Postmasburg and its adjacent areas of South Africa is major producer of which of the following minerals?

The correct answer is C) Manganese. Postmasburg lies in the Northern Cape and is the commercial hub of the Kalahari Manganese Field, which holds some of the largest known manganese reserves in the world. Iron ore is also mined in the same belt, so the region is known for both, but manganese is the mineral the question asks about.

• Uranium (A) is wrong. Major producers are Kazakhstan, Canada, Namibia and Australia. South Africa's uranium came mainly as a by-product of gold tailings on the Witwatersrand, not from Postmasburg.
• Bauxite (B) is wrong. Guinea, Australia, China and Brazil dominate bauxite output. South Africa is not a major bauxite producer.
• Mica (D) is wrong. Mica is associated with pegmatite belts in India (Jharkhand, Andhra Pradesh, Rajasthan) and Madagascar. It is not a Postmasburg mineral.

Manganese is the key input for steel, since it is used for desulphurisation and as an alloying element. That makes it a strategic mineral, and it links directly to GS-III questions on critical minerals and India's dependence on imports. India's domestic manganese ore comes mainly from Odisha, Madhya Pradesh, Karnataka and Maharashtra.

Trap: Aspirants see Africa and pick uranium or bauxite by association with well-known African producers. Map the region first: Northern Cape means manganese and iron ore, not gold or uranium.