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My best guess would be the bronze age, which was after the stone age, starting in 3000 BC

Humans learned to work soft metals like copper, tin, lead, silver, and gold in ancient times. Later came the alloys brass (copper and zinc) and bronze (copper and tin). The Iron Age replaced the Bronze Age, and when combined with carbon, iron became steel which is used today.

This is an excellent answer but copper was probably the first metal used as it didn't need to be mixed with another metal (Like tin, to make bronze.) and can be found on the surface. It has a relatively low melting point and was probably discovered by accident when the ore was subjected to heat in a fire. The Egyptians used copper chisels for carving stone but I really don't know how long ago that was.

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14y ago

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