Despite objections from several groups, the Harper government declared over the weekend the humpback a "species of special concern" under the Species at Risk Act (SARA).
The mine has an initial annual production capacity of 35 million tonnes and is a key part of BHP's plans to lift capacity from its Pilbara operations to 220 million tonnes a year.
Weak commodity prices hurt Teck's three core business units —coal, copper and zinc— but coal was particularly hard hit due to increased supply from Australia, the company said.