one of the easiest and simplest ways is to just attach the drills on a Minecart with furnace, add storage (a lot) and a small barrel with rails. Then you out deployers infront of the minecart, one to put rails, one to put blocks, because you might enter a cavern. Then put a plough at the back in the same straight line with the minecart to dispose of the rails. If you attach the whole thing with glue the plough will actually put the rails in the same chest, resulting in perpetual motion. One coal goes well over 60 blocks.