Coal prices are soaring as the widespread impact of Cyclone Debbie on Queensland's mining industry becomes clearer.

Metallurgical coal futures in China jumped more than seven per cent to $A255 a tonne in early trade on Wednesday, their highest level since December 2016. Singapore-listed futures for Australian premium coking coal, used in steelmaking, have surged 68 per cent in the last three days to $A297 a tonne….