Minera Candelaria Tailings Storage Facilities Transition ... · 4 Lundin Mining –Diversified Global Portfolio 1. Lundin Mining holds an indirect 24% equity stake in the Freeport

1

Minera Candelaria

Tailings Storage Facilities

Transition ExperienceApril 2019

TSX: LUN Nasdaq Stockholm: LUMI

Candelaria, Atacama Region, Chile

3

AGENDA

Lundin Mining, Candelaria District

TSF Candelaria description and capacity

TSF distribution System - Water recovery – Monitoring

Natural events

TSF Los Diques – construction/transition

TSF Summary/Inspections and review

Conclusions/Learnings

4

Lundin Mining – Diversified Global Portfolio

1. Lundin Mining holds an indirect 24% equity stake in the Freeport Cobalt Oy business which includes a cobalt refinery located in Kokkola, Finland.

2. Lundin Mining holds an 80% interest in Candelaria.

Eagle

Níquel-Cobre-PGMs

(USA)

Candelaria2

Cobre-Oro-Plata

(Chile)

Neves-Corvo

Cobre-Zinc

(Portugal)

Zinkgruvan

Zinc-Plomo-Cobre

(Suecia)

Freeport Cobalt1

Refinería de Cobalto

(Finlandia)

Lundin Mining

Casa Matriz

(Toronto, Canadá)

5

Candelaria District

The district is formed by Candelaria Open Pit,

Candelaria Norte, Santos and Alcaparrosa ore

deposits.

The ore extracted from these deposits is processed in the

Candelaria and Pedro Aguirre Cerda (PAC) concentrator Plants.

The copper concentrate produced is shipped at the Punta

Padrones Mechanized Clean Port in Caldera.

The Desalination Plant provides 100% of water

process demand. Is located In the same industrial

complex as the Port.

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Candelaria 2030: Operacional continuity

STATUS: EIA approved (July 2015)

Main

FEATURES

MINE

Expansion of the pit to exploit new mineral reserves

WASTE FACILITIESIncrease in the storage volume of waste

TSF Los DiquesConstruction of a new tailing facility

MINE LIFE Extension of the mine life operation from 2018 to 2030

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Crushing

Stockpile

MINEBOTADERO

NORTE

Capacity

BOTADERO

NORTEEl Buitre area

BOTADERO

NANTOCO

Capacity

STOCK PILE

BAJA LEY

Concentrator

Plant

Tailings Thickener

Concentrate

Thickener

Concentrator Storage Punta Padrones Port

Candelaria Tailings

Storage Facility

301.9 Mm3

Sterile

Sterile

Stock baja ley

Tailings

Copper

Concentrate

MINERAL

Remanejo

To other

destinations

Los Diques Tailings

Storage Facility

600 Mton

Hydraulic

Connection

Desalination Plant

SAG MLL

Harnero

vibratorio

Magnetita

StockpilePebbles

Crusher

Conveyor belt

CV 02

Recirculated water

South

Botadero

Aux 1

South

Botadero

Aux 2 Magnetita

Stock

Flowsheet

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AGENDA




Natural events




9

NORTH

DAM

MAIN

DAM

SOUTH

DAM

TSF Candelaria

CONCENTRATOR

PLANT

ENLACE

HIDRAULICO

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TSF Candelaria and TSF Los Diques

SOUTH

DAM

NORTH

DAM

MAIN DUM

DR Los

Diques

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TSF Candelaria – main information

