Composite tails technology was used to fill in the former East Mine area which is now under active reclamation.
Composite Tails (CT) combines fluid fine tails with gypsum and sand as tailings are deposited in a mined-out area. This mixture causes the tailings to settle more quickly and release water. CT is then capped with sand and soil, enabling the development of landscapes that support grass, trees and wetlands. This technique was used to fill in the former east mine pit, which is now under active reclamation.
We are also working to improve CT deposition and increase fines captured through a technique which places CT under a layer of water in the mined-out area. Sand is then added and the water later pumped out and recycled. This leaves a landform base which can be capped with soil, and reclaimed. Results from a commercial-scale test are being evaluated.
A 54-hectare fen wetland research project has been constructed in a portion of our former East Mine area. Composite tailings was used to fill up the mine pit and form the landscape foundation. Reclamation planting was complete in 2013.