Summary
IEMA partnered with Muswellbrook Coal Company Limited and Idemitsu Australia to deliver an integrated mine closure planning program for the Muswellbrook Coal Mine following the cessation of mining in 2022. The multi-year program addressed the complexities of closing a legacy mining operation with more than a century of mining history, integrating technical investigations, rehabilitation planning, risk management, regulatory requirements, and stakeholder considerations into a coordination closure strategy.
The Objective
Muswellbrook Coal Company required a structured and adaptive closure planning program to support rehabilitation, decommissioning, and long-term land use outcomes across a historically complex mining operation. The objective was to integrate technical studies, manage closure risks and knowledge gaps, align with evolving regulatory requirements, and establish a practical pathway towards future relinquishment while rehabilitation activities continued on site.
Our Response
IEMA partnered closely with Muswellbrook Coal Company and Idemitsu Australia to develop and implement a comprehensive closure planning framework aligned with corporate standards, NSW rehabilitation reforms, regulatory obligations, and stakeholder expectations.
Our involvement commenced with the development of the Mine Closure and Rehabilitation Framework and Closure Planning Base Case assessment, providing the foundation for identifying closure priorities, knowledge gaps, and future investigations.
Building on this framework, IEMA coordinated and integrated a broad suite of multidisciplinary technical studies covering rehabilitation, contamination, geochemistry, geotechnical engineering, groundwater, surface water, biodiversity, heritage, hazardous materials, mine sealing, demolition, and socio-economic considerations.
A key component of the program was the development of eleven Closure Management Areas (CMAs), providing a practical framework for risk management, implementation planning, and future relinquishment across the site.
Throughout the program, IEMA provided closure strategy development, risk assessment, governance support, regulatory alignment, stakeholder engagement assistance, and preparation of the Detailed Mine Closure Plan, ensuring closure planning remained adaptive as investigations progressed and rehabilitation works advanced.
The Impact
IEMA delivered an integrated, risk-based closure planning program that provided greater confidence in rehabilitation outcomes, closure execution pathways, and long-term liabilities.
The work established a structured framework for coordinating complex technical investigations, reducing closure uncertainty, and supporting informed decision-making throughout the closure process. By bringing multiple technical disciplines and workstreams together into a single, coordinated program, IEMA helped strengthen governance, improve financial and rehabilitation planning, and support future relinquishment of this legacy mining operation.
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