1 янв 5500 г. до нашей эры - Copper smelting

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"copper, which people hammered into shapes for jewelry and tools....by about 5500 B.C.E., people in the Balkans had learned that copper could be extracted from ore by heating it in a smelting process. Smelted copper was poured into molds and made into spear points, axes, chisels, beads, and other objects. Pure copper is soft, but through experimentation artisans learned that it would become harder if they mixed it with other metals during heating, creating an alloy called bronze."

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