
Luhlobo luni lwe-drill ekufuneka lusetyenziswe kwi-quartzite formations?
Ezi zixhobo zokubhoboza zisebenzisa itekhnoloji ye-carbide esele iphezulu kunye netekhnoloji enelungelo elilodwa lomenzi, ebonelela ngokugqwesileyo kokunxiba kunye nokusebenza okuzinzileyo, kwaye inok...




















