Noranda Alumina officials say they'll know if a few weeks how much unpermitted mercury is still being released from their Gramercy plant Advocate staff photo by HILARY SCHEINUK -- The Noranda Alumina refinery in Gramercy, photographed Jan. 30, 2015. The state Department of Environmental Quality is investigating unexpected emissions of toxic mercury from the plant, while the company is testing how much of the toxin is being emitted.