Coffey Geosciences Pty Ltd ACN 056 335 516 Geotechnical l Resources l Environmental l Technical l Project Management Drawn Approved Date Scale DB RB 10 April 2006 As shown COMPASS RESOURCES NL BROWNS OXIDE PROJECT GROUNDWATER MODEL GROUNDWATER MODEL DEFINITION FIGURE 1 Job no: B18183/2-AC Whites Void Intermidiate Void Proposed Mine Site N 4000 m Bore location LEGEND: Scale NO FLOW BOUNDARY NO FLOW BOUNDARY CONSTANT HEAD BOUNDARY
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Coffey Geosciences Pty Ltd ACN 056 335 516 Geotechnical l Resources l Environmental l Technical l Project Management
Drawn
Approved
Date
Scale
DB
RB
10 April 2006
As shown
COMPASS RESOURCES NL BROWNS OXIDE PROJECT GROUNDWATER MODEL
GROUNDWATER MODEL DEFINITION
FIGURE 1
Job no: B18183/2-AC
Whites Void
Intermidiate Void
Proposed Mine Site
N
4000 m
Bore location
LEGEND:
Scale
NO FLOW BOUNDARY
NO FLOW BOUNDARY
CONSTANT HEAD BOUNDARY
Coffey Geosciences Pty Ltd ACN 056 335 516 Geotechnical l Resources l Environmental l Technical l Project Management
Drawn
Approved
Date
Scale
DB
RB
10 April 2006
As shown
COMPASS RESOURCES NL BROWNS OXIDE PROJECT GROUNDWATER MODEL
SURFACE CONTOURS
FIGURE 2
Job no: B18183/2-AC
N
4000 m
62
LEGEND:
Surface Level (mAHD)
Scale
Coffey Geosciences Pty Ltd ACN 056 335 516 Geotechnical l Resources l Environmental l Technical l Project Management
Drawn
Approved
Date
Scale
DB
RB
10 April 2006
COMPASS RESOURCES NL BROWNS OXIDE PROJECT GROUNDWATER MODEL
STEADY STATE GROUNDWATER LEVELS - CALIBRATION
FIGURE 3
Job no: B18183/2-AC
N Whites Void
Intermediate Void
Proposed Mine Site
4000 m
62
LEGEND:
Groundwater Level (mAHD)
Scale
Coffey Geosciences Pty Ltd ACN 056 335 516 Geotechnical l Resources l Environmental l Technical l Project Management
Drawn
Approved
Date
Scale
DB
RB
10 April 2006
COMPASS RESOURCES NL BROWNS OXIDE PROJECT GROUNDWATER MODEL
CALIBRATION COMPARISON
FIGURE 4
Job no: B18183/2-AC
56
57
58
59
60
61
62
63
56 57 58 59 60 61 62 63
Observed Head [m]
Co
mp
ute
d H
ead
[m
]
Feb-06 Mar-06 Apr 2006 May-06
Jun-06 Jul-06 Aug-06 Sep-06
Oct-06 Nov-06 Dec-06
Coffey Geosciences Pty Ltd ACN 056 335 516 Geotechnical l Resources l Environmental l Technical l Project Management
Drawn
Approved
Date
Scale
DB
RB
10 April 2006
COMPASS RESOURCES NL BROWNS OXIDE PROJECT GROUNDWATER MODEL
TEST PIT PUMPING, COMPUTED DRAWDOWN IN SEPTEMBER 2002, INITIAL TRIAL
FIGURE 5
Job no: B18183/2-AC
Limit of Whites Formation
N
500 m
0.75
Bore location
LEGEND:
Drawdown [m]
TPB 1
TPB 3
TPB 2
3137
Test Pit
3515
Coffey Geosciences Pty Ltd ACN 056 335 516 Geotechnical l Resources l Environmental l Technical l Project Management
Drawn
Approved
Date
Scale
DB
RB
10 April 2006
COMPASS RESOURCES NL BROWNS OXIDE PROJECT GROUNDWATER MODEL
TEST PIT PUMPING, DRAWDOWN IN SEPTEMBER 2002 (‘Impregnated Dolomite’: T= 40 m2/day)
FIGURE 6
Job no: B18183/2-AC
N
500 m
0.75
Bore location
LEGEND:
Drawdown [m]
TPB 1
TPB 3 TPB 2
3137
‘Impregnated Dolomite’ Kf = 40 m2/day
S = 0.01
Test Pit
3515
Coffey Geosciences Pty Ltd ACN 056 335 516 Geotechnical l Resources l Environmental l Technical l Project Management
Drawn
Approved
Date
Scale
DB
RB
12 April 2006
As shown
COMPASS RESOURCES NL BROWNS OXIDE PROJECT GROUNDWATER MODEL POSSIBLE PIT LAYOUT
FIGURE 7
Job no: B18183/2-AC
N
LEGEND:
Ground surface (mAHD)
RL45 Pit floor level (mAHD)
Coffey Geosciences Pty Ltd ACN 056 335 516 Geotechnical l Resources l Environmental l Technical l Project Management
Drawn
Approved
Date
Scale
DB
RB
12 April 2006
As shown
COMPASS RESOURCES NL BROWNS OXIDE PROJECT GROUNDWATER MODEL
MODELLED AVERAGE GROUNDWATER LEVELS (MINE OPERATES AT FULL DEPTH FROM THE OUTSET)
FIGURE 8
Job no: B18183/2-AC
N
500 m
34
Groundwater Flow
LEGEND:
Groundwater Level [mAHD]
East Finniss River
Browns Oxide Mine Intermediate Mine Void
Coffey Geosciences Pty Ltd ACN 056 335 516 Geotechnical l Resources l Environmental l Technical l Project Management
Drawn
Approved
Date
Scale
DB
RB
12 April 2006
As shown
COMPASS RESOURCES NL BROWNS OXIDE PROJECT GROUNDWATER MODEL
MODELLED FLOW RATES (MINE OPERATES AT FULL DEPTH FROM THE OUTSET)
FIGURE 9
Job no: B18183/2-AC
N
500 m
63 L/s
LEGEND:
Flow Rate ( -ve indicates flow reduction)
East Finniss River
Browns Oxide Mine
Intermediate Mine Void
1 L/s
3 L/s
0 L/s
12 L/s
163 L/s
63 L/s
20 L/s32 L/s Intermediate Pond:
-103 L/s
East Finness River: - 218 L/s
Proposed Browns Oxide Mine:294 L/s
1 L/s
3 L/s
0 L/s
12 L/s
163 L/s
63 L/s
20 L/s32 L/s Intermediate Pond:
-103 L/s
East Finness River: - 218 L/s
Proposed Browns Oxide Mine:294 L/s
2 4
2
6
8
10
2 4
2
6
8
10
Coffey Geosciences Pty Ltd ACN 056 335 516 Geotechnical l Resources l Environmental l Technical l Project Management
Drawn
Approved
Date
Scale
DB
RB
12 April 2006
As shown
COMPASS RESOURCES NL BROWNS OXIDE PROJECT GROUNDWATER MODEL
MODELLED AVERAGE DRAWDOWN (MINE OPERATES AT FULL DEPTH FROM THE OUTSET)
FIGURE 10
Job no: B18183/2-AC
N
2000 m
4
LEGEND:
Drawdown [m]
East Finniss River
Browns Oxide Mine Intermediate Mine Void
B18183/2-AC
13 April 2006
1
APPENDIX A
Mineralisation Study Results Provided By Compass Resources