Mount Morgan Mine Upper Mundic Gully TSF EA Amendment

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References

[1] WSP, “Upper Mundic Gully TSF Concept Design to RL 390 m, Ref: PS213278-WSP-BNE-MNG-REP-019 RevC,” October 2025. [2] Department of Environment, Tourism, Science and Innovation (DETSI), “Manual for assessing consequence categories and hydrauluc performance of structures,” 24 November 2025. [Online]. Available: https://www.des.qld.gov.au/policies?a=272936:policy_registry/era-mn-assessing-consequence-hydraulic- performance.pdf. [3] Department of Environment, Tourism, Science and Innovation, “Structures which are dams or levees constructed as part of environmentally relevant activities,” 24 Nov 2025. [Online]. Available: https://www.detsi.qld.gov.au/_global/policy-register/policy-register-pdf?getdoc=1934&name=era-gl-structures- dams-levees-eras.pdf. [4] Department of the Environment, Tourism, Science and Innovation, “EA EPML00433013; A-EA-AMD-100968556 under section 140 of the Environmental Protection Act 1994,” Januay 2026. [5] Australian National Committee on Large Dams (ANCOLD), “Guidelines on Tailings Dams - Plannings, Design, Construction, Operation and Closure,” 2012. [6] Australian National Committee on Large Dams (ANCOLD), “Guidelines on the Consequence Categories for Dams,” Hobart, Tasmania, 2012. [7] Australian National Committee on Large Dams (ANCOLD), “Guidelines for Design of Dams and Appurtenant Structures for Earthquake,” 2019. [8] Australian National Committee on Large Dams (ANCOLD), “Guideloines on Risk Assessment,” 2003. [9] M. B. R. N. W. W. P. W. M. R. a. I. T. J. Ball, “Australian Rainfall and Runoff - A guide to Flood Estimation,” Commonwealth of Australia, 2019. [10] GHD, RE: Mount Morgan TSF - Basis of Design, 2021. [11] Bureau of Meteorology, “Design Rainfall Data System (2016),” [Online]. Available: http://www.bom.gov.au/water/designRainfalls/revised-ifd/?multi. [Accessed 2 July 2025]. [12] WSP, “Upper Mundic Gully TSF Concept Design to RL 370.9 m, Ref: PS213278_WSP-BNE-MNG-REP-050 RevB,” February 2026. [13] ERM, “Mount Morgan Tailings Project - Sandstone Update, Ore Reserve Report,” November 2024. [14] Golder, “Mount Morgan Tailings Storage Facility - Definitive Feasibility Study,” September 2021. [15] Golder, “Outcomes of Sandstone Gully Geotechnical Site Investigation,” 19 April 2016. [16] Australian National Commitee on large dams (ANCOLD), Guidelines on Tailings Dams Planning, Design, Construction, Operations and Closure, Revision 1, ANCOLD, July 2019. [17] WSP, “Upper Mundic Gully TSF Dam Break and Consequence Category Assessment,” July 2025. [18] WSP, “Upper Mundic Gully TSF Dam Break and Consequence Category Assessment,” July 2025. [19] US Army Corps of Engineers, “Using HEC-RAS for Dam Break Studies,” Commonwealth of Australia (Geosciencse Australia), 2019. [20] WSP, “Definitive Feasibility Study for Sandstone Gully Tailings Storage Facility, Ref: 213278-WSP-MNG-REP- 022 RevA,” February 2025. [21] WSP, “Wattle Gully TSF Options, Ref: PS213278-WSP-BNE-MNG-MEM-017 RevA,” July 2024. [22] Golder, “Assessment of piping potential, Mundic Creek, Mt Morgan,” 22 March 2004. [23] WSP, “Sandstone Gully TSF capacity, Ref: 213278-WSP-BNE-MNG-MEM-006 RevB,” April 2024.

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

WSP March 2026 Page 13

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