 Saskatchewan's potash production is heavily concentrated in the Qu'Appelle Valley corridor.As of 2013 there are six mines operating and eight mines in the proposal stage located in the Qu'Appelle River Watershed.Mines in this area access the water necessary for production from three different source points—the Qu'Appelle River system itself, groundwater, and Lake Diefenbaker (which comes from the Saskatoon South East Water Supply System—SSEWS).