Actual deposit in operation from 1994

Volume authorized : 318.4 Mm3

Volume accumulated: 309.0 Mm3

Total tonnage accumulated: 541 Mt

Actual deposit level: 795.9 masl

Crest Elevation : 800.0 masl

Authorized level: 798.5 masl

Freeboard : 1.5 m

12

TSF Candelaria – accumulated tailing 1

,4 6,9 12

,6

19

,0 31

,3 42

,3 55

,3 68

,9 83

,1 96

,3 11

0,2

12

4,0

13

7,3

15

2,7

16

7,5

18

2,0

19

5,7

20

8,8

22

2,7

23

6,2

24

9,6

26

5,4

28

2,2

29

8,0

30

5,0

30

8,8

318,4

0,0

50,0

100,0

150,0

200,0

250,0

300,0

350,0

19

94

19

95

19

96

19

97

19

98

19

99

20

00

20

01

20

02

20

03

20

04

20

05

20

06

20

07

20

08

20

09

20

10

20

11

20

12

20

13

20

14

20

15

20

16

20

17

20

18

20

19

Mm

³

Volume of accumulated tailings2

,6 12

,1

22

,4

33

,7 55

,3 74

,9 97

,9 12

1,9

14

7,1

17

0,4

19

5,0

21

9,5

24

3,0

27

0,3

29

6,4

32

2,2

34

6,3

36

9,6

39

4,3

41

8,1

44

1,9

46

9,8

49

9,5

52

6,6

53

8,9

54

1,2

564

0

100

200

300

400

500

600

19

94

19

95

19

96

19

97

19

98

19

99

20

00

20

01

20

02

20

03

20

04

20

05

20

06

20

07

20

08

20

09

20

10

20

11

20

12

20

13

20

14

20

15

20

16

20

17

20

18

20

19

TMS

Mill

on

es

Accumulated tonnage Tailings

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AGENDA




Natural events




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Tailings

management

system

Safe work

procedures

Owner policies,

regulatory

requirements, and

commitments

Internal and External

Audits

Control

· Bathymetric

· Infiltrations

· Stability of the walls

· Water phreatic level

Inspection of lines and

slopes, vortices,

maintenance of roads

Daily and weekly meetings with

maintenance staff, coordination and work

planning

Evaluate and

periodically execute

new projects, in

conjunction with

Engineering and

Management

Deposit control program


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Tailing Distribution system

TAIL

ING

S D

EPO

SITI

ON

SYST

EM

HYDR

AULI

C PU

MPS

ST

ATIO

NTA

ILIN

GS P

UMPS

THIC

KENE

RSTA

ILIN

GS

DUM

PS

THICKENERS

2; 400 ft diameter

PUMPS STATION

Gravimetric tailing3 pumping groups

3 pumps each

PUMPS

3 pumping group 5 pumps each

3 Discharge line

TAILINGS DUMP

Main DAMSouth DAMNorth DAM

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Water recovery system

WAT

ER R

ECO

VER

Y

RWS

Reco

very

Wat

er S

yste

m

RWS

Reco

very

Wat

er S

yste

mW

ater

Sys

tem

SCS

Seep

age

Colle

ctio

n sy

stem

Fresh Water

Pumping System

5 Pumps first Group6 pumps second group

(New System)

Barges

2 pumping groups2 pumps each

Tailings Thickeners

2 OVERFLOW4 Vertical pumps each

Process Water • Make up: 0.34 m3/ton

• Water recovery: 85%

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Monitoring - PI System

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AGENDA




Natural events




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1997

157,5 mm

2015 2017

65,3 mm 45,5 mm

RAINFALL EVENTS

2002

5,8º

2006 2013

6,3º 6,8º

EARTHQUAKES

Natural events- Without impacts in tailing facilities

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AGENDA




Natural events




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Para esto sugiero mencionar con un slide por tema:- Down stream construction- Espesor de capas- Granulometrías y tamaños máximos- Estudio de deformaciones coef sísmico- Análisis químico

TSF Los Diques

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• Retaining wall constructed by high strength casting, composed of

fresh rock.

• Growth method type downstream.

• Construction of the wall using compacted layers of controlled

thickness.

• Developments for the control of infiltrations: curtain wall and curtain

of injections.

• Geotechnical instrumentation to monitor the behavior of the retaining

wall.

• Strong basal drainage system.

• Quality control and monitoring for the generation of acid drainage

TSF Los Diques – Relevants aspects of the design

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Main wall section

TSF Los Diques – Drainage system

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TSF Los Diques – Main dam

MuroPrincipal Fase 0&1Muro

Principal Fase 2&3

Filters

Noviembre 2017

Elev 764

Elev 773

Elev 747

Elev 796Muro Sur

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- Fiber optic and Casagrande-type

piezometers: monitor the phreatic

level within the wall

- Accelerometers: determine the

response of the wall against seismic

events

- Inclinometers and topographic

monoliths: allow the monitoring of

displacement patterns of the wall

- Aforador: allows for the evaluation of

quantity and characteristics of

drainage flow

TSF Los Diques: Geotechnical Instrumentation

Allows for timely evaluation of the variables which control the behavior of

the wall..

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TSF Los Diques – Operational chronology 2018

January February April June October

Tailing system Hydraulic testTailing delivery by Cajón Poniente (50

% of tailing)Barges water recovery 100% tailing delivery to TSF Los Diques

Return to TSF Candelaria. Business decision

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TSF Los Diques – accumulated tailing and water recovery 2018

0,621,26

2,59

4,19

6,11

8,19

10,49

12,73

14,52

0,0

2,0

4,0

6,0

8,0

10,0

12,0

14,0

16,0

Jan Feb Mar Apr May Jun Jul Ago Sep Oct

TMS

Mill

on

es

Accumulated Tonnage Tailings

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Water recovery – Sequence

0.020.04

0.12

0.20

0.270.28

0.00

0.05

0.10

0.15

0.20

0.25

0.30

Jan Feb Mar Apr May Jun Jul Ago Sep Oct

m³

Mil

lio

ns

Volume water system Parshall

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AGENDA




Natural events




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Candelaria Tailings Facilities Summary

Active Facilities

Los Diques TSF• Thickened technical disposal (55% solids) from Candelaria Plant

• Tailing stored 15 Mm3

• One main dam and another perimeter dam

• Dam design = downstream construction

• Nearby population = highway C-397 and Candelaria operations

• Emergency plan review annually


Candelaria TSF

• Slurry tailings (35% solids) from PAC Plant and thickened tailing (55% solids)

from Candelaria Plant

• Tailing storage 305 Mm3

• One main dam and three perimeter dams

• Max main dam height = 170 m

• Dam design = downstream construction

• Emergency plan review annually


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Candelaria Tailings Dam Inspections and Reviews

32

AGENDA




Natural events




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External support

Expedite water recovery

Early involved of Candelaria team in

design and construction stages

Planning (Tailing deposit plan)

Strong water balance

Operational manual/Procedures

Availability of water production (Desal

Plant)

Training

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Documents

Minera Candelaria Tailings Storage Facilities Transition ... · 4 Lundin Mining –Diversified Global Portfolio 1. Lundin Mining holds an indirect 24% equity stake in the Freeport