Mining Planning Conference Mining Planning Conference.ppt

Mining Planning Conference

1. Anglo Base Metals1
EL SOLDADO
Mine Planning Conference
November 2009

2. Anglo Base Metals2
Agenda
EL SOLDADO OVERVIEW
UNDER GROUND MINE PLANNING SYSTEM
OPEN PIT MINE PLANNING SYSTEM
LOM 2009 MINE DESIGNED

3. Anglo Base Metals3
El Soldado Location

4. Anglo Base Metals4
Geological Setting
Geological Setting of
El Soldado
•StratigraphicControl:
Cu mines in Lo PradoFm
•Structural Control:
shear faults
•El Soldadois two orders
of magnitude larger than
other mines
Reserves: 115 mton
0.96% CuT
Resources: 149 mton
0.68% CuT
•Distal location of El
Soldadowith respect to
the Batholith
Geological Setting of
El Soldado
•StratigraphicControl:
Cu mines in Lo PradoFm
•Structural Control:
shear faults
•El Soldadois two orders
of magnitude larger than
other mines
Reserves: 115 mton
0.96% CuT
Resources: 149 mton
0.68% CuT
•Distal location of El
Soldadowith respect to
the Batholith
•Stratigraphic Control: Copper
Mines in Lo prado Formation
•Structural Control: Faults and
fractures
•El Soldado is two orders of
magnitude larger than others
mines in the district.
Reserves: 105 mton @ 0.58% Cu
Resources: 149 mton @ 0.68% Cu
•Distal location of El
Soldado respect to the
Batholith

5. Anglo Base Metals5
Geological Cross Section

6. Anglo Base Metals6
El Soldado Flow Sheet
System Bottleneck
SX/EW
Espesamiento/Filtrado

7. Anglo Base Metals7
MINING ENGINEERING ORGANIZATIONAL STRUCTURE

8. Anglo Base Metals8
•Underground Design
•Geomechanics
•Underground Mine Planning
•Underground Opportunities (Chuquenes)
El Soldado Underground
•Underground Mining Method

9. Anglo Base Metals9
Underground Mining Method
Drilling Level
Extraction Drifts
Undercut Level

10. Anglo Base Metals10
•Underground Mining Method
•Geomechanics
•Underground Mine Planning
•Underground Opportunities (Chuquenes)
•Underground Design
EL SOLDADO UNDERGROUND

11. Anglo Base Metals11
Detail
Stope Design
Basic
Stope Design
Underground Design
Inputs
• Geology
• Block Model
• Cavities Model
•
Geomechanical
Model
• Nearby
infrastructure
• Design
standards
• Mine Services
• Cost Model
Conceptual
Stope Design
Construction:
Drifts and ramps
Production drilling
Design Flow Chart
Infill
drilling
Block
Model &
Geology
Update
Reviews &
Approvals
Follow up:
Topography
Geological
mapping
Geomechanics
Grade control

12. Anglo Base Metals12
•Underground Mining Method
•Underground Design
•Underground Mine Planning
•Underground Opportunities (Chuquenes)
El Soldado Underground
•Geomechanics
Geomechanics

13. Anglo Base Metals13
Geomechanics
•Structural and potential caving analysis
•Mining sequence
•Support design
•Instrumentation
•Guidelines for accessing and developing
•Blasting sequence
•Numerical analysis (only under complex geometries)
UNDERGROUND DESIGN
METHODOLOGY

14. Anglo Base Metals14
Geomechanics
COTA 790
1400 1400
E


5
0
0
E

1
0
0
0
CAVITY
SANTA CLARA
ARAUCO
CAVITY
RESERVES SURROUNDING
STA. CLARA CAVITY
UPPER ARAUCO
CAVITY RESERVES
WEST WALL
RESERVES
NON SURFACE
IMPACT RESERVES
HANGING WALL RESERVES
CALIFORNIA FAULT
E

1
0
0
0
YEAR 2008
YEAR 2012
12001200
1000 1000
800 800
600
F1
F2
F3
NON RESTRICTED RESERVES
RESTRICTED RESERVES
COMPLEX MINING CONDITIONS RESERVES
OPEN PIT EXTRACTED RESERVES

15. Anglo Base Metals15
•Underground Mining Method
•Underground Design
•Geomechanics
•Underground Opportunities (Chuquenes)
•Underground Mine Planning
Underground Mine Planning

16. Anglo Base Metals16
Underground Mine Planning
Mine
Plan
Long Term Mine
Plan
1.Mineable Reserves.
2.Exploitation sequence
3.Access design
4.Reserve development
Mill Treatment
Capacity
Mine Operations Level
1.Ore extraction
2.Headings
3.Drilling & Blasting
4.Mine services
Mine Equipment
1.Operational Indexes
Geomechanics
1.Mining sequence.
2.Blasting sequence.
3.Reinforcement
4.Instrumentation &
monitoring
Design Standards
1.Drilling Patterns
2.Stope geometry.
3.Drift drilling & blasting
4.Advance per blast
5.Over extraction
Topography
1.Broken ore (ton –
grade)
2.Drilled reserves (ton –
grade)
3.Drifts and raises
Approved Investments
1.Project developments
2.Mine equipment:
replacement or increase
3.Infrastructure
Grade Model
1.DTH grades
2.Block Model
3.Drill hole program.
Approved Permits
1.- Waste dumps

