Environment
At De Grey, we endeavour to achieve excellence in environmental management by obtaining and following the best advice and implementing best practice, monitoring and measuring our environmental performance. We implement measures wherever possible to reduce the impact our operations have on the environment.
De Grey recognises the biodiversity value of the Pilbara Region and has conducted extensive technical and biological studies to understand its environmental significance. These studies cover an area of approximately 30,000 hectares.
The Hemi Project covers approximately 22,000 hectares. The Project boundary has been carefully designed to avoid areas of high environmental value, including a sand dune and the permanent pools of the Yule River. The Project plans a disturbance footprint of up to 5,830 hectares, the maximum area needed for safe development, mining, processing operations, and supporting infrastructure.
Invitation for public comment
De Grey Mining Ltd is inviting public comment on a proposal to develop the Hemi Gold Project (EPA Assessment Number 2380), located approximately 85 km south of Port Hedland in the Pilbara Region of Western Australia.
The Hemi Gold Project is a greenfield gold mining project involving the excavation of open pits, mine dewatering, surplus water management, and associated infrastructure.
The Hemi Gold Project was referred to the Environmental Protection Authority (EPA) under Part IV of the Environmental Protection Act 1986 on 8 June 2023. On 12 October 2023 the EPA determined that the Proposal would be assessed with the level of assessment set at Assessment on Referral Information with additional information and public review of four (4) weeks.
The Revised Referrals Supporting Document will be available for viewing and public comment from 25 November – 23 December 2024. The relevant documentation is available to download below or on the EPA website. Hard copies will be available to view at the Port Hedland, South Hedland and the WA State libraries.
EPA Referral
Revised Referral Supporting Document
Supporting Documentation
- Appendix 1 - Environmental Management Plan
- Appendix 2 - Conceptual and Numerical Groundwater Modelling – Operational Phase
- Appendix 3 - Technical Review of Conceptual and Numerical Groundwater Modelling – Operational Phase
- Appendix 4 - Tailings Storage Facility Design Report
- Appendix 5 - Sub-surface Materials Characterisation
- Appendix 6 - Turner River and Site Closure Flood Modelling
- Appendix 7 - Conceptual Mine Closure Plan
- Appendix 8 - Stakeholder Engagement Register
- Appendix 9 - Turner River Dewatering Discharge Tier 2 Environmental Risk Assessment
- Appendix 10 - Turner River Dewatering Discharge Tier 2 Environmental Risk Assessment Addendum
- Appendix 11 - Baseline Aquatic Ecology Study of the Turner and Yule Rivers
- Appendix 12 - Baseline Aquatic Ecology Study of the Turner and Yule Rivers, Flood Study Memorandum
- Appendix 13 - Baseline Flora and Vegetation Assessment
- Appendix 14 - Status of Seringia exastia
- Appendix 15 - Gregory Land System Priority Ecological Community Memo
- Appendix 16 - Turner River Flora and Vegetation Assessment
- Appendix 17 - Vertebrate Fauna Surveys
- Appendix 18 - Short Range Endemic Fauna Survey Report
- Appendix 19 - Subterranean Fauna Survey Report
- Appendix 20 - Targeted Stygofauna Survey Memo
- Appendix 21 - Subterranean Fauna Habitat Assessment
- Appendix 22 - Environmental Noise Assessment
- Appendix 23 - Emissions Estimates, Peer Benchmarking and Scope 3 Review
- Appendix 24 - Greenhouse Gas Environmental Management Plan
- Appendix 25 - Greenhouse Gas Environmental Management Plan Independent Peer Review
- Appendix 26 - Air Quality Assessment
- Appendix 27 - Commercial in Confidence information (Not Available for Public Review) - we will include this as text for holistic purposes but there will be no link to the appendix
- Appendix 28 - Impact Reconciliation Procedure
Environment Approvals
- Appendix 01 - Groundwater and Surface Water Assessment Geowater 2023
- Appendix 02 - Hemi Deposits Sub Surfacce Materials Characterisation
- Appendix 03 - Hemi Gold Project Kinetic Column Interim Results
- Appendix 04 - TSF Design Report Hemi Gold Project
- Appendix 05 - De Grey Turner River and Site Closure Flood Modelling
- Appendix 06 - Conceptual Mine Closure Plan - Hemi Gold Project
- Appendix 07 - Community Relations Stakeholder List and Register
- Appendix 08 - Mallina Gold Project Baseline Aquatic Ecology Survey Report
Appendices
- Appendix 01 - Groundwater and Surface Water Assessment Geowater 2023
- Appendix 02 - Hemi Deposits Sub Surfacce Materials Characterisation
- Appendix 03 - Hemi Gold Project Kinetic Column Interim Results
- Appendix 04 - TSF Design Report Hemi Gold Project
- Appendix 05 - De Grey Turner River and Site Closure Flood Modelling
- Appendix 06 - Conceptual Mine Closure Plan - Hemi Gold Project
- Appendix 07 - Community Relations Stakeholder List and Register
- Appendix 08 - Mallina Gold Project Baseline Aquatic Ecology Survey Report