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Canada
Red Chris Mine

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 Location:
17 km SE from Iskut, British Columbia, Canada

  Regional Office:
580 Hornby Street, Suite 200
Vancouver
British Columbia, Canada
V6C 3B6
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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
  • Flotation
Mine Life28.3 years (as of Jan 1, 2015)
FY2020 production and financial outcomes are reported from date of acquisition (15 August 2019) to 30 June 2020 and represent Newcrest’s 70% share.
Latest NewsNewcrest Announces Its Initial Mineral Resource Estimate for Red Chris     March 30, 2021


Owners & OPERATOR

Source: p. 6, 141
CompanyInterestOwnershipInvestor's Info
Imperial Metals Corp. 30 % Indirect
Newcrest Mining Ltd. 70 % Indirect
Red Chris Development Company Ltd. (operator) 100 % Direct
On 10 March 2019, Newcrest Mining Limited and its wholly owned subsidiary Newcrest Red Chris Mining Limited entered into an Asset Purchase Agreement (‘APA’) with TSX-listed Imperial Metals Corporation to acquire a 70% joint venture interest in, and operatorship of, the Red Chris mine and surrounding tenements in British Columbia, Canada (Red Chris Joint Venture) for US$806.5 million. Transaction completed
15 August 2019

Deposit Type

  • Porphyry
  • Vein / narrow vein


Summary:

The Red Chris deposit displays characteristics of both alkalic and calc-alkalic porphyry copper deposits.

Alkalic features are:
- the paucity of quartz in the pre-mineral monzodiorite and late-mineral porphyry phases,
- the relatively high K2O, Na2O lithogeochemistry of the Stuhini Group volcanics,
- its copper-gold metal signature (versus copper-molybdenum for most calc-alkalic systems),
- magnetite-bearing potassic alteration,
- the unusually high copper-gold grades, at least in part of the system (in contrast, calc-alkalic deposits tend to be bulk mineable lower grade ore bodies).
Calc-alkalic features are:
- the large tonnage of the deposit,
- the relatively simple and centralized alteration pattern,
- the intense quartz-sericite-pyrite or ‘phyllic’ alteration, which is generally underdeveloped in alkalic systems, especially in British Columbia,
- the strong association of copper sulfides with quartz veins.

Prospecting and drilling in the Red stock has delineated several zones of significant copper-gold mineralization in the central part of the stock. The two principal zones targeted for mine development currently are the East zone, and the Main zone, centred 800 metres to the west. The intervening area has been termed the Saddle zone, which is somewhat less well mineralized. At surface, East zone and Main zone mineralization extends at least 1,500 metres along the stock’s east-northeast axis; in width, it ranges from at least 200 metres in the East zone to 500 metres in the Main zone. The depth of significant mineralization is over 1,000 metres in the East zone and about 1,000 metres in the centre of the Main Zone.

A further 1.5 km to the west of the Main zone are the Gully and Far West zones. The Gully zone footprint is approximately 400-500 metres across, east-west. The Far West zone has a smaller footprint and has seen less drilling than the other zones. Some mineralization in the Far West zone is hosted in Stuhini Group country rocks close to the stock’s northern contact.

Prominent limonitic gossans and natural kill zones occur within the steep slopes and drainages over the Gully and Far West zones. However, in areas without drainage relief such as over the East and Main zones, weak limonite extends only 1 or 2 metres beneath the top of the bedrock. The overlying gravel till layer is often very limonitic or composed of ferricrete. Thus, it appears that glaciation has removed any of the supergene mineralization that might have existed over the Red Chris deposit. However, supergene chalcocite mineralization has reportedly been intersected in shallow drilling near the headwaters of the East Gully drainage. Chalcocite occurs along with malachite, azurite and manganese oxides in this oxidized zone.

