12 February 2020
20137096-009 Rev A
Parameter
Design Input
Reference
Acceptable Embankment Factors of Safety
Table 2
Drained Undrained Post-seismic
1.5 1.5 (Global) and 1.3 (Local) 1.0 – 1.1
ANCOLD 2012
Water Management
Catchment area to RL 335 m
114 Ha
APPENDIX A
Size of normal operating pond
10% of operating area
Practice
Minimum operational (tailings) freeboard
1 m below crest level
Golder
To be determined as part of the design studies
Golder assessment
Design rainfall
Water Balance – Design Parameters
BOM station
Average annual rainfall
TBC
Surface Water Management
Consistent with other site infrastructure
Stormwater diversion drains
TBC
Seepage Management
Water retaining portion of TSF embankments lined with low permeability waste material or geomembrane liner
Liner requirement
Golder
Finger blanket underneath TSF embankment, and seepage collection trenches located along the outer embankment toe-line
Seepage drainage
Golder
Embankment zoning and provision of high seepage discharge chimney
Internal drainage
Golder
TBC and to be dependent on the water level from the PIT
Depth to original groundwater
Seepage Management
Water retaining portion of TSF embankments lined with low permeability waste material or geomembrane liner
Liner requirement
Golder
8
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