New Delhi, Oct. 8 -- : Sometime in the afternoon on September 29, the Lilagar river, usually a calm tributary of the Mahanadi but at the time in spate for days following heavy monsoon rains, changed course and broke through an embankment to flood a Coal India mine in Chhattisgarh's Dipka. It inundated open pits, submerging heavy machinery, and knocking out operations that will take at least a month to normalise....