Copper sulfide mineralization is disseminated, occurs in quartz veins, and in microfractures. Quartz veins range from microveinlets about a millimetre thick to domains of quartz flooding several centimetres thick. The veins can be wavy and anastomosing, or form intricate stockworks, and most may be characterized as A-veins. In mineralized A-veins, quartz forms fine and ‘sugary’ interlocking grains, hosting fine specks or coarser blebs of bornite and/or chalcopyrite, +/- magnetite. Zones of higher quartz vein density may represent composite A-veins due to repeated fissuring along vein margins or other zones of weakness. Some of these may have the appearance of ‘B-veins’ due to a central seam of bornite or chalcopyrite, but most are probably A-veins as they lack the vein-normal crystal growths and terminations associated with true B-veins; some B-veins have been recognized, but they are comparatively minor. In addition to the dominant quartz veinhosted and disseminated mineralization, a minor amount of moderate- to high-grade copper is associated with K-feldspar or biotite-altered halos around early fractures (early dark micaceous or ‘EDM’ veins; see Proffett, 2009).

Bornite and chalcopyrite frequently occupy mafic mineral sites due to the partial or complete replacement of hornblende or biotite. Bornite can be very finely disseminated and easily mistaken for dark red or blue-black specular hematite. Gold is present in microscopic inclusions in bornite and chalcopyrite. Fine molybdenite occurs locally in veinlets of various stages around the strongest Cu-Au zones, especially on the north side of the East zone. Sphalerite and galena occur very locally, usually in trace amounts, in veins or fracture coatings.

Pyrite occurs commonly as very fine- to coarse-grained, anhedral to euhedral disseminations, fracture fillings, and veins. Within the mineralized zones, pyrite content increases upwards, generally concomitant with a decrease in bornite. It ranges from less than 1% to over 10%, with the highest abundance in a halo peripheral to the higher grade copper mineralization (where it is not truncated by faulting). Pyrite is abnormally low or absent in the high-grade East zone except near the surface, but it is quite ubiquitous throughout the Main zone ore and elsewhere in the Red stock. Late-stage pyrite (± minor chalcopyrite) veins cut quartz vein stockworks, and are particularly common in the upper levels of the mineralized system in the sericitic-argillic alteration, and these represent classic D-veins. Pyrite commonly replaces hornblende sites, even in distal parts of the Red Chris deposit.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Red Chris mine is a 30,000 t/d open pit conventional milling operation with mining rates of approximately 130,000 t/d. The mining fleet includes an Atlas Copco 351 Pit Viper rotary drill, a Komatsu PC 7000 electric hydraulic excavator, a P&H 2800 electric shovel, a Hitachi 3600 diesel hydraulic shovel, a Komatsu PC2000 diesel hydraulic excavator, a Caterpillar 994 wheel loader, ten Caterpillar 793 haul trucks, five Caterpillar 785 haul trucks, five Caterpillar 777 haul trucks, and associated support equipment. Other mining fleet equipment includes five Caterpillar D10 dozers, three Atlas Copco 780 DTH drills, one Caterpillar 988 wheel loader and one 40 tonne capacity articulated truck.


Mining is currently occurring in the Phase 4 pushback and the Phase 5 pushback, both of which are located in the Main zone portion of the ore body. Mining of NAG material (required for PAG dump foundation blanket, road and project requirements) is also being supplemented by targeted development within the Phase 6 pushback footprint. Pits are mined using 12 m high benches and combinations of single and double-benching at various slope angles. Run-of-mine barren rock from the open pit is placed north of the East zone in a rock disposal site where topography allows any runoff to be collected and directed to the processing plant for use and treatment, prior to reporting to the TIA.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
Gyratory crusher 1.4m x 2m 1
Pebble crusher 600 kW 1
SAG mill 10.4m x 4.7m 1
Ball mill 7.3m x 12.8m 1
Ball mill 2200 1
Vertical mill / Tower 1120 1

Summary:

