Erosion control was required for infrastructure protection of dam walls and access roads. This mine, located in the Northern Territory, is subject to extreme rainfall and cyclonic conditions. Its highly contaminated soil was toxic to plant growth, which made it extremely susceptible to erosion damage. A solution was required to stabilise and protect the infrastructure, as the mine had received severe cyclone and rainfall damage to its access roads and dam walls. Land rehabilitation and re-vegetation of residue sand and redmud was also required.
When the tailings pond was full, the dam retaining wall was raised using a mixture of bauxite mining waste, local fill and redmud. This meant that the dam wall was highly toxic. The Vetiver System design was required to address soil stabilisation, water flow erosion and land regeneration. Veticon placed Vetiver hedgerows down the side of the dam wall at intervals of 1.5 metres, to address the erosion issues. To rehabilitate the contaminated land, Vetiver was planted on the residue sand and land surrounding the tailing ponds.
The Vetiver grew well in this highly toxic caustic redmud, residue sand and on the dam wall. The Vetiver System design successfully stabilised the tailings dam wall, protecting it and the access roads along the wall from erosion. The Vetiver was also successful in the revegetation of residue sand and red mud.