https://www.cbc.ca/news/canada/sudbury/
Mining company currently building new drainage system to contain slag run-off
Environment Canada has decided not to lay charges against Vale for potentially dangerous run-off leaking from its Sudbury slag piles. But the mining company is currently installing a new system for controlling the slag seepage, work it says is unrelated to the government investigation.
Environment Canada refused an interview with CBC, but said in a statement that it began investigating contaminated water coming from the Sudbury slag pile after a complaint from the public in 2012.
Court documents filed to obtain a search warrant for Vale offices in 2015 allege that someone discovered green foam in a creek near the slag piles on Big Nickel Mine Road that had high levels of nickel and other metals.