17. Anglo Base Metals17
•Underground Mining Method
•Underground Design
•Geomechanics
•Underground Mine Planning
El Soldado Underground
•Underground Opportunities (Chuquenes)
Underground Opportunities (Chuquenes)

18. Anglo Base Metals18
Underground Opportunities (Chuquenes)
•Potential resources: 56 Mt Potential resources: 56 Mt
@ 0,64% CuT.@ 0,64% CuT.

19. Anglo Base Metals19
EL SOLDADO OPEN PIT PLANNING PROCCES
March
April
June
Scheduling using
Comet and final Lom 1
Report with new
mining strategic.
May
Use of Whittle, to
generate final pit
and pushbacks

20. Anglo Base Metals20
Botadero El Sauce
Botadero El Carmen
Portezuelo
Veta Blanca
LOM May 2004, página 46
PRIOR EL SOLDADO MINING STRATEGY
Morro
Phase I, II,II

21. Anglo Base Metals21
LOM May 2004, página 33
PRIOR EL SOLDADO MINE DESIGN PRIOR EL SOLDADO MINE DESIGN
W
F A
L
L
A
C
A
L I F O
R
N
I A
Phase 2
Phase 1
Phase 3
E

22. Anglo Base Metals22
LOM May 2004, página 32
Pre-stripping
Fase 2
Fase 1
Fase 3
PRIOR EL SOLDADO MINE DESIGNPRIOR EL SOLDADO MINE DESIGN

23. Anglo Base Metals23
Interference Phase I - II

24. Anglo Base Metals24
1. Generar camellon de
Seguridad por 990
2. Perforar solo luz día.
3. Tronar y levantar material
del disparo 960-30
4. Levantar material bajo Falla
Plana. Supervisión geomecánica
5. Levantamiento topográfico de Pata de zona
de relleno Santa Clara y de Falla Plana (cota
960)
6. Se indicará nuevo diseño. Se dejará
berma en extremo norte del disparo 950-
27
Z
o
n
a
d
e
R
e
lle
n
o
S
a
n
ta
C
la
ra
Á
re
a
d
e
F
a
lla
P
la
n
a
950-27
950-27
Interference Phase I - II

25. Anglo Base Metals25
CURRENT EL SOLDADO MINING STRATEGIC

26. Anglo Base Metals26
LOM209 – Terms of Reference1
GEOLOGYGEOLOGY LOM 2 2009LOM 2 2009
GEOLOGICAL
Resources model - Cu grade : Model 2009
- Recovery : Modelo
2009
Selectivity / dilution
factors
- Veta Blanca : 5% less
in Cu grade
- Filo : 5% less in Cu
grade

27. Anglo Base Metals27
LOM209 – Terms of Reference1
PIT OPTIMISATION & PIT OPTIMISATION &
MINE DESIGNMINE DESIGN
LOM 2 2009LOM 2 2009
TOPOGRAPHY - OUTLOOK 8+4
INTERRAMP SLOPE ANGLE

- Filo/VB : Loose material (caving/backfill) :
38°
- Filo : Range : 47°/ 55° (face angle 70°)
- VB : Range : 47°/ 50° (face angle 65-70°)
MINE DESIGN - Mine design parameters
- Phase/Bench access into pushback design
PUSHBACK SEQUENCE
Final Pit (Reserves)
Final Pit (Resourses)
Pushbacks

- Long Term Price : 1.70 US$/lb cu
- LTP : 1,7 x 1.4 = 2.4 US$/lb cu
-Filo(3) : F2, F3,F 4 y F5 and VB(2) : VBI,
-VBF

28. Anglo Base Metals28
LOM209 – Terms of Reference2
OPERATIONOPERATION LOM 2 2009LOM 2 2009
OP MINE
- Operating/Off days (fog days)
- Ore transportation system (Mine to Plant)
- Max vertical distance between phases
- Max rock movement per phase
- Days : 335 / 30
- Mine trucks (250 ST)
- 150 m
- 36 MTPY
UG MINE
- Underground mine closure

- End of 2010 – reopening post
2020
WASTE DUMP
- El Carmen
- El Sauce
- Capacity : 454 Mton
- Capacity : El Belloto restriction

29. Anglo Base Metals29
LOM209 BASE CASE 4
Base Case:
–Mine development is mandatory to achieve pre-stripping in phases Veta Blanca
and Filo. New plan consider
•Operational and geotechnical restriction
•Hydraulic Shovels main operation
•Increase use of availability

30. Anglo Base Metals30
USE OF COMET OPTIMIZER
0
20
40
60
80
100
120
0. 090. 100. 110. 130. 150. 200. 400. 650. 7 50. 800. 850. 90
Le ye s de C or te (C uT %)
T
o
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e
l
a
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e

