For every tonne of potash that’s mined, another two tonnes of excess salt are brought to the surface. Expensive to transport, piles of salt grow and leach into soil over centuries. But this summer, Saskatoon-based Gensource Potash Corporation expects to start construction on a potash-producing facility in Tugaske, Sask., that’s peppered with features that are easy on the land, water and air. “We saw an opportunity to do it (potash mining) differently,” said Gensource CEO Mike Ferguson. “We’ll do it in a saleable, efficient and environmentally sustainable way.”