The German mining engineer Georgius Agricola (1494-1555) dedicated in his textbook "De re metallica" (1556) an entire chapter to the distribution of valuable rocks in earth's crust. The written ...
According to ancient historians, gold was as common as sand in the kingdom of Egypt. By 3,200 BC public officers, called 'sementi', prospected for deposits and veins of gold to meet the demand of the ...
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