300s CE onward · Africanspan
In most of Africa iron came first and copper came after
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Textbooks teach a sequence for metals in which copper comes first and iron follows long after, because that is how it went in Europe and the Middle East. South of the Sahel the order runs the other way. Iron smelting was established across two thirds of Africa before copper was worked at all, and knowing how to hold a furnace at heat is what led people to recognise copper ores and smelt them. The clearest case is the belt of copper rich country running from central Zambia into the southern Congo. Bantu speakers of the Sabi group began working those ores no later than the fourth century CE, several centuries after iron reached them. Copper and copper goods then moved out along the Zambezi watershed and up the rivers into the Congo basin. From about the eighth century a further set of Bantu communities spread through the same region, their speech ancestral to the Luba dialects heard there now, and the older Sabi language fell out of use while the mines kept growing.
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