Plant design is based on a standard porphyry copper flow sheet employing SAG and ball milling, flotation, regrinding, thickening and filtering to produce a concentrate for export averaging 27% copper at a moisture content of 8%. The grinding circuit would include a 10.36m x 4.72m x 11,200kW SAG mill feeding one 7.32m x 12.80m x 13,428kW ball mill providing a primary grind of K80 of -150µ. Coarse rejects from the SAG mill would be crushed in a 600kW pebble crusher. Ball mill discharge would feed one bank of 5 x 200m³ rougher flotation cells followed by 1 x 183m3 and 1 x 61m3 cleaner flotation columns and a bank of 5 x 100m³ cleaner scavenger flotation cells. Cyclone underflow would be fed to a 4.12 m x 6.93m x 2,200kW primary regrind ball mill and a 4.6m x 4.4m x 14.3m x 1,120kW secondary regrind vertical mill to provide a K80 of -24µ. The primary and regrind product sizes were determined by G&T Metallurgical Services Ltd. to provide the optimum conditions for copper recovery and concentrate grade. Concentrate would be thickened and filtered and then loaded on B-Train trucks of nominal 50 tonne capacity for hauling to the Port of Stewart for shipment to smelters in the Pacific Rim.


Processing

  • Flotation

Source: Subscription required

Summary:

Plant design is based on a standard porphyry copper flow sheet employing SAG and ball milling, flotation, regrinding, thickening and filtering to produce a copper concentrate at a moisture content of 8% for export.

Ball mill product feeds a bank of six 200 m³ rougher flotation cells followed by a 180 m3 scavenger/sulphide tank cell. The cleaning circuit includes one 183 m3 and one 61 m3 cleaner flotation columns and a bank of five 100 m³ cleaner scavenger flotation cells. Regrind cyclone underflow is fed to a 2,200 kW primary regrind ball mill and a 1,120 kW secondary regrind vertical mill to provide a grind of approximately 80% passing 24 microns. The primary and regrind product sizes were determined by the AMEC Americas Ltd. feasibility study to provide the optimum conditions for copper recovery and concentrate grade. Concentrate is thickened and filtered, and then loaded on trucks of nominal 40 tonne capacity for hauling to the Port of Stewart, for subsequent shipment ........

Recoveries & Grades:

CommodityParameter202020192018201720162015
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required434937.9
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required0.230.310.26
Copper Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required7977.568.1
Copper Head Grade, %  ......  Subscription required  ......  Subscription required  ......  Subscription required0.410.510.48

Production:

CommodityUnits2021202020192018201720162015
Copper M lbs  ......  Subscription required ^  ......  Subscription required  ......  Subscription required63758458
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in concentrate. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Total tonnes mined  ......  Subscription required
Ore tonnes mined  ......  Subscription required
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required10,378,181 t9,651,738 t8,171,879 t
Daily milling rate  ......  Subscription required  ......  Subscription required  ......  Subscription required28,433 t26,371 t25,698 t
Daily mining rate  ......  Subscription required  ......  Subscription required  ......  Subscription required130,000 t100,000 t
Daily milling capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required30,000 t30,000 t30,000 t
Subscription required - Subscription is required.

Reserves at December 31, 2017:

CategoryOreTypeTonnage CommodityGrade
Measured In-Situ (OP) 682.4 Mt Copper 0.31 %
Measured In-Situ (UG) 148.4 Mt Copper 0.55 %
Measured Total 830.7 Mt Copper 0.36 %
Measured In-Situ (OP) 682.4 Mt Gold 0.27 g/t
Measured In-Situ (UG) 148.4 Mt Gold 0.75 g/t
Measured Total 830.7 Mt Gold 0.36 g/t
Measured In-Situ (OP) 682.4 Mt Silver 1.04 g/t
Measured In-Situ (UG) 148.4 Mt Silver 1.78 g/t
Measured Total 830.7 Mt Silver 1.17 g/t
Measured In-Situ (OP) 682.4 Mt Copper Equivalent 0.48 %
Measured In-Situ (UG) 148.4 Mt Copper Equivalent 1 %
Measured Total 830.7 Mt Copper Equivalent 0.57 %
Indicated In-Situ (OP) 165.5 Mt Copper 0.27 %
Indicated In-Situ (UG) 37.5 Mt Copper 0.43 %
Indicated Total 203 Mt Copper 0.3 %
Indicated In-Situ (OP) 165.5 Mt Gold 0.24 g/t
Indicated In-Situ (UG) 37.5 Mt Gold 0.5 g/t
Indicated Total 203 Mt Gold 0.29 g/t
Indicated In-Situ (OP) 165.5 Mt Silver 0.9 g/t
Indicated In-Situ (UG) 37.5 Mt Silver 1.5 g/t
Indicated Total 203 Mt Silver 1.01 g/t
Indicated In-Situ (OP) 165.5 Mt Copper Equivalent 0.41 %
Indicated In-Situ (UG) 37.5 Mt Copper Equivalent 0.74 %
Indicated Total 203 Mt Copper Equivalent 0.47 %
Measured & Indicated In-Situ (OP) 847.9 Mt Copper 0.31 %
Measured & Indicated In-Situ (UG) 185.8 Mt Copper 0.53 %
Measured & Indicated Total 1,035 Mt Copper 0.35 %
Measured & Indicated In-Situ (OP) 847.9 Mt Gold 0.27 g/t
Measured & Indicated In-Situ (UG) 185.8 Mt Gold 0.7 g/t
Measured & Indicated Total 1,035 Mt Gold 0.35 g/t
Measured & Indicated In-Situ (OP) 847.9 Mt Silver 1.01 g/t
Measured & Indicated In-Situ (UG) 185.8 Mt Silver 1.72 g/t
Measured & Indicated Total 1,035 Mt Silver 1.14 g/t
Measured & Indicated In-Situ (OP) 847.9 Mt Copper Equivalent 0.47 %
Measured & Indicated In-Situ (UG) 185.8 Mt Copper Equivalent 0.95 %
Measured & Indicated Total 1,035 Mt Copper Equivalent 0.56 %

