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Chile
Candelaria Complex (Candelaria Mine, Española Project, Ojos Del Salado Mine)

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 Location:
16 km S from Copiapó, Chile

  Address:
Inside Ojancos Bridge Km. 9
Tierra Amarilla
Chile
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Overview

StageProduction
Mine TypeOpen Pit & Underground
Commodities
  • Copper
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
  • Sub-level stoping
Processing
  • Crush & Screen plant
  • Flotation
  • Magnetic separation
Mine Life2044
Latest NewsLundin Mining Provides Update on Labour Action at Candelaria     October 18, 2020


Owners

Source: p. 77
CompanyInterestOwnership
Sumitomo Corp. 4 % Indirect
Sumitomo Metal Mining Co., Ltd 16 % Indirect
Lundin Mining Corp. 80 % Indirect
Lundin Mining Corp. owns 80% of Compañia Contractual Minera Candelaria S.A. and Compañia Contractual Minera Ojos del Salado S.A.’s copper mining operations and supporting infrastructure in Chile. The remaining 20% ownership stake is held by Sumitomo Metal Mining Co., Ltd. and Sumitomo Corporation.

Deposit Type

  • Breccia pipe / Stockwork
  • IOCG
  • Vein / narrow vein
  • Manto


Summary:

The copper-gold sulphide mineralization present at the Candelaria Copper Mining Complex is generally referred to as iron oxide copper gold (“IOCG”). Depending on lithology and the structural setting, the polymetallic sulphide mineralization can occur as veins, hydrothermal breccias, replacement mantos, and calcic skarns (Sillitoe, 2003).

The Candelaria IOCG deposit lies within the metamorphic aureole of ae Lower Cretaceous magmatic arc plutonic complex that is located within the Candelaria-Punta del Cobre district, Atacama Region, northern Chile. IOCG deposits are primarily defined by their elevated magnetite and/or hematite with elevated copper and gold contents (Sillitoe, 2003). The IOCG belt located in the Coastal Cordillera of northern Chile and southern Peru is part of a volcano-plutonic arc of Jurassic to Early Cretaceous age. The arc is characterized by voluminous tholeiitic to calc-alkaline plutonic complexes of gabbro to granodiorite composition and primitive, mantle-derived parentage. Major arc- parallel fault systems developed in response to extension and transtension induced by subduction roll-back at the retreating convergent margin.

The sulphide mineralization occurs in breccias, stockwork veinlets, disseminations in andesite, and as an internal tuff unit. There are also some localized controls to mineralization in the form of faults, breccias, veins, and foliation. Candelaria has become an exploration model for Andean-type IOCG deposits that display close relationships to the plutonic complexes and broadly coeval fault systems. Depending on lithology and the structural setting, the polymetallic sulphide mineralization can occur as veins, hydrothermal breccias, replacement mantos, and calcic skarns. The Candelaria IOCG system lies within the thermal aureole of the Lower Cretaceous magmatic arc plutonic suite in the Candelaria-Punta del Cobre district.

The main mineralized body at the Candelaria mine is hosted in rocks of the Punta del Cobre Formation. Specifically, the host rocks are massive andesite and breccias of the lower andesite, and volcanic tuffs and volcaniclastic rocks at the base of the upper andesite. In the metasedimentary rock, the mineralization is confined to a few isolated layers (mantos).

The mineralized body is up to 400 metres thick in its central part and thins towards the edges. In east-west sections, the mineralization has a lenticular, downward concave shape with a steep eastern limb and a shallowly dipping western limb. The shape of the mineralized body in north-south section is irregular. In plan view, the extent of the mineralization is approximately 1,400 metres by 2,400 metres. The mineralized body was folded after its formation. The north-northeast-trending fold axis corresponds to the Tierra Amarilla anticline.

The mineralization assemblage in the Candelaria mine consists of chalcopyrite, magnetite, pyrite, pyrrhotite, and sphalerite. Biotite, calc-silicate minerals, and potassium feldspar constitute the gangue minerals. Pervasive potassic alteration is associated with the mineralization.

