The Australian heads of a platinum mine have been indicted in the US for conspiring to dump waste in Alaska's Salmon River, which crosses a wildlife refuge.

The 28-page indictment handed down by a grand jury in the US District Court of Alaska portrays Sydney-based Bruce Butcher, the former chairman and chief executive of XS Platinum Inc, and former executive vice president Mark Balfour of Perth, as focused on the mine’s viability rather than the environment. Butcher…