ABSTRACT
Aswehaveseeninthepreviouschapter,minersfrequentlytakerisksthat seeminexplicabletoengineersandmanagement.2Whileminersrarelyadmit thattheythemselvescircumventorviolatesafepracticeinthemines,they describehowcolleaguesretrievetoolsfromunderanunsupportedroof(avery dangerouspractice)ordrillboltsthroughtheirhandswhentheyholdaboltingdevicewiththeirbarehands.Minershavealsobeeninjuredwhenthey restedtheirarmsontheboltingarmoftheroof-boltingmachine-amassive machinethatdrillsandpositionsroofsupports(roofbolts)asworkadvances.3
