Ntchito:Itha kugwiritsidwa ntchito pakukonza konyowa - 1.2 mm (- 200 mauna a 30 ~ 100%) ore ofiira (hematite ndi limonite, siderite, etc.), miyala ya manganese, ilmenite, chromite, tungsten ore ndi mitundu ina ya mchere wofooka maginito, ndi mchere wazitsulo, monga quartz, feldspar, nepheline ore, kaolin pochotsa chitsulo chodetsedwa ndi kuyeretsa.