The ore on heating produces sulphur dioxide gas so it is a sulphide ore. The method used for its concentration is "froth floatation process". After concentration of the ore following two steps would be followed to convert it into metal.
(i) Roasting: The sulphide ore is converted into its oxide by heating it in the presence of air.
MS + O2 -------> MO + SO2 ↑
(ii) Reduction of metal oxide to metal: The oxide formed by roasting is then reduced to metal by using a suitable reducing agent like carbon (coke).
MO+C------>M+CO
