This group includes miners and quarrymen not elsewhere classified, for example those who remove wood and steel supports from disused workings; direct high-pressure streams of water against gravel banks to force gravel into sluices from which metalliferous minerals are recovered; cut stone from quarry faces with power driven saws; split sample cores for mineral-bearing rock strata removed from diamond core drills for laboratory analysis; or extract chalk, clay, gravel or sand from open pits.