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1
0
20
40
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100
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0. 090 .1 00. 110. 130. 150. 200. 400. 650. 750. 8 00. 850. 90
L ey e s de Co rte (C uT %)
T
o
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l
a
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e

(
t
)
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0 . 1
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1
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2 0
4 0
6 0
8 0
100
120
0. 090. 100. 110. 130. 150. 200 .4 00. 650. 7 50. 800. 850. 90
Le ye s de C o rt e (C uT %)
T
o
n
e
l
a
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e

(
t
)
0
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1
0
20
40
60
80
10 0
12 0
0. 090. 100. 110. 130. 150. 200. 400. 650. 750. 800. 850. 9 0
L e ye s d e Co rt e ( Cu T %)
T
o
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e
l
a
j
e

(
t
)
0
0. 1
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1
B1
F1
B2
0
20
40
60
80
100
120
0. 090. 100. 110. 130. 150. 200. 400. 650. 7 50. 800. 850. 90
Le ye s de C or te (C uT %)
T
o
n
e
l
a
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e

(
t
)
0
0. 1
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1
0
20
40
60
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100
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0. 090 .1 00. 110. 130. 150. 200. 400. 650. 750. 8 00. 850. 90
L ey e s de Co rte (C uT %)
T
o
n
e
l
a
j
e

(
t
)
0
0 . 1
0 . 2
0 . 3
0 . 4
0 . 5
0 . 6
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0 . 9
1
0
2 0
4 0
6 0
8 0
100
120
0. 090. 100. 110. 130. 150. 200 .4 00. 650. 7 50. 800. 850. 90
Le ye s de C o rt e (C uT %)
T
o
n
e
l
a
j
e

(
t
)
0
0. 1
0. 2
0. 3
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1
0
20
40
60
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10 0
12 0
0. 090. 100. 110. 130. 150. 200. 400. 650. 750. 800. 850. 9 0
L e ye s d e Co rt e ( Cu T %)
T
o
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e
l
a
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e

(
t
)
0
0. 1
0. 2
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0. 4
0. 5
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1
F2 F3 F4
B3
0
20
40
60
80
100
120
0. 090. 100. 110. 130. 150. 200. 400. 650. 7 50. 800. 850. 90
Le ye s de C or te (C uT %)
T
o
n
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l
a
j
e

(
t
)
0
0. 1
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1
0
20
40
60
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100
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0. 090 .1 00. 110. 130. 150. 200. 400. 650. 750. 8 00. 850. 90
L ey e s de Co rte (C uT %)
T
o
n
e
l
a
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e

(
t
)
0
0 . 1
0 . 2
0 . 3
0 . 4
0 . 5
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0 . 8
0 . 9
1
0
2 0
4 0
6 0
8 0
100
120
0. 090. 100. 110. 130. 150. 200 .4 00. 650. 7 50. 800. 850. 90
Le ye s de C o rt e (C uT %)
T
o
n
e
l
a
j
e

(
t
)
0
0. 1
0. 2
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1
0
20
40
60
80
10 0
12 0
0. 090. 100. 110. 130. 150. 200. 400. 650. 750. 800. 850. 9 0
L e ye s d e Co rt e ( Cu T %)
T
o
n
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l
a
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(
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)
0
0. 1
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1
USING TONNAGE – GRADE CURVE PER PUSHPACK
OPTIMIZATION
•Analysis of cut off grades with lane by Pushbacks
and Benches into operative sequences
•Mix between benches and stocks.
•Creation of practical and realistic long term plans
(utilizing comprehensive constraints within defined
time periods). Ex (sinking rates).
0.4
0.45
0.5
0.55
0.6
0.65
0.7
0.75
0.8
1 2 3 4 5 6 7 8
P ERI ODO
C
U
T

(
%
)
Is it possible to
meet this strategic
with so many
constrains
PRODUCTION PLAN
OPTIMIZED
0
20
40
60
80
1 00
1 20
1 40
1 60
1 80
1 2 3 4 5 6 7 8
Optimal NPV

