GoldSim Advanced Training Workshop ©Golder Associates Inc., 2003

Slide 1

GoldSim Player Model for On-Line

Mine Water Management

Alan KeizurGoldSim Technology Group

Golder Associates Inc.Redmond, Washington

USA

GoldSim Advanced Training Workshop ©Golder Associates Inc., 2003

Slide 2

Agenda

l Case study of an operational model for mine water management– Purpose of the model– Brief description of the system and model– Use of Dashboards to provide an intuitive user interface– Experience with model to date

GoldSim Advanced Training Workshop ©Golder Associates Inc., 2003

Slide 3

GoldSim Mining Applications

l GoldSim has been used many times to support decision making in the mining industry– Mine Permitting, Regulatory Approval– Mine Development– Mine Closure

l This application was designed operational decision making on an ongoing basis

GoldSim Advanced Training Workshop ©Golder Associates Inc., 2003

Slide 4

Antamina Mine

l Copper mine in Perul Key features include:

– Open Pit– Tailings Dam and Pond– Fresh water reservoir– Concentrator– Complex diversion system with multiple

routing options– Mine waters discharge to a river with

extensive human use (fishing, irrigation, etc.)

GoldSim Advanced Training Workshop ©Golder Associates Inc., 2003

Slide 5

Aerial Photo

GoldSim Advanced Training Workshop ©Golder Associates Inc., 2003

Slide 6

Antamina Mine Site

GoldSim Advanced Training Workshop ©Golder Associates Inc., 2003

Slide 7

Antamina Mine Site

GoldSim Advanced Training Workshop ©Golder Associates Inc., 2003

Slide 8

Receiving Waters

GoldSim Advanced Training Workshop ©Golder Associates Inc., 2003

Slide 9

Partial Schematic Diagram

GoldSim Advanced Training Workshop ©Golder Associates Inc., 2003

Slide 10

GoldSim Model Development

l Based upon existing spreadsheet water balance and mass balance models

l Expanded to reflect recent site configuration changes

l Added additional detail to water transfer system

GoldSim Advanced Training Workshop ©Golder Associates Inc., 2003

Slide 11

GoldSim Model Overview

l Contains component models for the following:– Water Balance Model

• Climate model– Historical precipitation record (for benchmarking)– Stochastic precipitation record– Custom User-Defined precipitation events

• Runoff and Surface Evaporation (expressed as monthly coefficients)

– Simple Mass Balance Model• Includes Cu, Zn, Pb, Mo, So4, NH4, NO3

• Comparison with various criteria at selected locations

– Tailings Production Model (based on ore campaign)

GoldSim Advanced Training Workshop ©Golder Associates Inc., 2003

Slide 12

Model Dashboard

GoldSim Advanced Training Workshop ©Golder Associates Inc., 2003

Slide 13

Example Result (Pond Elevation)

GoldSim Advanced Training Workshop ©Golder Associates Inc., 2003

Slide 14

Benchmark Results of Initial ModelComparación del nivel de la poza de relave

4002.0

4002.5

4003.0

4003.5

4004.0

4004.5

4005.0

4005.5

4006.0

4006.5

4007.0

4007.5

1/10

/02

11/1

0/02

21/1

0/02

31/1

0/02

10/1

1/02

20/1

1/02

30/1

1/02

10/1

2/02

20/1

2/02

30/1

2/02

9/1/

03

19/1

/03

29/1

/03

8/2/

03

18/2

/03

28/2

/03

10/3

/03

Date, días

Ele

vaci

ón

, m

Real

Gold Sim

GoldSim Advanced Training Workshop ©Golder Associates Inc., 2003

Slide 15

Benchmark Results of Revised ModelComparación del nivel de la poza de relave

4002.0

4002.5

4003.0

4003.5

4004.0

4004.5

4005.0

4005.5

4006.0

4006.5

4007.0

4007.5

1/10

/02

11/1

0/02

21/1

0/02

31/1

0/02

10/1

1/02

20/1

1/02

30/1

1/02

10/1

2/02

20/1

2/02

30/1

2/02

9/1/

03

19/1

/03

29/1

/03

8/2/

03

18/2

/03

28/2

/03

10/3

/03

Date, días

Ele

vaci

ón

, m

Real

Gold Sim

GoldSim Advanced Training Workshop ©Golder Associates Inc., 2003

Slide 16

Next Steps

l Update mass loading model to reflect results of an ongoing geochemistry study

l Update model to reflect changes at the sitel Examine uncertainty in model parameters

(e.g., runoff coefficients) l Add submodel for the open pit and adjacent

basin