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jewelry , cupronickel used to make marine hardware and coins , and constantan used in strain gauges and thermocouples for temperature measurement. copper is one of the few metals that can occur in nature in a directly usable metallic form ( native metals ). this led to very early human use in several
that contain to % copper. sites include chuquicamata , in chile, bingham canyon mine , in utah, united states, and el chino mine , in new mexico, united states. according to the british geological survey , in , chile was the top producer of copper with at least one-third of the world share followed...
https://en.wikipedia.org/wiki/Copper