Commodity Production Costs:

CommodityUnits202020192018201720162015
Cash costs Copper USD  ......  Subscription required† 2.34 / lb† 1.93 / lb† 1.37 / lb† 1.58 / lb†
All-in sustaining costs (AISC) Gold USD  ......  Subscription required
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units202120202019201820172016
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required
Capital expenditures M  ......  Subscription required  ......  Subscription required62.9  CAD57.8  CAD 123.12  CAD
Revenue M  ......  Subscription required  ......  Subscription required255.74  CAD289.08  CAD 295.32  CAD
After-tax Income M  ......  Subscription required-89.66  CAD0.4  CAD -8.73  CAD
EBIT M  ......  Subscription required
EBITDA M  ......  Subscription required
Operating Cash Flow M  ......  Subscription required
Subscription required - Subscription is required


Heavy Mobile Equipment as of December 31, 2018:
HME TypeModelSizeQuantity
Dozer ....................... Subscription required 5
Drill ....................... Subscription required 3
Drill ....................... Subscription required 1
Excavator ....................... Subscription required 1
Excavator ....................... Subscription required 1
Loader ....................... Subscription required 1
Loader ....................... Subscription required 1
Shovel (hydraulic) ....................... Subscription required 1
Shovel (rope) ....................... Subscription required 1
Truck (haul) 40 t 1
Truck (haul) ....................... Subscription required 10
Truck (haul) ....................... Subscription required 5
Truck (haul) ....................... Subscription required 5
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 31, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 31, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 31, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 31, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 31, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 31, 2021
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2018
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... 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
Annual Information Form 2015
Annual Report 2015
Press Release 2015
Technical Report 2015
Year-end Mineral Reserves 2015
Annual Information Form 2014
Subscription required - Subscription is required.

News:

NewsDate
Newcrest Announces Its Initial Mineral Resource Estimate for Red Chris March 30, 2021
Imperial Reports 2020 Financial Results March 17, 2021
Imperial Acquires 30% Interest in the GJ Property March 15, 2021
Newcrest Mining Limited - Exploration Update 11 March 2021 March 10, 2021
Imperial Reports Commencement of Construction on Portal Site at Red Chris February 10, 2021
Imperial Metals Corporation: Red Chris Drill Hole Returns 3.0 g/t Gold and 1.5% Copper Over 166 Metres September 9, 2020
Imperial Reports Red Chris Exploration Update June 10, 2020
Imperial Metals: Red Chris Drill Hole Returns 1.7% Copper and 3.3 g/t Gold Over 276 Metres March 10, 2020
Imperial Closes Sale of a 70% Interest in Red Chris August 15, 2019
Imperial Metals Corp. To Enter Joint Venture With Newcrest Mining March 10, 2019

Aerial view:

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