STRATEGIC MINE PLANNING INTEGRATING COMPUTER SOFTWARE, SIMULATION, AND SOCIAL RESPONSIBILITY

8/9/2019 STRATEGIC MINE PLANNING INTEGRATING COMPUTER SOFTWARE, SIMULATION, AND SOCIAL RESPONSIBILITY

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, ,

Sukumar Bandopadhyay, PhD, PE.Professor of Mining Engineering, University of Alaska

Fairbanks, AK, USA

Raja V. Ramani, Ph.D., P.E.

Professor of Mining Engineering Emeritus, Pennsylvania State University,USA


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• Underground copper + zinc mine• Sulphur + Oxides in stockworks

• Expected production: 3,000 tpd

• Metallurgy for copper: flotation

(sulphur) and leaching (oxide)(zinc will be considered a byproduct

for this exercise)

• Expected run-of-mine grade:

11+/- 2% (sulphur)

6+/- 1.5% (oxide)

• Stopes:

- sulphur A (grade: 20 +/- 4%)B (6 +/- 2.7%)

- oxides C (grade 8+/- 2.1%)

D (5+/-3%)


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Stope A

Stope B

Stope C

Stope D

Oxide Zone

Concentrator Plant

Sulphur Zone

SULPHUR

BINOXIDE

BIN

Passenger

loading level

(shift change)

Leaching Pad

Mine Layout


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Stope A

Stope B

Stope C

Stope D

Oxide Zone

Concentrator Plant

5 +/-3 min.

3 +/-1 min.

4 +/-1.5 min.

2 +/-.6 min.

2 min.

7 +/-4 min.

STK-SSTK-O

y

Sulphur Zone

SULPHUR

BINOXIDE

BIN

Passenger

loading level

(shift change)

Leaching Pad

QBIN-SQBIN-O

15 +/5 min.

A C?


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• Run-of-Mine Grade for Sulphur & Oxides

• Number of Trucks and Scoops

• Negotiating Time between ore and personnel transport

• Average R-O-M production

A C?

• Availability of Ore Bins

• Availability of Stockpiles

• Availability of Locomotive – number of mine cars

• Consider changes in current infrastructure, i.e. number of cars, equipment units,

skips and bin capacities for a production increase from 3,000 to 5,000 tpd


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E


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Tonnage Output of Cu during a 30-day simulation

0

200400

600

800

1000

1200

1 3 5 7 9 1 1

1 3

1 5

1 7

1 9

2 1

2 3

2 5

2 7

2 9

Days

T o n s

Suplhides Oxides

Variation of Cu grade during a 30-day simulation

0

2

4

6

8

1 3 5 7 9 1 1

1 3

1 5

1 7

1 9

2 1

2 3

2 5

2 7

2 9

Days

%

Sulphides Oxides


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•• : :

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10/12/201110/12/2011

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.. D E A D E A


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D E A D E A(A (A 2011) 2011)

Q1: What is the best way to design the mine?There might be 16 different scenarios:Cut-off grade (Oz/ton): 0.15, 0.18, 0.20, 0.22;

Stope width (ft): 15, 20, 25, 30.

Lantern 3 Pit: 2010~2011NorthLantern

Pit

DeclineQ2: How many reserves we can generate?2010MY Model total resource:

800,000 ounces; average grade @ 0.25;

Q3: What are the options for ventilation?How much air we need, what is the best wayto establish the vent system so we can start production in Q4?

( )


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3 43 4

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1600 ft; Φ14~16ft

NPV with 0.2 cutoff designs:

,

Estimated cost: $3~5M

-$6.5M

@ $950 gold price, 10% discount rate

Mining from Bottom Up

Mine Ventilation Design Option 2: Dual DeclineMine Ventilation Design Option 2: Dual Decline(Adapted from Wang, 2011)(Adapted from Wang, 2011)


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~10,000 ft, 16’X16’, $11M,

$45KNPV with 0.2 cutoff designs:


Mining from Multiple Levels

Mine Ventilation Design Option 3: Vent Decline + ShortMine Ventilation Design Option 3: Vent Decline + ShortVentVent RaisesRaises (Adapted(Adapted from Wfrom Wangang 2011)2011)


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Vent Decline: 1400 ft, $1.5M

Main Fan

Φ 12~14ft;~$500,00

NPV with 0.2 cutoff designs: $3.1M


Mining from Multiple Levels

Exhausting or Forcing?Exhausting or Forcing?


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If the depositgrows significantly

Main Fan

D C


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2011.

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SUMMER SUNSET IN FAIRBANKS


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STRATEGIC MINE PLANNING INTEGRATING COMPUTER SOFTWARE, SIMULATION, AND SOCIAL RESPONSIBILITY