Companies in metals and mining have been hit especially hard amid concern that the rising trade frictions from the tariffs have helped crimp economic growth.
Red Mountain stands between the Cambria Icefield and its largest outlet, the Bromley Glacier. From the nearby town of Stewart, it is a 10-minute helicopter ride.
BHP had promised to return all of the net proceeds from the $10.8 billion sale of its U.S. shale business to shareholders when the deal was announced in July.