Erosional stability of waste rock batters under simulated rainfall: Report on progress
Internal Report 3
S. J. Riley, Macquarie University
Report on progress on waste rock dump, erosion study at Ranger Uranium Mine in Northern Territory.
- Development of the rainfall simulator has reached the stage at which nozzles are being tested.
- Modeling using USLE and ANSWERS suggests erosion rates of the order of 2 to 4 tonnes/ha on the batters and 0.5-2 tonnes/ha on the cap for storms with intensities between 50 and 100mm.h-1. The annual erosion rates are of the order of 10 and 2 tonnes/ha respectively.
- Modeling suggests that rill/gully erosion is the most significant erosion process and the one likely to lead to breaching of the protective cap of the waste rock dump.
- The monitoring equipment is largely installed, if somewhat behind schedule, and monitoring is underway.