Mount Morgan Mine Upper Mundic Gully TSF EA Amendment

Abbreviations

DETSI

Department of Environment, Tourist, Science and Innovation

DSA

Design Storage Allowance

EA

Environmental Authority

ESS

Emergency Storm Storage

FMA

Failure Modes Analysis

Heritage

Heritage Minerals

LOF

life-of-facility

LOM

Lif-of-Mine

m 3

Cubic meter

Mm 3

Millions cubic meter

Mt

Million tonnes

NAPP

Net Acid Producing Potential

OCP

Open Cut Pit

OMS

Operations, Maintenance and Surveillance Manual

PMF

Probable Maximum Flood

PMP

Probable Maximum Precipitation

PRCP

Progressive Rehabilitation and Closure Plan

SSG

Sandstone Gully

TARP

Trigger Action Response Plan

t

tonne

TMP

Tailings Management Plan

TSF

Tailings Storage Facility

UMG

Upper Mundic Gully

Project No PS213278 Upper Mundic Gully - Tailings Management Plan Mount Morgan Gold Mine Heritage Minerals

WSP March 2026 Page iii

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