Bids are invited from overseas coal producers owning coal mines or overseas coal suppliers duly backed by letter of authority of the concerned coal producer. The imported coking coal to be supplied should have a size ranging from 0-50 mm while the total moisture content should be 8%, ash content should be 8%, whereas sulfur content should be 0.6%. Interested parties can submit their bids until May 14, 2012. The bids will open immediately after expiry of the deadline for submission of bids.