31. Anglo Base Metals31
CURRENT PLAN PRODUCTION EL SOLDADO
MOV TOTAL [ kton ] 201020112012201320142015201620172018201920202021202220232024202520262027Total
Fase 1 1,072 - - - - - - - - - - - - - - - - - 1,072
Fase 2 27,342 29,285 36,000 9,993 24,837 4,744 2,891 2,651 - - - - - - - - - - 137,743
Fase 3 - 25,000 36,000 35,999 26,673 23,123 16,876 10,240 13,345 9,503 5,648 3,061 - - - - - - 205,468
Fase 4 - - - - - - - - - - - 4,153 8,214 12,123 11,573 16,361 6,217 - 58,640
Fase 5 - 2,200 5,600 14,739 10,000 1,048 5,680 13,685 11,740 14,585 18,374 6,865 6,864 7,047 6,132 2,130 1,074 - 127,767
Fase VBI - - 400 582 - - - - - - - - - - - - - - 982
Fase VBF 30,117 17,495 - 12,283 - - - - - - - - - - - - - - 59,895
OPIT kt seco 58,531 73,980 78,000 73,597 61,510 28,915 25,447 26,577 25,085 24,088 24,022 14,079 15,078 19,170 17,706 18,491 7,291 - 591,567
Stockpile HG - - - - - - - - - 1,450 - 860 - - - - - - 2,310
Stockpile LG - - - - - - - - - - - - - - - - 2,105 6,695 8,800
Stock existente 5,194 408 - - - - - - - - - - - - - - - - 5,602
STOCK (REMANEJO) kt seco 5,194 408 - - - - - - - 1,450 - 860 - - - - 2,105 6,695 16,712
Subterránea 1,103 - - - - - - - - - 2,000 2,000 2,000 2,000 2,000 2,000 2,000 1,000 16,103
UG kt seco 1,103 - - - - - - - - - 2,000 2,000 2,000 2,000 2,000 2,000 2,000 1,000 16,103
MOV TOTAL OPIT kt hum 65,63776,61980,34075,80563,35629,78226,21127,37425,83726,30424,74315,38715,53119,74518,23719,0469,6786,896626,527
Copper Production

32. Anglo Base Metals32
OPEN PIT OPPORTUNITIES
Cost reduction / Increase production:
•Improve slope angle in Filo phase
•Obtain Belloto tree management agreement
•Achieve higher rock movement per phases, productivity and unit costs
Development of others resources:
•Cat IV/infill, incorporate inferred resources (Veta Blanca, Phase 2)
•Cat III, drill campaign in no recognized sectors (Chuquenes and Other)

33. Anglo Base Metals
33
BACKUPBACKUP

34. Anglo Base Metals
34
ORE PASS 56

35. Anglo Base Metals
35
Mine to Plant Road
Planta de Oxidos
Chancador Portezuelo
Nivel-100
Fase 2
Nivel-300
Camino Mina-Planta
Tranex

36. Anglo Base Metals36
Sulfide Plant

37. Anglo Base Metals37
Sulfide Plant
Flowchart
Primary
Crusher
42” x 65”
SY II
SY III
Crusher 5.1/2” STD
(2)Crusher 7” SH
(5) Ball Mill
9 1/2’ x 12’
45.000 t
SAG
34’x17’
(4) RodMill
8’x12’
(2) RodMill
8 y 9 1/2 x 12’
(1) Ball Mill 12 1 / 2’ x 27
Filter 125/150m
2
Thickener (“)
20m Diam.
Thickener 1)
12m Diam.
Tailings
DAM
15.000 t

38. Anglo Base Metals38
Sulfide Plant
Parameters
•Treatment 6460 kt/y
–Primary Crusher Capacity 1400 t/h
–Secondary / Tertiary Crusher Capacity 340 t/h
–SAG Mill Capacity 520 t/h
–Conventional Mill Capacity 300 t/h
•Average Grade 0.79 % Cu
•Met. Recovery 75%
•Concentrate Grade 28.1 % Cu
•Total Fine Copper 40 kt

39. Anglo Base Metals39
Cathode Plant

40. Anglo Base Metals40
Crushing
SY-III
SY-II
Stock N°1Stock N°2
Primary Jaw
Crushing
Ripios
Extraction
2 Stages
Stripping
2 Stages
Organic
Electrowininng
Electrolyte
Tails to
Dam
Cathode
Pregnant Leaching SolutionPLS
Copper
Cathode
99.99% Cu
Agglomeration
Reffinate
Agglomerator
Leaching
ILS
Screen
Solvent Extraction
Cathode Plant
Flowchart

41. Anglo Base Metals41
2009 block model building
• Ore areas drilled in E-W vertical sections every 25 m in OP and every 12.5 m
in UG
• During last drilling campaign 37,381 m were drilled and incorporated into the
model (24,843 DDH and 12,538 RCH) from which 3 m sample size were
obtained
• Original 3.125 x 3.125 x 5 m blocks are used, blocks are redefined to 6.25 x
6.25 x 10 m, to be used in Pit planning and incorporate boundary mineralised
waste
• 4 estimation areas defined: N, S, Central-W and Central-E at both sides of
California fault. Mineral resources are defined as having a 50% minimum
probability of having grades equal or greater that 0.25% Total Cu
• Due to the significant structural control of ES mine, grades and recoveries are
estimated by krieging, taking into account a 3D location of faults controlling
mineralization
• A geo-statistical method is used for open pit resource classification and
distance / number of samples from each block is used in underground mine
• Sampling QA/QC control is performed through the use of standards, blanks,
blind duplicates and round robins
• Model estimate is validated by
• section comparison of grades from drilling and blocks
• drilling grade estimate compared with actual ones from the exploited areas
(blasting samples)
3D resource estimation
controlled by structural
trend
Structure
Search
ellipsoid
9

42. Anglo Base Metals
42
Recovery – Model 2009
•Metallurgical samples in 2008 for recovery estimation were 450. In 2009
update, the number of samples shows an important increment, with a
total of 1001 samples available for the estimation.
• The metallurgical recovery of ore filling Santa Clara and California
caving was estimated as 75% using the current samples average
recovery. In prior years, this recovery was estimated as 81%, using the
background values.
• In Filo pit new metallurgical test were carry out in order to find out the
differences in recovery between old (before 2006, D80=150) and new
(D80=190, current plant set up). The results show that a correction of -
3% should be used for the areas estimated with old samples. In 2008 this
correction was of 1.2%.
•Metallurgical Recovery for the stock is 65%. This value was estimated
considering the stocks low grade and the minimum value of background
recovery.

