The picture on the left shows the former Denison Mill location and the related Tailings Management Areas (TMA-1 in the top right and TMA-2 in the middle right) in 1997. Quirke Lake is located in the top left.
The Denison Mine closed in 1992. During rehabilitation nearly 2.8 million cubic yards of tailings were hydraulically relocated mostly into deeper areas of TMA-1 while some tailings were placed into the underground workings. All tailings have a 3 foot water cover.