Shredded cellphones, obsolete computer cables and chewed-up cars are heaped 30 feet high outside Glencore’s 97-year-old copper smelter deep in Canada’s sparsely populated boreal forest.

Swiss multinational Glencore, the operator of Mount Isa Mines, announced in October last year that copper mining operations ...

Glencore runs two nickel, copper and precious metal mines in Sudbury, along with a mill and smelter. The company employs 1,200 people in the region and supports another 1,200 contractors.