The major component of which of the following ore is sulphide based mineral?

We need to identify which ore has a sulphide-based mineral as its major component.

Analyzing each ore:

Calamine: ZnCO$$_3$$ — This is a carbonate ore of zinc.

Siderite: FeCO$$_3$$ — This is a carbonate ore of iron.

Sphalerite: ZnS — This is a sulphide ore of zinc. ✓

Malachite: CuCO$$_3$$ · Cu(OH)$$_2$$ — This is a basic carbonate ore of copper.

Among the given options, only Sphalerite (ZnS) is a sulphide-based mineral.

The correct answer is Option 3: Sphalerite.