Tsis ntev los no, ib pab pawg hlau ua hauv tsev ua kom muaj kev txawj ntse ntau ntxiv, kev siv hluav taws xob nce ntxiv rau 99.5%, thiab ntau dua cov khoom siv tau nce los ntawm 20%. Cov kab ntau lawm feem ntau ua rau muaj high-lub zog cants xws li qu100 thiab qu120, nrog kwv yees ib xyoo ntau lawm muaj peev xwm ntawm 500, {8}} tons.
