Electromagnetic separation is employed for the concentration of those ores in which:

the ore is magnetic

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the gangue is magnetic

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both the ore and the gangue are magnetic

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either the ore or the gangue is magnetic

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Solution

The correct option is D either the ore or the gangue is magnetic
Electromagnetic separation. A process of removing magnetic materials from relatively nonmagnetic materials, using electromagnets which travel along a conveyor, over a drum, or into a revolving screen.

So, from gangue and ore, one of them must be a magnetic material and other must be non-magnetic.

Option D is correct.

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