Terence Bell: The Ancient History of Copper https://www.thebalance.com/copper-history-pt-i-2340112: 'Although various copper tools and decorative items dating back as early as 9000 BC have been discovered, archaeological evidence suggests that it was the early Mesopotamians who, around 5000 to 6000 years ago, were the first to fully harness the ability to extract and work with copper. Lacking modern knowledge of metallurgy, early societies, including the Mesopotamians, Egyptians, and Native Americans, prized the metal mostly for its aesthetic qualities, using it like gold and silver for producing decorative items and ornaments. The earliest organized production and use of copper in different societies have been roughly dated as: Mesopotamia, circa 4500 BC; Egypt, circa 3500 BC; China, circa 2800 BC.... Researchers now believe that copper came of regular use for a period—referred to as the Copper Age—prior to its substitution by bronze. The substitution of copper for bronze occurred between 3500 to 2500 BC in West Asia and Europe, ushering in the Bronze Age...
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