Chalcopyrite is the only primary copper sulphide present in the Santos mine. Additionally to copper mineralization, there are economic values of gold. Most frequent gangue minerals are pyrite, magnetite, actinolite, k-feldspar, chlorite, biotite and hematite.

In the Santos mine, three types of mineralized bodies are observed: veins, mantos, and breccia bodies. An important vein in the Santos mine is the Isabel, which is oriented northwest-striking, and extends over 1 kilometre in length and between 4 and 30 metres in width. Manto-type mineralization occurs as tabular bodies hosted in two sedimentary horizons located in the floor and roof of the albitophyre. The manto mineralization is characterized by variable iron contents with magnetite common in the north and deeper areas, and specular hematite in the south. Mineralization occurs within breccia bodies is typically contained with the albitoforo and lower andesite and is formed by steeply west-dipping and north-northwest- to northwest-striking bodies.

Mineralized bodies at the Alcaparrosa mine have a manto-type geometry that trend to the northeast and dip to the west. Ore and gangue mineralogy consists of chalcopyrite, pyrite, and magnetite, with trace pyrrhotite, molybdenite, and arsenopyrite.

Mineralization styles at the Alcaparrosa mine also occurs as veinlets defining dense stockwork, breccias (hydrothermal potassium feldspar and magnetite), as well as fine dissemination in biotite meta-andesites. High grade bodies are also found in massive veins striking north-northwest, north, and east.


Mining Methods

  • Truck & Shovel / Loader
  • Sub-level stoping


Summary:

Minera Candelaria consists of the Candelaria Open Pit and the Candelaria Underground mines. Minera Ojos del Salado consists of the Santos and Alcaparrosa underground mines. The Candelaria and the Minera Ojos del Salado facilities are close to each other.

The Candelaria Open Pit mine operates with an overall mining rate of approximately 310,000 tonnes per day over the next 10 years including an average of 45,000 tonnes per day of ore sent to the Candelaria processing plant together with substantial quantities of ore recovered from the WIP stockpiles. The average grade of the ore that will be mined from the open pit over the remaining life of mine (LOM) is estimated at 0.49 percent copper, while stockpiled work-in-progress material is estimated to have an average grade of 0.33 percent copper.

The LOM plan for the Candelaria Copper Mining Complex is largely driven by supplying ore to the Candelaria processing plant from the Candelaria and Española open pit open pits although higher grade underground sources are of increasing importance. Surface WIP stockpiles are fed to the plant once the open pit Mineral Reserves have been depleted. The open pit and work-in-progress stockpile Proven and Probable Mineral Reserves are estimated at 499.9 million tonnes at an average grade of 0.45 percent copper, 0.11 gram of gold per tonne, and 1.47 grams per tonne silver.

The Candelaria open pit was designed to be mined in several phases of development. As of June 2018, five phases of development remain in the LOM plan (Phases 9 to 13). The overall strip ratio is expected to be 2.45:1 including ore that is initially delivered to stockpiles. The total in-pit waste is 939.6 million tonnes and the overall life of the open pit mine is 17 years.

For the Española project the total in-pit waste is 83.2 million tonnes and the overall life estimated in 7 years.

The three underground mines (Candelaria Underground, Santos, and Alcaparrosa) utilize a sublevel stoping mining method for ore extraction. This method is ideal for relatively large, vertical, as well as thick deposits with favourable and stable host rock. Stopes can typically be up to 180 metres high with sublevels at 20 to 60 metre intervals. The length of the stopes is generally 40 to 100 metres with widths varying between 20 to 30 metres. Stopes are drilled down from the sublevel drilling drifts as benches using 114 to 140 mm diameter down-the-hole holes. The holes are loaded and blasted in vertical slices towards an open face created by the slot blasting. The blasted ore gravitates to the bottom of the stope and is collected in draw points at the production level below. This lower level also consists of the haulage (transport) drift. The undercut levels, which feed the draw points, are 15 to 20 metres high and inclined at 50 to 60 degrees to allow the blasted ore to flow easily by gravity. An Epiroc Simba tophammer rig drills 64 mm up holes within the undercut, which are loaded and blasted with the downholes. Once the stope is mined, a remaining rib pillar, which can be another 20 to 30 metres wide, may be blasted into the stope to increase the extraction tonnage. Typically, a 20-metre structural pillar remains between each stope and no backfill is used at these operations. Mucked ore is dumped into 60 tonne underground trucks or 30 tonne highway type trucks (being replaced by the former trucks) and hauled up the ramp to a surface stockpile for subsequent re-handling and processing.

