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what shape is copper when first mined in costarica

When and how was zinc first mined Yahoo 20032009· Greendawn is correct that the first use of zinc would have been by accident adding zinc minerals to the copper ore during the smelting process would have produced brass instead of pure copper Pure zinc ...As a leading global manufacturer of crushing equipment, milling equipment,dressing equipment,drying equipment and briquette equipment etc. we offer advanced, rational solutions for any size-reduction requirements, including quarry, aggregate, grinding production and complete plant plan.

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