Mount Morgan Mine Upper Mundic Gully TSF EA Amendment

Abbreviations

AHD

Australian Height Datum

BoM

Bureau of Meteorology

DNRME

Department of Natural Resources, Mines and Energy

EA

Environmental Authority

GDE

Groundwater‑Dependent Ecosystem

GIA

Groundwater Impact Assessment

GISTM

Global Industry Standard on Tailings Management

GWL

Groundwater Level

k

Hydraulic Conductivity

m/d

Metres per day

MAW

Mine‑Affected Water

ML

Mining Lease

QA/QC

Quality Assurance/Quality Control

SMP

Seepage Management Plan

TSF

Tailings Storage Facility

Project No PS213278 Mount Morgan Mine - Upper Mundic Gully TSF Seepage Management Plan Heritage Minerals

WSP May 2026 Page iii

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