43. Anglo Base Metals
43
BLOCK MODEL
FINAL PIT LOM2 2009 : MODELO LP 2008 10m
Topografía fin 2009 proyectada en Sep 09 de Fase 2 y Veta Blanca
FASE kts %CuT %Rec ktCuf
Fase 02 22,476 0.92 80.8 167
Fase 03 49,982 1.00 83.0 415
Fase 04 9,837 0.95 83.3 78
Fase 05 20,633 1.01 82.3 172
Veta B.P. 8,814 0.82 70.7 51
Veta B.F. 2,531 0.85 75.9 16
Total 114,273 0.97 81.5 899
Dilución plan (3%) 3,428 -0.03 0
Total 117,701 0.94 81.5 898
FINAL PIT LOM2 2009 : MODELO LP 2009 10m
Topografía fin 2009 proyectada en Sep 09 de Fase 2 y Veta Blanca
FASE kts %CuT %Rec ktCuf
Fase 02 23,159 0.89 75.8 156
Fase 03 50,242 0.95 79.5 377
Fase 04 10,818 0.77 81.8 68
Fase 05 21,927 0.96 79.2 166
Veta B.P. 9,550 0.78 69.5 52
Veta B.F. 2,513 0.83 67.1 14
Total 118,209 0.91 77.9 835
Dilución plan (5%) 5,910 -0.05 0
Total 124,119 0.86 77.9 832
DELTA
sin dilución 3,936 -6.2% -4.4% -7.2%
con dilución 2,482 -8.1% -4.4% -7.3%
Kton por tonpor leypor recTOTAL
por ton 31 31
por ley -57 -57
por rec -38 -38
TOTAL 31 -57 -38 -65
dilution -15 -79
VARIACION Cuf

44. Anglo Base Metals44
YEAR END 2009 – OL 8+4YEAR END 2009 – OL 8+4

45. Anglo Base Metals45
GEOTECHNICAL BASES
VETA BLANCAVETA BLANCA
–Parameters from Morro Pit which has similar structural domains
as Veta Blanca.
A. IR: 47°
A. Cara Banco: 65°
Bco. Doble 20 m
A. IR.: 50°
A. Cara Banco: 70°
Bco. Doble 20 m
A. IR.: 50°
A. Cara Banco: 70°
Bco. Doble 20 m
Veta Blanca
A. IR: 47°
A. Cara Banco: 65°
Bco. Doble 20 m
A. IR.: 50°
A. Cara Banco: 70°
Bco. Doble 20 m
A. IR.: 50°
A. Cara Banco: 70°
Bco. Doble 20 m
Veta Blanca
A. IR.: 50°
A. C. B.: 70°
Bco. Simple 15 m
A. IR.: 47°
A. C. B.: 70°
Bco. Doble: 20 m
A. IR.: 50°
A. C. B. : 70°
Bco. Doble: 20 m
A. IR.: 50°
A. C. B.: 70°
Bco. Simple 15 m
A. IR.: 50°
A. C. B.: 70°
Bco. Doble: 20 m
A. IR.: 47°
A. C. B.: 70°
Bco. Doble: 20 m
TopografíaFinal MorroW
Elevación: 1040
A. Sector en relleno
38°
TopografíaFinal Fase02
FallaCalifornia
A. IR.: 50°
A. C. B.: 70°
Bco. Simple 15 m
A. IR.: 47°
A. C. B.: 70°
Bco. Doble: 20 m
A. IR.: 50°
A. C. B. : 70°
Bco. Doble: 20 m
A. IR.: 50°
A. C. B.: 70°
Bco. Simple 15 m
A. IR.: 50°
A. C. B.: 70°
Bco. Doble: 20 m
A. IR.: 47°
A. C. B.: 70°
Bco. Doble: 20 m
TopografíaFinal MorroW
Elevación: 1040
A. Sector en relleno
38°
TopografíaFinal Fase02
FallaCalifornia
FILOFILO
–Extended Pit Geotechnical study (EMT)
–Geometrical parameters. Ritchie approach
–Max vertical distance between phases (150m)
–Minimum horizontal distance between Phase
2 and California fault (60m)
–Minimum horizontal distance between Phase
3 and California fault (20m)

