GaRDS
Currently, the main method of controlling ongoing sulphide oxidation in underground workings at present is to flood the workings once mining ceases. This approach is not appropriate to all sites and has several major drawbacks. High costs of implementation and the substantial risk of catastrophic failure add to its unpopularity.
The GaRDS (Gas Redox and Displacement System) technique has significant advantages for mine operators who wish to temporarily close a mine, implement a low-cost and passive acid drainage prevention strategy, and retain the option of reopening the mine if metal prices increase. This approach is fully compatible with current ARD strategies of covering waste rock dumps or closing underground mine openings. Implementation of GaRDS is designed to rapidly improve drainage water quality emerging from enclosures, and prevent further sulphide oxidation.
If you have any queries regarding this approach, or potential applications, please contact Earth Systems for further information.
