Waste Management

2023 Sustainability Report
FY23 ESG Performance Data
Sustainability Case Studies

Management Approach

We ensure that waste, product materials, and other effuents generated from mining and processing activities are handled, stored and disposed of responsibly. Operational waste streams are generally classified as mineral and non-mineral.

Each operation manages non-mineral and mineral waste in accordance with a comprehensive site-specific Waste Management Plan developed as early as reasonably practicable in the mine lifecycle and updated regularly. These plans ensure responsible non-mineral and mineral waste management by specifying how the different types of waste produced by activities are to be managed, including identification of opportunities for waste minimisation, recycling and reuse. Non-hazardous waste streams such as cardboard, glass and plastic are recycled, where feasible, and general waste is diverted to landfill.

Mineral Waste

The most substantial waste stream generated is mineral waste. Mineral waste is defined as excess material removed from the mine void in order to reach the ore body and remaining materials after the extraction of mineral from ore during processing (i.e., waste rock and
tailings). All mineral wastes are handled in accordance with our Sustainability Performance Standards and licence conditions. Each operation is unique in terms of potential for acid mine drainage (AMD), neutral mine drainage (NMD) and saline drainage (SD) generation through mineral waste movement and placement. Where management of potentially problematic material is uncertain or known to occur, the operation maintains plans and implements progressive rehabilitation activities to ensure the receiving environment is not impacted during the operational and closure phases.

Management of mineral waste is achieved by application of an integrated planning approach. All mineral waste is geochemically categorised prior to mining, haulage, treatment, placement and encapsulation (if required) prior to rehabilitation. The integrated planning approach aims to assure the protection of environmental values where we operate, and application of appropriate technical and economic risk management.

Performance

In FY23, our operations excavated 16,530,148 million tonnes of waste rock to extract 26,294,608 million tonnes of ore. This represents an average 0.63 strip ratio of waste to ore, a decrease from the FY22 1.16 strip ratio.

The strip ratio decreased generally due to a reduction in the proportion of open cut mining (generally higher strip ratio) compared to underground mining (generally lower strip ratio) methods across the portfolio. Cowal underground commenced mining in early 2023, along
with the operating open cut mine. In Mungari the majority of the mining in FY23 was underground.

Non-Mineral Waste

Evolution generates non-mineral waste through a range of activities throughout our mine lifecycle, including exploration, mining, maintenance, and processing.

During FY23, approximately 23,658 tonnes of non-mineral waste was generated across our operations, of which 75% was classified as non-hazardous waste. In FY23, 32% of the total non-mineral waste was recycled across our operations. All waste generated was recycled or disposed of following applicable waste regulations and each operation’s Waste Management Plan.

Case Study

Progressive rehabilitation of waste rock dump – White Foil

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2023 Sustainability Report

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FY23 ESG Performance Data

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ESG and Regulatory Reporting

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Codes, Policies & Standards

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Sustainability Case Studies

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Tailings Dam Management Disclosure 2023

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Climate Risk Position Statement

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