Yakhelwe ngokusebenza kanye nesitayela engqondweni
I-Rock Arm, njengengalo eguquliwe enezinhloso eziningi, ifanelekela ukumbiwa ngaphandle kokuqhumisa, njengezimayini zamalahle ezivulekile, izimayini ze-aluminium, izimayini ze-phosphate, izimayini zegolide zesihlabathi, izimayini ze-quartz, njll. Ifanelekela futhi ukumba amatshe okutholakala ekwakhiweni okuyisisekelo njengokwakhiwa kwemigwaqo kanye nokumba phansi, njengobumba oluqinile, idwala eligugile, i-shale, idwala, i-limestone ethambile, itshe lesihlabathi, njll. Inemiphumela emihle, amandla aphezulu emishini, izinga lokwehluleka eliphansi, ukusebenza kahle kwamandla okuphezulu uma kuqhathaniswa nezando eziphukile, kanye nomsindo ophansi. I-Rock Arm iyindlela yokuqala yokukhetha imishini engenazo izimo zokuqhumisa.
