forecast.
† Net of By-Product.
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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:

Units2023202220212020201920182017
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 42.7   30  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 42.7   30  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 263   368.8  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Earnings M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Operating Cash Flow M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
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Water Supply
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Heavy Mobile Equipment as of December 31, 2021:
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 (blasthole) ....................... Subscription required 311 mm ....................... Subscription required
Drill (blasthole) 222 mm ....................... Subscription required
Excavator ....................... Subscription required 22 cu. m ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required 19 cu. m ....................... Subscription required
Shovel (rope) ....................... Subscription required 41 cu. m ....................... Subscription required
Truck (dump) ....................... Subscription required ....................... Subscription required
Truck (haul) ....................... Subscription required 181 t ....................... Subscription required
Truck (haul) ....................... Subscription required 229 t ....................... Subscription required
Truck (water) ....................... Subscription required ....................... Subscription required
Truck (water) ....................... Subscription required ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 18, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 18, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 18, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 18, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 18, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 18, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 18, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 18, 2023
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2022
Subscription required 2021
Subscription required 2020
Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
Press Release 2023
Annual Information Form 2022
Form 40-F 2022
Press Release 2022
Year-end Mineral Reserves 2022
................................... Subscription required 2021
................................... 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
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