Case Study MineSched at Sebuku

Case Study
Application of MineSched at Sebuku
April 2007
Introduction
Straits Asia Resources:

 Part of the Straits group of companies.
 Recently listed on Singapore Stock Exchange
 Operates Sebuku Coal Mine in South Kalimantan
Objectives of this Presentation:

1. Describe the geology, conditions and mining methods at
Sebuku
2. Discuss the implementation of MineSched and how it is
used in planning and Scheduling at Sebuku
Location and History
 CCOW awarded 1994

 Coal mining commenced December 1997
 First Shipment January 1998
 Mining Contractor Bukit Makmur Mandiri
Utama (BUMA)
 Plant Contractor Leightons Contracting
Indonesia (LCI)
Pulau Sebuku
 35km from north to south,

10km at widest point.
 Topography:
-series of hills to east.
-freshwater swamps to west.
 Western coast is bordered by
mangrove forests.
 Up to 2006, most coal mined
from the relatively shallow pits
to the south.
 Remaining known reserves are
in and to the west of the Tanah
Putih pit.
Production
7 Coal Production
6.0
6
Increasing production,
5 resources and reserves.
Million Tonnes
4.0
4 3.5
3.0
3 2.6 Resource convertible upon
2.0
2 land use redesignation.
1
0 100 Resources and Reserves

2003 2004 2005 2006 2007F 90 next
Over
few years
80 73
Million Tonnes 70
60
High volatile bituminous coal. 50
 Ash: 9.3% 40
29 28
 Sulphur: 0.7% 30
20 20 22
18 18
 Calorific Value: 6,300 (gad) 20
 Total Moisture: 15% 10
0
2003 2004 2005 2006
Resources (JORC) Reserves (JORC)
Geology – Cross Section
Fault
Geology
 Tanah Putih pit is located in
freshwater swamp:
Lower than high tide level
5-20m overlying mud
 Significant NE-SW oriented

normal fault system with
displacement up to 30m.
 Dip 5 to 10 degrees to west
 Strata consists of weak
mudstone and shale with
interbedded coal seams.
Pit Limit
1. Mining Method – Bund
Mangrove Swamp
Perimeter Bund
2. Mining Method – Mud
Mud Cell
Bund
Mud Face
3. Mining Method - Waste
Mud Mining: Digger positioned on
hard floor and pulls mud down.
Equipment
PC1250 excavators (8 to 9 operating units)
HD785 / HD465 trucks (>35 operating units)
4. Mining Method - Coal
Equipment
PC400 excavators (4 operating units)
Volvo FM12 trucks (> 20 operating units)
Wash
Bypass – High Ash
Bypass – Low Ash

Mining Method - Pit Dewatering
Settling Pond and Liming
Sump and Pumps

Mine Planning
Constraints that determine mining and dumping strategy:

1. Western limit is not an economic limit (land use designation)
2. Likelihood of future extensions to western permits
3. Working Space in Pit and expanding production
4. Management of Pit Water
5. Expose multiple seams for blending
Mine Planning Strategy
Pit divided into Strips (70m)
and Blocks (up to 400m)
Open up pit along the strike
Terraced mine faced exposing
different seams.
Main access road and ramps to
pit floor.
Mud and upper interburden
dumped to out of pit dumps.
Dump overburden in-pit between
ramps as the pit progresses.
Advance face at lowest area
during dry season and install
pumping infrastructure.
Mine Planning Strategy
Mud cells constructed well back from

mine face to minimise risk of failure.
Strip Z Strip Y Strip X Mud Cell
Mud 70m
OB Dump
Toe of dump offset from mine face

to assist water management.
Processing and Shipping
Coal Mining
ROM S/P
Wash Plant BP Crusher
~50% ~50%
Port S/P
Barge Loader
Mine Planning and Geology
 Surpac Vision used for geological modeling*,

surveying and mine planning.
 Company standard – used at all Straits sites.
 Ease of use.
 Consistency between sites.
 Adapted for use in a stratigraphic deposit.
Geological Model
Mine Planning and Scheduling
Challenges at Sebuku:
Pit getting deeper with production expansion.
Limited room in pit.
Large number of waste and coal fleets.
Discipline in Mining Practice
Process – Before MineSched
INPUTS
Seam DTMs, mining limits. 1. Pit Design Surpac
ROM parameters,
dilution, recovery etc. 2. Generate Reserves Spreadsheet
Waste mining equipment

and productivities.
3. Schedule Waste Mining Spreadsheet
Coal mining equipment

and productivities. 4. Schedule Coal Mining Spreadsheet
Wash plant capacity, yield. 5. Coal Wash and Production Spreadsheet
Topography, dump slopes,

design gradients and widths.
6. Ramp and Dump Design Surpac
Swell, haulage profiles. 7. Material Balance Spreadsheet
8. Communicate Plan
Process – Before MineSched
Disadvantages of Spreadsheet System:

 No graphical validation of results.
 Graphical representation of results time consuming and
tedious to generate.
 No automatic spatial precedence.
 No 3rd party support.
Advantages of Spreadsheet System:

 Flexibility
 Ease of Use
 Easy integration with downstream systems
Process – With MineSched
1. Pit Design Surpac
2. Generate Reserves
1st stage MineSched implementation.
3. Schedule Waste Mining
4. Schedule Coal Mining Spreadsheet
5. Coal Wash and Production Spreadsheet
7. Material Balance Spreadsheet
8. Communicate Plan
Scheduling Inputs
1. Pit Design (Mining Locations)
2. Block Model (ROM model)
3. Waste Equipment
4. Mining Sequence
Scheduling Outputs
1. Reports: - Coal Exposed Schedule (+qualities)

- Waste Mining Reports
2. Gantt Chart
3. Animations
4. EOP Surfaces
Scheduling Outputs
Scheduling Outputs
Future Opportunities
1. Pit Design Surpac
2. Schedule Waste Mining MineSched (ROM Model)
3. Schedule Coal Mining MineSched

1. Coal Mining, washing
and stockpiles.
4. Coal Wash and Production MineSched
6. Material Balance MineSched 2. Material Balance
7. Communicate Plan

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Case Study

Application of MineSched at Sebuku

Straits Asia Resources:

Objectives of this Presentation:

 CCOW awarded 1994

 35km from north to south,

0 100 Resources and Reserves

 Significant NE-SW oriented

Bypass – High Ash

Bypass – Low Ash

Settling Pond and Liming

Sump and Pumps

Constraints that determine mining and dumping strategy:

Mud cells constructed well back from

Strip Z Strip Y Strip X Mud Cell

Toe of dump offset from mine face

Wash Plant BP Crusher

 Surpac Vision used for geological modeling*,

Seam DTMs, mining limits. 1. Pit Design Surpac

Waste mining equipment

Coal mining equipment

Wash plant capacity, yield. 5. Coal Wash and Production Spreadsheet

Topography, dump slopes,

Swell, haulage profiles. 7. Material Balance Spreadsheet

Disadvantages of Spreadsheet System:

Advantages of Spreadsheet System:

1. Pit Design Surpac

4. Schedule Coal Mining Spreadsheet

5. Coal Wash and Production Spreadsheet

6. Ramp and Dump Design Surpac

7. Material Balance Spreadsheet

1. Reports: - Coal Exposed Schedule (+qualities)

1. Pit Design Surpac

2. Schedule Waste Mining MineSched (ROM Model)

3. Schedule Coal Mining MineSched

5. Ramp and Dump Design Surpac

6. Material Balance MineSched 2. Material Balance

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