Annual and Audit Reports 2024 Annual Review - Mannering Colliery 2023 Annual Review - Mannering Colliery 2023 Delta Coal Annual Rehabilitation Report and Forward Program 2022 Annual Review - Mannering Colliery 2022 Independent Environmental Audit 2021 Annual Review - Mannering Colliery Annual Review 2020 2019 Annual Review 2019 Independent Environmental Audit 2019 Independent Environmental Audit - Action Plan