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Silver Ore Flotation Raw Silver

laboratory tests were made in the united states and in sumatra, followed by plant-scale runs in the latter country and a 50-ton plant at pachuca, mexico.Direct cyanidation of raw ore containing 2 to 10 per cent mno2 gave 50 per cent extraction of the silver, but ore with 25 per cent mno2 gave only 25 per cent extraction.

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