Iran bans bitcoin mining, echoing China, after blackouts
Authorities decided to act after concluding the spike in electricity consumption from server farms underpinning Bitcoin and other tokens was a key factor behind rising demand for coal.
With some vessels waiting to load coal and iron ore outside Australian ports for over a month, key charter rates jumped to highest in more than three years.
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.