In early 2022, a feasibility study was completed for expansion of throughput of the underground mines from 15 ktpd to 30 ktpd and included underground crushing and conveying systems and a surface secondary crushing plant. In 2022, the Company expects to commence basic engineering of the potential expansion. All open pit pushbacks and associated pit slopes are geotechnically evaluated by independent experts to validate the design parameters. Similarly, underground stoping areas are evaluated for overall stability.


Crushing and Grinding
Flow Sheet: Source
Crusher / Mill TypeModelSizePowerQuantity
Gyratory crusher 60" x 89" 1
Jaw crusher 48" x 60" 1
Cone crusher ....................... Subscription required 7' 3
Pebble crusher 3
SAG mill 36' X 17' 2
Ball mill 20' x 30' 4
Ball mill ....................... Subscription required 10.5' x 13' 2
Ball mill 6' x 5' 2
Ball mill ....................... Subscription required 9' x 9' 1
Regrind 14' x 22' 1
Vertical mill / Tower 800 HP 1
Vertical mill / Tower 1250 HP 1

Summary:

Minera Candelaria
Run-of-mine ore is trucked to a primary gyratory crusher. The crushed product is transported using an overland conveyor belt to a coarse ore stockpile with a combined live and dead capacity of 500,000 tonnes. Semi-autogenous grinding (SAG) mills are followed by pebble crushing, with separate grinding of a portion of the crushed pebbles and the remainder brought back to the SAG mills. This circuit is followed by closed-circuit ball milling with hydrocyclones to classify the flotation feed size.

Minera Ojos del Salado
The concentrator flowsheet comprises a closed-circuit crushing plant including a primary jaw crusher (48 by 60 inches), a secondary cone crusher and two tertiary cone crushers.

The grinding plant has three ball mills (one 9 by 9 feet and two 10.5 by 13 feet) operating in parallel and in closed-circuit with hydrocyclones.


Processing

  • Crush & Screen plant
  • Flotation
  • Magnetic separation

Flow Sheet: Subscription required

Summary:

The Candelaria processing plant receives ore from the Candelaria Open Pit and the Candelaria Underground (North Sector) and Alcaparrosa underground mines. It has a nameplate capacity of 75,000 tonnes per day. The Pedro Aguirre Cerda (PAC) processing plant receives ore from the Santos underground mine and has a design capacity of 3,800 tonnes per day.

The Candelaria processing plant flowsheet is conventional, comprising two parallel process lines for grinding and flotation, reclaimed process water from a conventional tailings dam, final concentrate filtration, and shipping of bulk copper concentrates. Run of mine ore is trucked to a primary gyratory crusher. Grinding takes place in a multi-stage closed circuit using semi- autogenous grinding (SAG) mills, ball mills, and pebble crushing. A multi-stage flotation circuit using an arrangement of mechanical cells, regrind mills and column cells produces copper concentrate. Final flotation copper concentrate with gold and silver by ........

Recoveries & Grades:

CommodityParameter2021202020192018201720162015
Copper Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required91.292.691.892.7
Copper Head Grade, %  ......  Subscription required  ......  Subscription required  ......  Subscription required0.530.670.570.64
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required68.9
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required0.12

Production:

CommodityUnits2022202120202019201820172016
Copper M lbs  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required297405367
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver koz  ......  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:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required28,753 kt17,799 kt28,005 kt30,915 kt
Tonnes milled  ......  Subscription required  ......  Subscription required26,287 kt27,585 kt29,435 kt31,938 kt
Annual processing capacity  ......  Subscription required  ......  Subscription required28.3 Mt
Daily milling capacity  ......  Subscription required  ......  Subscription required78,800 t78,800 t78,800 t
Subscription required - Subscription is required.

