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Sulphide ores of metals are usually concentrated by froth flotation process. Which one of the following sulphide ores offer an exception and concentrated by chemical leaching?

1. Galena
2. Copper pyrite
3. Sphalerite
4. Argentite

Correct answer: Argentite

Solution

Argentite (Ag2S) is concentrated by chemical leaching using a cyanide solution, unlike most sulphide ores that are concentrated by froth flotation.

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