Like 2ft of 40mm pins all around a big cement mill (about fifty of them from the inside) "No sorry guys know about it but never really done any"Depending on the amount of material you want to remove and how deep you intend to dig but plasma gouging could be an option. It will also gouge materials that like said above a gas axe won't touch.
Well past that now, never realised till I worked with a bunch of twenty and thirty somethingsI know the feeling Kent .rolling around the cooler tubes at Castle cement gouging lumps out the size of your arm . usually upside down ..early 20,s I loved it .. now ??? nooo