He mea nui ngā taraka kawe ki te umanga keri, ā, he waka whai hua nui hoki mā ngā kaiwhakahaere me ētahi atu kaimahi. Ka pāngia tonutia ngā taraiwa e te ru me te wiri i te wā e utaina ana, e kawe ana hoki. I whakamātauhia e Arex te pānga o te toka ki tētahi pereti maitai, ā, i kitea he teitei o te 108 desipere, kātahi ka whakamahia e mātou te mata waea maitai manganese hei anga i roto i te raina rapa 6 inihi, ka taea te whakanui ake i tōna pakari, ā, ko te hua teitei ko te 60 desipere anake. He pai ake i ngā raina maitai ina pā te pānga me te kino i te wā e utaina ana te kohatu ki roto i te moenga.