46. Anglo Base Metals46
Fase2
940
Fase1
840
Fase3
1200
Fase4
1220
Catch berm30m
Catch berm30m
Catch berm30m
260 m
TopoFinal 2008 Elev. 1310
Fase2
940
Fase1
840
Fase3
1200
Fase4
1220
Catch berm30m
Catch berm30m
Catch berm30m
260 m
TopoFinal 2008 Elev. 1310
OPEN PIT PUSHBACK DESIGN

47. Anglo Base Metals47
PIT DESIGN
Working bench height m 10 - 15
Final Double Benching m 20
Haul Roads Width m 30
Haul Roads Grade % 10
Bench face angle m 65° - 70°
Interramp angle m 47° - 50°
Bench width m 5 - 9
Phase lag * m 310
( * ) : geothecnical analisys
Design restriction California fault
West m 60
East m 20
PIT DESIGN PARAMETERSPIT DESIGN PARAMETERS

b
BENCH
HEIGHT
h
b
INTERRAMP
ANGLE

r
INTERRAMP
HEIGHT
h
r
OVERALL
ANGLE

o
OVERALL
HEIGHT
h
o
RAMP WIDTH
b
r
BERM
WIDTH
b
INTERRAMP
ANGLE

r
BENCH FACE
INCLINATION
b
BENCH
HEIGHT
h
b
INTERRAMP
ANGLE

r
INTERRAMP
HEIGHT
h
r
OVERALL
ANGLE

o
OVERALL
HEIGHT
h
o
RAMP WIDTH
b
r
BERM
WIDTH
b
INTERRAMP
ANGLE

r
BENCH FACE
INCLINATION
38° - 47° / 55°
20 (ore) – 30
(waste)
5 - 17

48. Anglo Base Metals48
PIT OPTIMISATION PARAMETERSPIT OPTIMISATION PARAMETERS
A. IR: 47°
A. Cara Banco: 65°
Bco. Doble 20 m
A. IR.: 50°
A. Cara Banco: 70°
Bco. Doble 20 m
A. IR.: 50°
A. Cara Banco: 70°
Bco. Doble 20 m
Veta Blanca
A. IR: 47°
A. Cara Banco: 65°
Bco. Doble 20 m
A. IR.: 50°
A. Cara Banco: 70°
Bco. Doble 20 m
A. IR.: 50°
A. Cara Banco: 70°
Bco. Doble 20 m
Veta Blanca
A. IR.: 50°
A. C. B.: 70°
Bco. Simple 15 m
A. IR.: 47°
A. C. B.: 70°
Bco. Doble: 20 m
A. IR.: 50°
A. C. B. : 70°
Bco. Doble: 20 m
A. IR.: 50°
A. C. B.: 70°
Bco. Simple 15 m
A. IR.: 50°
A. C. B.: 70°
Bco. Doble: 20 m
A. IR.: 47°
A. C. B.: 70°
Bco. Doble: 20 m
TopografíaFinal MorroW
Elevación: 1040
A. Sector en relleno
38°
TopografíaFinal Fase02
FallaCalifornia
A. IR.: 50°
A. C. B.: 70°
Bco. Simple 15 m
A. IR.: 47°
A. C. B.: 70°
Bco. Doble: 20 m
A. IR.: 50°
A. C. B. : 70°
Bco. Doble: 20 m
A. IR.: 50°
A. C. B.: 70°
Bco. Simple 15 m
A. IR.: 50°
A. C. B.: 70°
Bco. Doble: 20 m
A. IR.: 47°
A. C. B.: 70°
Bco. Doble: 20 m
TopografíaFinal MorroW
Elevación: 1040
A. Sector en relleno
38°
TopografíaFinal Fase02
FallaCalifornia
NN
NN
PIT OPTIMISATION PARAMETERS
Software : Withlle 4X (Lerch-Grossmann)
REVENUE
Primary process Cu concentrate
Secondary process no
Long Term Copper Price US$/lb Cu 1.7
COSTS RDP 2009
MiningUS$/t 1.27 (w) - 1.57 (o)
ProcessUS$/t ore 6.1
TC/RCUS$/lb Cu
Inland/Ocean freightUS$/lb Cu
Other (SIB - G&A)US$/lb Cu
BLOCK MODEL
Variables (main) CuT-CuS-Rec-Conc-Dens
Size m 6.25 x 6.25 x 10
Reblocking x 2 x 2 x 1
UG Stopes
GEOTECHNICAL AREAS
Global slope angle range 38° - 45°
Interramp angle range 47° - 50°
Physical restrictions
(facilities & others) NO
0.29
47° - 52°

49. Anglo Base Metals49
FINAL PIT AND PHASE DESIGNFINAL PIT AND PHASE DESIGN
Fase4
Fase5
FallaCalifornia
Fase2
Fase3
FaseVBI
FaseVBF
PIT Precio1,7 US$/lb (Med + Ind)
(ángulos38°y 45°)
Fase4
Fase5
FallaCalifornia
Fase2
Fase3
FaseVBI
FaseVBF
PIT Precio1,7 US$/lb (Med + Ind)
(ángulos38°y 45°)
FINAL PITFINAL PIT
Sector Filo
Largo (m): 1500
Ancho (m): 300
Cota Base: 710
Sector Veta Blanca
Largo (m): 420
Ancho (m): 200
Cota Base: 935
NN

