Table 3.1
Summary of assumed maximum pump rates in the updated water balance modelling
GHD (2022a) Model - ML/d
July 2025 Update - ML/d
July 2025 Update - ℓ/s
SUBJECT
DOR WTP Discharge Flow Rate Phase 1 – Month 0 - 11: SSG being dewatered to OCP, OCP discharging via WTP.
1.5 (only for 3 months each year)
0 for month 1 and
11.57
Phase 2 – Month 12 - 51: OCP is the TSF. Phase 3 – Month 52 - 73: UMG is the TSF.
1.5 (only for 3 months each year)
4.8 after one month
55.55
1.5 (only for 3 months each year)
4.8
55.55
Phase 4 – Month 74 - onwards: UMG is the TSF.
1.5 (only for 3 months each year)
4.8
55.55
Return Water to Plant Phase 1: -
-
-
-
-
± 6.3 and 8.4 after 12 months
97.22
Phase 2: from OCP (Phase 2)
1.2
7.8
84.49
Phase 3: from UMG (Phase 3)
8.08
7.8
84.49
Phase 4: from UMG (Phase 4)
1.103
1.103
12.77
Phase 2 – 4: Ore moisture (Phase 2 - 4)
0.4
0.4
4.63
Phase 2 – 4: Dam 8
0.4
Other Pump Flow Rates
0.0
3.85
44.45
SSG to OCP (Phase 1) - Dewatering
0.0
0.5
5.79
OCP to UMG Transfer (Phase 3 and Phase 4)
1.2
Variable depending on sump
Variable depending on sump
Seepage Pump Back
12624987 | Heritage Minerals EA Amendment Application – Updates to Water Balance Model July 2025 (Final) 7
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