Ukuvulela Amandla Okushisekela Umphumela Wemiphumela Yokwenziwa Kwesihlabathi Esiphumelelayo

Imiphumela eqondile ye-shaft (VSI) isithandwa kakhulu emkhakheni wokukhiqiza nokucubungula imishini, ikakhulukazi kuzinhlelo zokusebenza ezidinga ukukhiqizwa kwesihlabathi esezingeni eliphakeme. Yenzelwe ukuchoboza kahle amatshe namatshe abe izinhlayiya ezinhle, ama-VSI adlala indima ebalulekile enqubweni yokwenza isihlabathi, ukuguqula izinto zokusetshenziswa kube yizinsizakusebenza ezibalulekile zezimboni ezahlukahlukene. Kuqala