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Electromagnetic separation is employed in the beneficiation of which ore?

1. Copper pyrites
2. Bauxite
3. Cassiterite
4. Cinnabar

Correct answer: Cassiterite

Solution

Cassiterite (tin stone, SnO2) is non-magnetic but is associated with magnetic wolframite (FeWO4) impurities, so the two are separated by electromagnetic (magnetic) separation. Copper pyrites is concentrated by froth flotation, not magnetic separation.

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