Injured was helping 2 other miners re-rail a 555 scoop at the 230 foot mark of the slope track. Two airbags were placed to lift the scoop, blocking was being installed to support the scoop to deflate the bags when a crib block shot out from underneath an airbag and struck the injured employees hard hat, resulting in a small contusion to EEs forehead and a sprain/strain to EEs neck.