Jewellery uses this formula to work out the mass of copper in green gold
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The following equation was used to calculate copper equivalence: CuEq = Copper (%) + (Gold (g/t) x 0.6319) + (Silver (g/t) x 0.0087) + (Zinc (%) x 0.4167). The following equation was used to calculate gold equivalence: AuEq = (Copper (%) x 1.5824 + Gold (g/t) + (Silver (g/t) x 0.01385) + (Zinc (%) x 0.6593).
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