Longwall mining is the safest and most economical way to mine coal in underground mines. At present 37 longwall panels in 11 states are mining more than 50% of underground mined coal. Proper degasification of the panels prior to mining and post mining promotes mine health and safety and improves productivity. Produced gas can be sold for added profit. For proper degasification, all coal seams are divided as shallow, medium-depth and deep coal seams. The degasification scheme for a typical mine in each category is discussed in detail. Special attention is given to floor gas capture that has led to some recent coal mine disasters.