Reserves at June 30, 2021:
Candelaria and La Española open pit Mineral Resource estimates are reported with cut-off grades of 0.15% and 0.17% copper, respectively. Underground Mineral Resources are estimated at a cut-off grade of 0.45% copper.
Mineral Reserves for the Candelaria open pit, Española open pit and underground for the Candelaria property are estimated at cut-off grades of 0.16%, 0.19% and 0.50% copper, respectively.

CategoryTonnage CommodityGradeContained Metal
Proven 540,929 kt Copper 0.5 % 2,717 kt
Proven 540,929 kt Gold 0.12 g/t 2.1 M oz
Proven 540,929 kt Silver 1.72 g/t 30 M oz
Probable 134,645 kt Copper 0.64 % 867 kt
Probable 134,645 kt Gold 0.16 g/t 0.7 M oz
Probable 134,645 kt Silver 2.08 g/t 9 M oz
Proven & Probable 675,574 kt Copper 0.53 % 3,583 kt
Proven & Probable 675,574 kt Gold 0.12 g/t 2.7 M oz
Proven & Probable 675,574 kt Silver 1.8 g/t 39 M oz
Measured 874,003 kt Copper 0.59 % 5,141 kt
Measured 874,003 kt Gold 0.13 g/t 3.7 M oz
Measured 874,003 kt Silver 1.99 g/t 56 M oz
Indicated 370,541 kt Copper 0.73 % 2,712 kt
Indicated 370,541 kt Gold 0.16 g/t 1.9 M oz
Indicated 370,541 kt Silver 2.26 g/t 27 M oz
Measured & Indicated 1,245 Mt Copper 0.63 % 7,840 kt
Inferred 99,029 kt Copper 0.75 % 739 kt
Inferred 99,029 kt Gold 0.19 g/t 0.5 M oz
Inferred 99,029 kt Silver 2.83 g/t 7 M oz

Commodity Production Costs:

CommodityUnits2021202020192018201720162015
Credits (by-product) Copper USD  ......  Subscription required  ......  Subscription required  ......  Subscription required -0.22 / lb -0.22 / lb -0.21 / lb -0.19 / lb
Cash costs Copper USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 1.9 / lb 1.44 / lb 1.52 / lb 1.44 / lb
Cash costs Copper USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1.68 / lb† 1.22 / lb† 1.31 / lb† 1.25 / lb†
All-in sustaining costs (AISC) Copper USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 3.34 / lb† 2.04 / lb† 1.63 / lb† 1.66 / lb†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units2022202120202019201820172016
Capital expenditures (planned) M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required498.6   335   109.8  
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required491   322.6   105  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required838.8   1,230   847.7  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required181   563.7  
Operating Income M USD 756.1   402.2  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required109.7   392.7   174.9  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 7, 2022
....................... Subscription required ....................... Subscription required Subscription required Mar 7, 2022
....................... Subscription required ....................... Subscription required Subscription required Mar 7, 2022
....................... Subscription required ....................... Subscription required Subscription required Mar 7, 2022
....................... Subscription required ....................... Subscription required Subscription required Mar 7, 2022
....................... Subscription required ....................... Subscription required Subscription required Mar 7, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2021
Subscription required Subscription required Subscription required 2020

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Management Discussion & Analysis 2018
Technical Report 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Technical Report 2017
Annual Information Form 2016
Management Discussion & Analysis 2016
Press Release 2016
Annual Information Form 2015
Management Discussion & Analysis 2015
Technical Report 2015
Form 10-K 2013
Subscription required - Subscription is required.

News:

NewsDate
Lundin Mining Provides Update on Labour Action at Candelaria October 18, 2020

Aerial view:

Subscription required - Subscription is required.

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