Original EA Amendment

PHASE 1: MONTH 0 - 11

INFLOWS

OUTFLOWS

1464 ML/period Dee River and Sludge

DOR WTP

1464 ML/period DOR WTP Transfer

0

1464 ML/period DOR WTP Transfer

726 ML/period

427 ML/ann

Seepage Pumpback

Enhanced Evaporation

276 ML/period

541 ML/period

Rainfall and Runoff

Natural Evaporation

OCP

446 ML/period Seepage Losses

-967

907 ML/period 0 ML/period SSG Pumped Transfer Evaporation Return

0 ML/period Enhanced Evaporation Losses

907 ML/period

0 ML/period

SSG Pumped Transfer

Enhanced Evaporation Througput

6 ML/Period

500 ML/period

Seepage Losses

SSGArea

Rainfall and Runoff 28 ML/period

36 ML/period

Basin 1&2 Spill

Natural Evaporation

-422

NET SYSTEM BALANCE:

-1389

Figure A.1

Simulated mean forecast water balance for Phase 1 (11 months of construction)

12624987 | Heritage Minerals EA Amendment Application – Updates to Water Balance Model July 2025 (Final) 12

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