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Mineral prices (reference) >>> Copper: US$ 7.632 (Kg.) / US$ 3.462 (Lb.) - Zinc: US$ 2.133 (Kg.) / US$ 0.968 (Lb.) - Tin: US$ 21.450 (Kg.) / US$ 9.730 (Lb.) - Nickel: US$ 21.875 (Kg.) / US$ 9.922
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