Mount Morgan Mine Upper Mundic Gully TSF EA Amendment

4.7 Surveillance requirements

Surveillance requirements for the UMG TSF will be defined in details in the Operations, Maintenance and Surveillance (OMS) Manual. Key sections to be included are: — Inspections requirements and associated frequencies — Operations inspection

— Routine dam safety inspection — Annual dam safety inspection — Event driven special inspection

— Monitoring program, including instrumentation and performance observations — Trigger action response plans (TARPs) outlining trigger levels and required responses

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

WSP March 2026 Page 7

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