50. Anglo Base Metals50
LOM2 2009 : PHASE 23

51. Anglo Base Metals51
LOM 2 2009 : PHASE 33

52. Anglo Base Metals52
LOM 2 2009 : PHASE 43

53. Anglo Base Metals53
LOM 2 2009 : PHASE 5 (FINAL PIT)

54. Anglo Base Metals54
Tranque de Relaves
“El Torito”
Tranque de Relaves
N°4
Planta de
óxidos
Rajo Abierto
Planta de
súlfuros
Mina
Subterránea
Portezuelo
Depósito
El Carmen
Depósito
El Sauce
Veta Blanca
Yerbas Buenas
El Cobre
Morro
Belloto del Norte forest

55. Anglo Base Metals55

DUMP DESIGNS

56. Anglo Base Metals56
Veta Blanca Potential
Resources
N+1375N+1312.5 N+1325
Inferred resources:
•30 Mton ore of 0.63% CuT
•130 Kton Cu Fine

57. Anglo Base Metals57
Filo Potential Resources
Medido
Indicado
Inferido
Rajo
Central
Rajo Principal
Top
Act
Pit
Oper
Pit usd
1,15
Pit usd
1,80
Medido
Indicado
Inferido

58. Anglo Base Metals
58
•Growth opportunities
CAT III

59. Anglo Base Metals59
OPEN PIT MINING EQUIPMENT
OPEN PIT ROCK MINE PER YEAR
0
10000
20000
30000
40000
50000
60000
70000
80000
90000
2
0
0
3
2
0
0
4
2
0
0
5
2
0
0
6
2
0
0
7
2
0
0
8
2
0
0
9
2
0
1
0
2
0
1
1
2
0
1
2
2
0
1
3
2
0
1
4
2
0
1
5
2
0
1
6
2
0
1
7
2
0
1
8
2
0
1
9
YEAR
K
P
Y
KPY
Open Pit Ore Feeding per year
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
2
0
0
3
2
0
0
4
2
0
0
5
2
0
0
6
2
0
0
7
2
0
0
8
2
0
0
9
2
0
1
0
2
0
1
1
2
0
1
2
2
0
1
3
2
0
1
4
2
0
1
5
2
0
1
6
2
0
1
7
2
0
1
8
2
0
1
9
Year
K
P
Y
0.00
0.20
0.40
0.60
0.80
1.00
1.20
1.40
C
u
t

(
%
)
Ore (KPY)
Cut (%)
Mining Equipments
4 Front Loader CAT 994
3 Front Loaders L-1850
3 Komatsu Shovels PC-5500
6 Trucks Cat 785-B (150 tons)
18 Trucks Komatsu 830 (240 tons)
2 Drilling DMM-3 10 5/8”
3 Drilling D-75 10 5/8”
1 Drilling PV 10 5/8”

60. Anglo Base Metals60
UNDER GROUND ORE FEEDING PER YEAR
Under Ground Ore Feeding per year
0
500
1000
1500
2000
2500
3000
3500
2
0
0
3
2
0
0
4
2
0
0
5
2
0
0
6
2
0
0
7
2
0
0
8
2
0
0
9
2
0
1
0
2
0
1
1
2
0
1
2
2
0
1
3
2
0
1
4
2
0
1
5
2
0
1
6
2
0
1
7
2
0
1
8
2
0
1
9
Year
K
P
Y
0.000
0.200
0.400
0.600
0.800
1.000
1.200
1.400
C
u
t

(
%
)
Ore (KPY)
Cut (%)
Copper Production

61. Anglo Base Metals61

62. Anglo Base Metals62
GEOTECHNICAL REVIEW BOARD GEOTECHNICAL REVIEW BOARD
August 2009August 2009

EL SOLDADO DIVISIONEL SOLDADO DIVISION
OVERVIEWOVERVIEW

63. Anglo Base Metals63
Collahuasi
Mantos
Blancos
Mantoverde
El Soldado
Chagres
Los Bronces
Iquique
Antofagasta
Chañaral
Copiapó
La Calera
Valparaíso
Santiago
San Felipe
AA ChileAA Chile
ABMABM
44%

64. Anglo Base Metals64
EL SOLDADO DIVISIONEL SOLDADO DIVISION
AA CHILEAA CHILE
Location
- At 800 masl 130 km north of Santiago.
Products
- Cu in concentrate
- Cu cathode
Mine
- OPit & UG (SLS)
- Waste dump
Process (Sulphur and Oxide)
- SAG & Conventional grinding
- Concentrator plant
- Tailings dump
- Pad lix
- SX-EW plant
CHILECHILE
ARGENTINAARGENTINA

