Search for: [Abstract = "Ongoing research in the Nile valley, between Asyut and Qena, by the Belgian Middle Egypt Prehistoric Project of Leuven University has led to the discovery of a high number of Palaeolithic chert exploitation sites. Field evidence indicates that from the Acheulean on, man extracted chert from pits. During the Middle Palaeolithic, extraction ditches were introduced, while during the early Upper Palaeolithic period underground mining was practised"]

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