Give the steps involved in the extraction of metals of low and medium reactivity from their respective sulphide ores.

(N/A) For metals of low reactivity:
Sulphide ore $\xrightarrow{\text{Roasting}}$ Metal $\xrightarrow{\text{Refining}}$ Pure metal
For metals of medium reactivity:
Sulphide ore $\xrightarrow{\text{Roasting}}$ Metal oxide $\xrightarrow{\text{Reduction}}$ Metal $\xrightarrow{\text{Refining}}$ Pure metal
$1$. Roasting: The sulphide ore is heated strongly in the presence of excess air to convert it into metal oxide (for medium reactivity) or directly into metal (for low reactivity).
$2$. Reduction: The metal oxide obtained is reduced to metal using a suitable reducing agent like carbon.
$3$. Refining: The crude metal obtained is purified through various methods like electrolytic refining.