12 February 2020
20137096-009 Rev A
suppliers and Golders past experience. The estimates Class 4 costs for all the raises are summarised in Table 6 with detailed costing provided in APPENDIX D.
Table 6: Provisional Costing Summary (Class 4)
Option 1 Clay Amount (AUD)
Option 2 HDPE Amount (AUD)
No.
Description
1.
-
13,524,862 Note 1
Stage 1 - Starter embankment to RL 290 m
2.
5,083,800
Stage 2 to RL 300 m
5,533,050
3.
5,090,200
Stage 3 to RL 310 m
5,625,700
4.
5,245,430
Stage 4 to RL 320 m
5,848,930
5.
5,791,646
Stage 5 to RL 330 m
6,445,146
6.
4,732,092
Stage 6 to RL 335 m
5,260,692
Direct Costs – Stage 2 to 6
28,713,518
25,943,168
Project Estimate – Stage 1 to 6
64,850,275
59,898,275
Note 1: includes – Direct costs, Contractor, Owners cost, Base estimate and Project contingency
11.0 WAY FORWARD
The following at least will need to be done going forward with this design.
Geotechnical investigation of the embankment footprint
Sample and testing of waste rock for downstream shell
▪
Geochemical
▪
Geotechnical
Sourcing and testing of
▪
Clays and soils for seal zone
▪
Gravel for filter drain
Water balance modelling.
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