3. Mining activities Heritage Minerals plans to recommence operations at the Mount Morgan Mine with tailings reprocessing in mid- 2025, following processing plant and associated mine infrastructure construction and water management activities commencing late-2024. Refer to Section 3.1 for further information on the temporary discharge of four (4) million dry weight tonnes of treated tailings into the Open Cut Pit (OCP) which is allowable under EPML00433013, effective date 6 February 2025. Planned future operational activities for each mine feature are displayed in Table 3.
Table 3
Future operational activities
Mine Feature
Operational Activities – Mineral processing
Process Plant & ROM Pad
Pipe Corridor
– Transport of process water and tailings.
Part of No. 2 Mill Tailings Dam
– Shape surface to minimise runoff of contaminated water. Install diversions to minimise clean waters entering location – Remove overlying waste. – Recover tailings for processing. – Remove and relocate any waste in the remnant walls that directly impacts the mining of the tailings. – Leave stable batters on any remaining waste dumps or remnant walls. – Remove overlying waste. – Recover tailings for processing. – Remove and relocate any waste in the remanent walls that directly impacts the mining of the tailings. – Leave stable batters on any remaining waste dumps or remnant walls – Remove overlying waste. – Recover tailings for processing. – Remove and relocate any waste in the remanent walls that directly impacts the mining of the tailings. – Leave stable batters on any remaining waste dumps or remnant walls – Shape surface to minimise runoff of contaminated water. – Install diversions to minimise clean waters entering location. – Remove overlying waste. – Recover tailings for processing. – Remove and relocate any waste in the remanent walls that directly impacts the mining of the tailings. – Leave stable batters on any remaining waste dumps or remnant walls. – Establish bund/sump. Recover waste rock crush at site and truck material to plant. Expose former natural land surface. – Leave stable batters on any remaining waste dumps or remnant walls.
Mundic Sulphide Tails
Red Oxide Tails
Part of Shepherds Gully Tails
B Dump
K Dump Q Dump Shepherds Outer Dump
– Placement of waste rock – Shape and compact placed waste to reduce rainfall infiltration and clean water runoff
Horse Paddock Dump
– Placement of waste rock – Shape and compact placed waste to reduce rainfall infiltration and clean water runoff – Placement of waste rock – Shape and compact placed waste to reduce rainfall infiltration and clean water runoff
Airfield Dump
Sandstone Gully
– Permanent storage of tailings
GHD | Heritage Minerals | 12626510 | Waste Management Plan
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