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Production of zinc from ores and concentrates
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Electrolytic cell for recovery of metals from metal bearing materials
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Silver and gold recovery process from mines and concentrates
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Recovery of silver and gold from ores and concentrates
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Recovery of silver and gold from ores and concentrates
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Recovery of silver and gold from ores and concentrates
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Recovery of silver and gold from ores and concentrates
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Recovery of silver and gold from ores and concentrtes
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Recovery of silver and gold from ores and concentrates.
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Production of lead from ores and concentrates
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Production of lead from ores and concentrates
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Production of lead from ores and concentrates
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Recovery of copper from ores and concentrates
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Refining of ferrous and base metal ores and concentrates
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Production of base metals from ores and concentrates
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Method of gaining the copper from the ore or concentrate
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Process for the production of metals from ox and concentrates
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Process for the extraction of copper from ores and concentrates
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Extraction of copper from ores and concentrates
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Procedure for the mining of copper from copper and iron ore or concentrate
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