Rehabilitated mine sites and Top End animals
Effective rehabilitation is a major challenge for the many active and legacy mines across northern Australia. Rehabilitation has historically focused on site stabilisation and re-establishing vegetation cover. Best practice mine site rehabilitation now aims for ecosystem restoration. This means sustainably integrating the site with the surrounding landscape – re-establishing animal and plant communities, as well as ecological processes like nutrient cycling, pollination and seed dispersal.
The Ranger Uranium Mine, surrounded by Kakadu National Park, is due to be rehabilitated by 2026. Rehabilitation trials started in the 1980s and have had varying success, but the site currently has no rehabilitation specifications for animals other than that no exotic species should be introduced. The animal species occurring in surrounding natural habitat can serve as a benchmark for assessing the success of faunal rehabilitation at the mine. This project aims to set such benchmarks for both vertebrate and invertebrate fauna. Results from the research are helping set the standards or closure criteria for successful ecosystem restoration at the Ranger mine. The Australian Government will use the criteria to assess rehabilitation success at the mine.
This project is:
- surveying natural reference sites surrounding Ranger Uranium Mine to identify invertebrate animals (ants, beetles, spiders and wasps) for informing mine closure criteria
- analysing existing data to determine how best to use vertebrate animals for informing mine closure criteria
- designing a robust sampling methodology for ongoing vertebrate animal monitoring and assessment
- providing valuable information on how the trial revegetation sites are helping animals to re-establish in the area
- helping inform rehabilitation at other mine sites in northern Australia.
- Review literature on faunal colonisation of rehabilitated mine sites and international standards of ecosystem restoration
- Survey representative terrestrial invertebrates (ants; carabid, tenebrionid and curculionid beetles; lycosid and zodariid spiders; and mutillid wasps) using pitfall traps at eight natural reference sites surrounding the Ranger mine
- Analyse data from existing long-term monitoring plots from northern Kakadu to identify appropriate vertebrate species for incorporation into closure criteria, and to design a robust sampling methodology for ongoing vertebrate monitoring and assessment
- Use the above activities to develop potential faunal closure criteria that incorporate international standards of ecosystem restoration and that reflect the rehabilitation objective for Ranger that ‘Established habitats will support faunal communities similar to that in Kakadu National Park’.
- Survey data on invertebrate assemblages occurring at natural reference sites
- Recommendations for ongoing vertebrate monitoring and assessment
- Proposed faunal closure criteria for the rehabilitation of the Ranger mine area
- Report, summary factsheet and associated scientific papers.
Fieldwork is taking place at Ranger Uranium Mine and the surrounding parts of Kakadu National Park, 230km west of Darwin, Northern Territory.
This project is being led by Professor Alan Andersen from Charles Darwin University (CDU). Professor Andersen is being assisted by researchers from CDU, the Supervising Scientist Branch of the Department of the Environment and Energy, the Northern Territory Government and Energy Resources of Australia Ltd.
Alan Andersen, Charles Darwin University
Ensuring that the rehabilitated sites are functional ecosystems is a crucial rehabilitation component. Photo: Michael Douglas.
Ensuring that the rehabilitated sites are functional ecosystem is a crucial rehabilitation component. Photo: Michael Douglas.
The surrounding Kakadu National Park sets the standard for rehabilitation. Photo: Michael Douglas.
This research will help us know which animals should b living at rehabilitated mine sites. Photo: NESP Northern Hub.
This research aims to provide a framework for returning sites to former faunal complexity.