Kev lag luam mining

Cov neeg siv khoom Hassan pob tw yog los ntawm Pakistan thiab saib tshiab los tiv thaiv cov roj rau lawv cov cuab yeej sib koom ua ke laum tshuab, nws lub tuam txhab tau ntsib qhov teeb meem nyuaj tshaj plaws, lawv tau siv los tiv thaiv cov roj uas nws qhuav tawm sai thiab tsis muaj lubricity.