4
Basis of design
The design criteria and basis of design values adopted for the conceptual design are presented in Table 4.1.
Table 4.1
Design criteria and basis of design
Description
Criteria
Units
Basis Value
Source
General
Design survey
-
-
Existing ground combined surface:
Heritage
A. Mount_Morgan_2007.dxf – site contours provided 13 April 2016 B. Mt_morgan_1604_e10.poi – April 2016 site LiDAR provided 6 May 2016
Pre mine combined surface:
A. Pre_mining_surf.dat
B. Premine_Topo_Robertson_ Geoconsultant.DXF
Survey system
-
-
MGA94 Zone 56
Heritage
Survey datum
-
-
Australian Height Datum
Heritage
Consequence Category
ANCOLD
-
High B
WSP – Upper Mundic Gully DBA and CCA Report [2]
TSF Embankment
Crest width
Light traffic
m
10
WSP
Batter slopes
Geotechnical requirements
H:V
2.5:1
WSP
Embankment
Mine spoil
-
Zoned with upstream liner
WSP
Tailings
Specific gravity of tailings
-
-
3.02
Heritage
Slurry solids content
-
% W/W
40
Heritage
Tailings average settled dry density
-
t/m³
1.10
WSP
Tailings beach slope
-
%
0.5
Heritage
Tailings storage requirement
-
Mt
Maximum feasible storage
Heritage
Water management
Minimum freeboard
-
m
1
WSP
Project No PS213278 Upper Mundic Gully TSF Concept Design to RL 390 m Mount Morgan Project Heritage Minerals
WSP October 2025 Page 5
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