2.1.2. Proposed Amendment 2: Update Table A1 and Figure 1 to address TBDs and reduce
duplication
This amendment proposes to update the mining lease and location columns in Table A1 for the Pipe
Corridor and Surface Exploration mine features which currently state “TBD, to be provided by 30 June
2025”.
Pipe Corridor
The pipe corridor connects the process plant to the Sandstone Gully TSF and is designed to transfer
tailings in slurry form for permanent deposition. It is understood that at the time of EA issue to Heritage
Minerals in 2022, the mine plan was evolving and some details could not be provided to the
administering authority for inclusion in the EA. Pipe corridor design has now been completed as shown
in Figure 6.
The maximum disturbance area of the pipe corridor is 1.17 ha which is within the maximum disturbance
limit of 3ha specified in Table A1. This newly created pipe corridor disturbance area has been included
as a polygon within the Schedule 1, Figure 1 of the EA as indicated in Figure 7 of this document. The
pipe design layout is based on concept engineering.
2.1.3. Proposed Amendment 3: Fix Minor Erroneous Issues in the EA
The amendment proposes to modify Table H2 – Details of Regulated Structures of the EA to correct an
erroneous value.
Table H2 currently authorises a maximum volume of 11,52,416 m 3 of tailings to be disposed in the Sandstone Gully TSF. The Sandstone Gully TSF Report prepared by WSP (issued 12 February 2020) provided a maximum cumulative storage capacity of 11,532,416m 3 associated with tailings deposited
to RL 319m. An extract of the relevant section from the TSF report is provided in Figure 5. Sandstone
Gully TSF Storage Capacity (Golder, 2020), whilst a copy of the report in its entirety is provided in
Appendix B.
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Wulguru Technical Services Pty Ltd – Supporting Information Report
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