Nova Scotia’s Environment Minister Iain Rankin has ordered Northern Pulp to make stack tests at the Pictou County mill public on its website until its industrial approval expires in 2020. (CHRISTIAN LAFORCE / File) The province has ordered Northern Pulp to address issues with its power boiler that have resulted in failed stack tests. Environment Minister Iain Rankin has ordered the company to make stack tests at the Pictou County mill public on its website until its industria