Notice
Information request
construction of the UGM TSF it cannot be determined if this impacts the State acting through Department of Natural Resources and Mines, Manufacturing and Regional and Rural Development (DNRMMRRD) or Heritage Minerals Pty Ltd activities. An understanding on the environmental values of Dam 8 and the potential implications the proposed activity has on any sensitive values is not described. This may include reduction in water contributions and potential flow pathways impacting the water quality of Dam 8. The application material states a concrete plug, and mine spoil will be utilised to seal the tunnel. The mine spoil and its characteristics have not been described to confirm if this is suitable or has the potential to leach through to Dam 8 in the event the concrete plug has not sealed the entrance.
TSF are identified towards Dam 8. Describe the mitigation and management measures proposed to avoid impacts to Dam 8.
c) Detail the properties and characteristics of the mine spoil proposed to fill the tunnel and confirm its suitability to ensure potential leachate from tailings material will be avoided.
6
Sandstone Gully Tailings Storage Facility (SSG TSF)
Provide a suitable CCA for the SSG TSF demonstrating the hydraulic performance criteria as proposed. Alternatively, revise and submit a CCA for the approved SSG TSF confirming the appropriate hydraulic performance criteria for the structure.
The hydraulic performance criteria for the SSG TSF is proposed to be amended. The application material, which includes the SSG TSF Report (Golder, 2020) 4 , does not include information supporting the assertion that the consequence category assessment (CCA) for SSG TSF determined the consequence category as ‘high’ for dam break and ‘low’ for overtopping and seepage. As such, it cannot be determined if the proposed amendments are appropriate.
7
Water balance model (SSG TSF)
Provide revised application material which:
The water balance technical memorandum confirms that SSG TSF is not considered a TSF in the assessment and instead ‘an additional area within the mine site’ (GHD, 2025). This change necessitates urgent clarification regarding the structures purpose, alignment with the sites approved activities and proposed water
a) Provide a detailed explanation and clarify what is ‘an additional mine area’ and what its intended purpose is as it relates to the SSG TSF footprint.
4 Golder, Sandstone Gully TSF, Mt Morgan Gold Mine, 12 Feburary 2020
Page 5 of 20 • ESR/2016/3447 • Version 4.02 • Last reviewed: 29 OCT 2025
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