Schematic of gypsum stacks at Mosaic Fertilizer's Uncle Sam facility in St. James Parish, from a 2014 permit application filed with the state Department of Environmental Quality. Mosaic Fertilizer, LLC, one of the world's largest manufacturers of phosphate and potash fertilizers , has entered into a $2 billion settlement with the Environmental Protection Agency , Louisiana Department of Environmental Quality and Florida Department of Environmental Protection to end a 10-year battle over the disposal of hazardous wastes in huge stacks of gypsum wastes along the Mississippi River in Louisiana and in several locations in Florida.