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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
Processing
  • Gravity separation
  • Flotation
Mine Life9 years (as of Jan 1, 2020)
Latest NewsCenterra Gold Records 2020 Net Earnings of $408.5 million or $1.39 per Common Share, Adjusted Net Earnings (Non-GAAP) of $461.9 million or $1.57 per Common Share...     February 24, 2021


Owners & OPERATOR

Source: p. 10
CompanyInterestOwnership
Centerra Gold Inc. 100 % Indirect
Thompson Creek Metals Company Inc. (operator) 100 % Direct

Deposit Type

  • Porphyry


Summary:

Mount Milligan is a tabular, near-surface, alkalic copper-gold porphyry deposit that measures some 2,500 metres (m) north-south, 1,500 m east-west and is +400 m thick. It consists of two principal zones, the Main Zone and Southern Star (SS) Zone. The Main Zone includes four contiguous sub-zones: MBX, WBX, DWBX and 66, all of which are spatially associated with the MBX monzonite stock and Rainbow Dyke. The SS Zone is centred on a monzonite stock of the same name and is some 1000 m south of the Main Zone.

Main Zone mineralization and associated alteration are primarily hosted in volcanic rocks, whereas in the SS Zone, mineralization is hosted equally in monzonite stock and volcanic rocks. Mineralization in both zones consists of pyrite, chalcopyrite and magnetite with bornite localized along intrusive-volcanic contacts. The pyritic 66 sub-zone is notable in that it is comparatively gold-rich.

Copper-gold mineralization is primarily associated with potassic alteration which decreases in intensity outwards from the monzonite stocks. Pyrite content increases significantly outward from the stocks where it occurs in association with propylitic alteration, which forms a halo around the potassic-altered rocks.


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 greater than $7.64 (C$9.55) per tonne and with a copper grade greater than or equal to 0.12% is designated as standard ore. Material with a value greater than $7.64 (C$9.55) per tonne with copper grades less than 0.12% are designated as HGLC (high-gold low- copper) ore.

The ultimate pit haul roads have been designed with an overall 34 m width that will include an outside berm (4.84 m wide, 1.82 m high) and ditches (1.00 m) for dual lane passing of 227-t haul trucks (8.28 m) with a one-half truck width (4.12 m) for truck separation. On each side of the truck, an allowance of 4.23 m for rubble buildup and safety berm creep has been included. Roads have been designed with a maximum 10% down grade.

The current LOM Plan consists of nine Phases, building off previous Phases, 1 and 2, which are now complete. The mine is currently operating in Phases 3 and 4 with initial stripping started in Phase 8 in the Southern Star Pit. Phases 3, 4, 5, 6a, 6 and 7 are focused on the Main Zone while Phases 8, 9a and 9 will focus on the Southern Star Pit. The phases are not mined sequentially. The LOM schedule is focused on returning the highest value ore as early as possible while honouring metallurgical constraints.


Crushing and Grinding


Processing

  • Gravity separation
  • Flotation

Flow Sheet: Subscription required

Summary:

The Mount Milligan process plant was originally designed to process ore at a nominal rate of 60,000 t/d, producing a marketable concentrate containing copper, gold, and silver. A secondary crushing circuit, installed in 2016, together with process plant optimization projects, increased the throughput to a nominal rate of 62,500 t/d. Key process equipment consists of:

• Primary crushing plant with a 1.525 m x 2.794 m gyratory crusher

• Secondary crushing plant with two cone crushers prior to the grinding circuit, each powered by one 1,000 kW motor

• SAG/ball mill/pebble crusher grinding circuit:
- one SAG mill with one 23.5 megawatt (MW) gearless motor drive
- two ball mills each driven by two 6.5 MW variable speed synchronous motors (26 MW total installed ball mill power), operated in closed circuit with cyclones
- two cone crushers, each powered by one 750 kW motor

• Flotation circuits:
- rougher flotation: two ........

Recoveries & Grades:

CommodityParameter2019201820172016201520142013
Copper Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Head Grade, % 0.260.20.180.190.260.270.3
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 0.530.710.640.580.640.640.55
Subscription required - Subscription is required.

