Disruptions at two major coal operations over the past week have heightened concerns about insufficient supply at a time of growing demand for the commodity, sparking a rally in ASX-listed mining stocks.

Underground fires at Anglo-American’s Grosvenor mine in Queensland and Allegheny Metallurgical’s Longview mine in West Virginia have interrupted production at both mines, which together account for about 2.5 per cent of the hard coking coal export market.