Ngaphambilini bekuwumkhuba ukucabangela isethi eyodwa yokuhlukaniswa komkhiqizo, noma ukuhlaziya isikrini, amajika njengafanele ukumela imikhiqizo yakho kokubili okuphakelayo okuyinhloko (okungahluziwe) kanye nesesibili (okuskriniwe), kungenzi lutho oluvumela ukuthi lube ngaphansi kokuqukethwe okuhlala kukhona, ngokwezinga elithile, ekugetshengeni inkwali kanye nezinto ezisetshenziswa emayini.I-avareji inkwali ayikhiqizi okuningi kuleli dwala elingaphansi njengemayini evamile, kodwa umkhuba ovamile ekusebenzeni kwezimayini ukukhumula ingxenye enkulu ye-undersize ngaphambi kwe- primary crusher.Ngokwesibonelo, i-gaw crusher ngokuvamile isetshenziswa njenge- primary crusher.
