There was a frictional ignition on the 6-mains section. Miner operator loaded 1st S/C and made the connection from 5 entry to 5 to 6 x-cut at block 15. The operator was loading the 2nd S/C and was in the process of trimming the bottom when a frictional ignition occurred. The flash was orange/yellow in color and lasted a few seconds. Two employees were injured.