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A less harmful approach for the environment regarding chalcopyrite concentrate leaching, using seawater/brine and caliche's salts as a source of chloride and nitrate ions, was investigated. Different variables were evaluated: sulfuric acid concentration, sodium nitrate concentration, chloride concentration, source of water (distilled water, seawater, and brine), temperature, concentrate sample type, nitrate source (analytical grade and industrial salt), and pre-treatment methods in order todoi:10.3390/min10050477 fatcat:hs6kzf3ssjcghcph56sjhumrz4