At midnight Saturday, the glazed glass doors of Saskatoon's Emerald Casino will slide shut on gamers for good, putting an end to patrons' routines, which sometimes stretch back decades. The Emerald is closing after the provincial government, which wanted just one casino in the Saskatoon area, struck a deal to compensate Prairieland Park with revenues from the new Dakota Dunes casino. The new CAD 61-million facility is set to open Aug. 10 on the Whitecap Dakota First Nation 30 kilometres south of Saskatoon.