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The Macraes Phase Four Project Fast-Track Application

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Road Realignment and Infrastructure Upgrades

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Macraes Road Realignment

To facilitate the proposed extension of Innes Mills Pit, Golden Bar Road and Macraes Road will need to be realigned. The Macraes Road will be realigned in two stages. The first stage will be required to make way for the IM12 expansion; this diversion will involve relocating Macraes Road to the east of the bridge by approximately 160 m to the north. The second stage will be required to make way for the IM13 expansion and will include a total diversion of the road to the south over the FTSF embankment.

Stage 2 of the Macraes Road realignment is intended to provide a 300 m wide corridor for the IM13 road realignment to cater for alignment adjustments in response to engineering and / or environmental requirements. 

SP10 and SP11 tailings material relocation

The SP10 and SP11 TSFs together hold approximately 26 Mt of tailings. All tailings contained within SP10 and SP11 TSF will need to be removed to facilitate full mining of IM13. 

Tailings will be removed using hydraulic mining techniques (high pressure jets) with tailings material to be relocated to the FTSF. Hydraulic mining will source water from within the Macraes Mine Water Management System (MWMS). The figure below provides a conceptual overview of the tailings removal plan. 

MTI Tailings Material Relocation

The MTI TSF’s top 30 metres holds approximately 33 Mt of tailings. All tailings contained in the top 30 metres will need to be relocated to facilitate full mining of IM13, thus reducing the height of the MTI embankment to 515 mRL. The remaining MTI below 515 mRL will remain in place.

Tailings will be removed using hydraulic mining techniques with material to be relocated to the FTSF. Hydraulic mining will source water from within the MWMS.

Open Pit Workshop Relocation

It is likely that the Open Pit Workshop will need to be relocated to facilitate mining in IM13. The figure below identifies the proposed location of the relocated workshop. Subject to the extent of disturbance and proposed ongoing use of the existing Open Pit Workshop site, some level of site rehabilitation may be required to address contaminated land effects. Existing infrastructure, including fuel tanks and oil separation systems will need to be removed.

The bulk and shape of the proposed Open Pit Workshop will be generally as per the existing structure. The height of the existing Open Pit Workshop is 16 m and it covers an area of approximately 4000 m², excluding the surrounding hardstand and carpark area. As with the existing Open Pit Workshop, the proposed location will be required to provide for refuelling and hazardous substance storage.