Njengamanje, ngokuthuthukiswa kokukhiqizwa kwezimboni zomhlaba wonke, isikali sokusetshenziswa kwemithombo yamaminerali ehlukahlukene siyaqhubeka nokukhula, kungakhathaliseki ukuthi i-metallic noma i-non-metallic ore, ukusetshenziswa kukhula kakhulu.Ngenxa yalokho, ukuhlangana, ukukhula okukhulu, nokukhalipha kwe...
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