65. Anglo Base Metals65
1803 Written report on existing mining works
1889 Acquired by Mining Society of Catemu
1919 Transferred to Cia. Minera du M’Zaita (French)
1958 El Soldado integrated into Cía. Minera Disputada
1979-83 Concentrator Debottlenecking 3,3 to 5,5 kt/d, Investment $20M
1987 Expansion to 11.5 kt/d, Investment $65M
1989 Open Pit Start Up (2 kt/d) to support 14 kt/day, Investment $18M
1994 SX-EW Cathode Plant, Investment $ 14M
1996 Cathode Plant Expansion from 13.5 to 21.5 t/d, Investment $8M
1998-02 Plant Optimisation to 18 kt/d, Investment $ 7M
Nov ‘02 El Soldado integrated into Anglo American Chile
July ‘04 Extended Pit Project Approval
Jan ’07 Extended Pit Project Start up (Phase 2 mining)
HISTORYHISTORY

66. Anglo Base Metals66
INTEGRATED RISK MANAGEMENT (IRM)INTEGRATED RISK MANAGEMENT (IRM)
Anglo Base Metals Top 10 Strategic risks:

•Water build up in ore pass
•Slope stability failure. Pit failure / rock slideSlope stability failure. Pit failure / rock slide
•Rock falls in underground mineRock falls in underground mine
•Accident due to closure of UG mine
•Production loss due to grade, recovery and throughput over estimate
•Sulphate plume affecting potable water within 20 years
•Chemical burn caused by sulphuric acid
•Major electrical failure at mine substation
•Personnel transport : To and from work
•Critical conveyor belt fire at concentrator

67. Anglo Base Metals67
NPV reconciliation- US$m
BUSINESS NPV
BASE CASE LOM1 2009
• Price: higher copper price in this plan
• Controllable cost : Higher Plant process and G&A cost due to underestimation of costs on past LOM
• Non controllable: Mainly to higher TC/RC prices and consumables prices
• Other adjustment: Market to market adjustment during 2009 and other adjustments
$m El Soldado - LOM II 2008 vs. LOM I 2009
0.0
50.0
100.0
150.0
200.0
250.0
300.0
350.0
400.0
450.0
P
l
a
n
P
r
i
c
e
E
x
c
h
a
n
g
e
R
a
t
e
V
o
l
u
m
e
C
o
n
t
r
o
l
l
a
b
l
e
C
o
s
t
N
o
n
C
o
n
t
r
o
l
l
a
b
l
e
C
o
s
t
S
I
B

C
a
p
e
x
E
x
p
a
n
s
io
n
a
r
y
C
a
p
e
x
W
o
r
k
i
n
g
C
a
p
i
t
a
l
C
l
o
s
u
r
e
C
o
s
t
s
/

I
A
S
O
t
h
e
r

C
o
s
t
s
T
a
x
e
s
A
c
t
u
a
l
314.8 43.5 12.0 27.0 (39.0)(32.8) 7.2 (0.2) 10.2 5.8 (50.5)20.7 318.5
$
m

68. Anglo Base Metals68
Anglo Base Metals Top 10 Strategic risksAnglo Base Metals Top 10 Strategic risks
Risk Descriptions and Root Causes Post Control Rating Controls
C L RR
Water build up in ore pass
Root Causes:
•Excessive rain
•Excessive seepage
Potential Impacts:
• Multiple fatalities / legal penalties / brand damage
• Extended shutdown
3 4 18
•Inspection Galleries
•Remote control operation
•Drainage control through boreholes
•Intensify supervision until UG mine closure (2010)
•Ore pass operational protocol / procedures
Slope stability failure. Pit failure / rock
slide
Root Causes:
•Poor design: wall angle too steep
•Poor rock quality
•Excessive rain / seepage
•ineffective monitoring
•Poor operational control
•Major earthquake
Potential Impacts:
•Multiple fatalities / legal penalties / brand damage
•Extended shutdown
•Loss of listed assets
3 4 18
• Audited slope design and contour smooth blasting
• Routine slope control and geological mapping
• Slope monitoring using radar and surveying
• Computer wedge modelling – Rock fall modelling –
geotechnical recommendations
• On – line monitoring (dispatch)

69. Anglo Base Metals69
Risk Descriptions and Root Causes Post Control Rating Controls
C L RR
Rock falls in underground mine
Root Causes:
• Loose rock / poor roof support
• Inadequate standards
• Stress concentration
Potential Impacts:
•Multiple fatalities / legal penalties / brand damage
•UG mine production shutdown
3 4 18
• Routine UG checks, mapping and control
• UG monitoring with TDR and SISC systems
•Routine barrying. Reinforcement when needed, following
geotechnical recommendations
•Stope and infrastructure design following audited
methodology
Accident due to closure of UG mine
Root Causes:
•Demotivation
•Lack of training / high employee rotation

Potential Impacts:
•Single fatality
•UG mine production shutdown
•Contractor Strike
2 4 14
•Reinforce communications plan
•Training to key contractor personnel by Anglo Staff
•Monthly Safety recognition programme
•Review of UG mine organisation
Anglo Base Metals Top 10 Strategic risksAnglo Base Metals Top 10 Strategic risks