Production:

CommodityProductUnits201920182017201620152014
Copper Payable metal M lbs  ......  Subscription required  ......  Subscription required54577165
Copper Concentrate dmt  ......  Subscription required  ......  Subscription required121,502125,600140,721125,385
Gold Payable metal oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Operational Metrics:

Metrics201920182017201620152014
Total tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required17,994 kt15,245 kt
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required19,277 kt16,138 kt14,290 kt
Stripping / waste ratio  ......  Subscription required  ......  Subscription required  ......  Subscription required0.8 0.74
Daily processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required60,000 t
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required20,363 kt14,413 kt11,224 kt
Daily milling rate  ......  Subscription required  ......  Subscription required  ......  Subscription required53,000 t44,214 t39,151 t
Daily mining rate  ......  Subscription required  ......  Subscription required  ......  Subscription required110,000 t
Subscription required - Subscription is required.

Reserves at December 31, 2018:

CategoryTonnage CommodityGradeContained Metal
Proven 211,649 kt Copper 0.183 % 853 M lbs
Proven 211,649 kt Gold 0.4 g/t 2,600 koz
Probable 235,913 kt Copper 0.189 % 983 M lbs
Probable 235,913 kt Gold 0.3 g/t 2,136 koz
Proven & Probable 447,562 kt Copper 0.186 % 1,836 M lbs
Proven & Probable 447,562 kt Gold 0.3 g/t 4,736 koz
Measured 74,001 kt Copper 0.092 % 150 M lbs
Measured 74,001 kt Gold 0.3 g/t 779 koz
Indicated 268,232 kt Copper 0.148 % 878 M lbs
Indicated 268,232 kt Gold 0.2 g/t 1,943 koz
Measured & Indicated 342,233 kt Copper 0.136 % 1,028 M lbs
Measured & Indicated 342,233 kt Gold 0.2 g/t 2,722 koz
Inferred 40,984 kt Copper 0.127 % 115 M lbs
Inferred 40,984 kt Gold 0.3 g/t 411 koz

Commodity Production Costs:

CommodityUnits201920182017
Cash costs (sold) Gold USD  ......  Subscription required† 370 / oz†
All-in sustaining costs (sold) Copper USD  ......  Subscription required  ......  Subscription required 1.47 / lb
All-in sustaining costs (sold) Gold USD  ......  Subscription required  ......  Subscription required 663 / oz
All-in sustaining costs (sold) Gold USD  ......  Subscription required†  ......  Subscription required† 505 / oz†
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units201920182017
OP mining costs ($/t mined) USD 2.192.221.86
Processing costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Financials:

Units201920182017
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required


Heavy Mobile Equipment as of December 31, 2019:
HME TypeModelSizeQuantity
Dozer (crawler) ....................... Subscription required 1
Dozer (crawler) ....................... Subscription required 1
Dozer (crawler) ....................... Subscription required 5
Dozer (rubber tire) ....................... Subscription required 2
Drill ....................... Subscription required 203 mm 1
Drill ....................... Subscription required 311 mm 2
Drill ....................... Subscription required 203 mm 1
Excavator ....................... Subscription required 1
Excavator ....................... Subscription required 2
Excavator ....................... Subscription required 1
Grader ....................... Subscription required 1
Grader ....................... Subscription required 2
Grader ....................... Subscription required 1
Loader ....................... Subscription required 2
Loader ....................... Subscription required 1
Loader ....................... Subscription required 1
Loader ....................... Subscription required 1
Loader ....................... Subscription required 2
Shovel (rope) ....................... Subscription required 41 cu. m 2
Truck (haul) ....................... Subscription required 190 t 2
Truck (haul) ....................... Subscription required 220 t 13
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 4, 2020
....................... Subscription required ....................... Subscription required Subscription required Jun 4, 2020
....................... Subscription required ....................... Subscription required Subscription required Jun 4, 2020
....................... Subscription required ....................... Subscription required Subscription required Jun 4, 2020
....................... Subscription required ....................... Subscription required Subscription required Jun 4, 2020
....................... Subscription required ....................... Subscription required Subscription required Jun 4, 2020
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
Press Release 2021
Press Release 2021
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 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 Records 2020 Net Earnings of $408.5 million or $1.39 per Common Share, Adjusted Net Earnings (Non-GAAP) of $461.9 million or $1.57 per Common Share... February 24, 2021
Centerra Gold Reports 2020 Gold Production of 824,059 Ounces Exceeding Annual Guidance January 14, 2021
Centerra Gold Announces 2019 Year-End Mineral Reserves and Resources, Mount Milligan Technical Report and Fourth Quarter Exploration Update March 26, 2020
Centerra Gold Exceeds 2019 Gold Production Guidance Producing 783,308 Ounces and Announces 2020 Outlook including Öksüt Mine Production February 11, 2020

Aerial view:

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