09/26/2012 01:20 EDT | Updated 11/26/2012 05:12 EST

PotashCorp probing cause of mine fire in Saskatchewan; operations to resume soon

ROCANVILLE, Sask. - Operations are expected to resume soon at a Saskatchewan potash mine where a fire forced 20 miners to seek shelter in underground safe rooms.

PotashCorp. says there's no word on the cause of the blaze that broke out Tuesday at its Rocanville (ROH'-kahn-ville) mine, about 245 kilometres east of Regina.

Officials had said a large wooden cable spool started burning.

Spokesman Bill Cooper says it is likely to be days before the company knows for sure what sparked the fire.

Cooper says some air testing has been done to ensure that the mine is safe to enter.

It took about 10 hours to put out the fire and several more hours for rescue crews to determine that it was safe to bring the workers up.