In Bronze Age mankind learned to make the alloy of copper and tin. Bronze had the advantage of their greater hardness and durability to the tools and weapons made of stone or copper. In Sumeria began using bronze in the late fourth millennium BC This technological innovation was gradually extended and reached the Iberian Peninsula during the second half of the third millennium BC
The technique involves the use of a charcoal furnace in which they mixed copper (chalcopyrite or malachite) and tin (cassiterite).
The use of tin to manufacture bronze involved an intensification of trade relations because this element was scarce in the Middle East and the mines of cassiterite (tin source) were in the Balkans, Galicia, Brittany and Cornwall.
Also thanks to the production of bronze specialization in metallurgical works intensified and social differences worsened.
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