The ore on heating produces sulpher dioxide gas so it is a sulphide ore. The method used for its concentration is "forth 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.
(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).
$$MO + \underset{(Coke)}{C} \rightarrow M + CO$$