Can these economists turn things around for Australia's betrayed generations?, page-11

Garnaut has held a number of government and corporate board positions, while maintaining an academic profile as an economist. For example, he was chairman of the Papua New Guinea Sustainable Development Program from 2002 to 2012,^[7] but resigned after Prime Minister Peter O'Neill's government banned Garnaut from entering Papua New Guinea due to a dispute with BHP Billiton.

https://en.wikipedia.org/wiki/Ross_Garnaut

Under the Stewardship of John Howard if you want to apportion blame.

In 1999, BHP reported that 90 million tons of mine waste was annually discharged into the river for more than ten years and destroyed downstream villages, agriculture and fisheries. Mine wastes were deposited along 1,000 km (620 mi) of the Ok Tedi and the Fly River below its confluence with the Ok Tedi, and over an area of 100 km² (39 sq mi). BHP's CEO, Paul Anderson.