1 coal PT 2007-05-24 2 mining PT 2007-05-24 NT 9 opencast mining PT 5 austenitic steel PT 2007-05-24 BT 10 steel PT 6 chromium steel PT 2007-05-24 BT 10 steel PT 7 manganese steel PT 2007-05-24 BT 10 steel PT 9 opencast mining PT 2007-05-24 BT 2 mining PT 10 steel PT 2007-05-24 NT 5 austenitic steel PT NT 6 chromium steel PT NT 7 manganese steel PT