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Copper and Zinc Composition Percentages in PenniesEssay title: Copper and Zinc Composition Percentages in PenniesCopper and Zinc Composition Percentages in PenniesIntroduction. The United States Mint sends copper and zinc to a fabricator, which creates coin-sized discs called planchets. The planchets undergo the coining press at the Mint where they are stamped as genuine United States.