Original EA Amendment

4.3.1. Basis of Design

Design of the Upper Mundic Gully TSF has been undertaken by WSP and overseen by an RPEQ in

accordance with the following guidelines:

• DETSI Manual for assessing consequence categories and hydraulic performance of structures;

• DETSI Structures which are dams or levees construction as part of environmentally relevant

activities;

• ANCOLD Guidelines on Risk Assessment;

• ANCOLD Guideline on the Consequence Categories for Dams;

• ANCOLD Guideline on Tailings Dams Planning, Design, Construction, Operation and Closure;

• ANCOLD Guidelines or Design of Dams and Appurtenant Structures for Earthquakes; and

• Australian Rainfall and Runoff, A Guide to Flood Estimation.

The design criteria and basis of design values adopted for the Upper Mundic Gully TSF are provided in

Table 17.

Table 17. Design Criteria and basis of design

Description

Criteria

Units

Basis Value

Source

General

Existing ground combined

Design Survey

surface and provided pre

Heritage Minerals

mine combined surface

Survey system

MGA94 Zone 56

Heritage Minerals

Survey datum

Australian Height Datum

Heritage Minerals

Consequence

High B

WSP – Wattle Gully