Which rare metal ore, historically mined alongside tin on the Jos Plateau, made Nigeria the supplier of over 90 percent of the world's supply in the 1950s?
Answer and explanation
Correct answer: B. columbite
- Step 1: Columbite is an ore of niobium (columbium), essential in the manufacture of heat-resistant steel alloys for jet aircraft turbines. Step 2. In the mid-20th century, Nigeria dominated world supply from alluvial workings on the Jos Plateau. Answer: columbite. Why not the others: Wolframite is tungsten ore; Chalcopyrite is copper ore; Chromite is chromium ore.
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