Mining company CAP reported on Saturday that the spill occurred at its onshore terminal on Guarello Island, about 150 miles north of the town in Puerto Natales, and moved into the waters of the South Pacific, the navy said.

Chile has initiated an emergency response and a pollution response and control team is expected to reach the island on Sunday. The cause of the spill is under investigation, the navy said.

CAP, which mines limestone on the island, did not immediately respond to a request for comment.