Source:
p. 35
Company | Interest | Ownership |
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:
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. ........

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 ........

Source:

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Flow Sheet:
Summary:

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Production:
Commodity | Product | Units | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
Copper
|
Payable metal
|
M lbs
| ...... ^ | ......  | ......  | ......  | 47 | 54 | 57 |
Gold
|
Payable metal
|
koz
| ...... ^ | ......  | ......  | ......  | ......  | ......  | ......  |
Copper
|
Concentrate
|
kt
| | ......  | ......  | ......  | 106 | 122 | 126 |
^ Guidance / Forecast.
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Operational Metrics:
Metrics | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
Total tonnes mined
| ......  | ......  | 39,466 kt | 33,225 kt | 41,966 kt | |
Ore tonnes mined
| ......  | ......  | 15,736 kt | 13,461 kt | 21,501 kt | |
Tonnes milled
| ......  | ......  | 16,350 kt | 13,556 kt | 17,743 kt | 19,277 kt |
Daily milling rate
| ......  | ......  | | | | 53,000 t |
Daily processing capacity
| ......  | ......  | 60,000 t | | | |
Waste
| ......  | ......  | | | | 20,363 kt |
Daily mining rate
| ......  | ......  | | | | 110,000 t |
Stripping / waste ratio
| ......  | ......  | | | | |
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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.
Category | Tonnage | Commodity | Grade | Contained 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
|
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