For all the doom and gloom about the future of coal, the past two years have been a boom time for coal prices that's exceeded by their 2010 to 2012 peak.
More than half the 2017 combined market cap gains for the world's largest listed miners accrued to just five firms as gold producers drop out of top 10.
BHP said it would seek responses from the World Coal Association over policy differences before making a final decision on whether to quit in March 2018.
Coal may have fallen out of favor in North America and Europe, but India and other Asian nations ensure the dirtiest fossil fuel continues as energy supply.
Newcastle, the world’s largest coal export port, must “urgently” diversify its traffic, the port’s incoming chairman has said, warning that the “long-term outlook for coal is a threat to the port”.