Mining is the extraction of valuable minerals or other geological materials from the earth usually from an orebody, lode, vein, seam, reef or placer deposits.
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WhatsAppعرض المزيدSince the beginning of civilization, people have used stone, ceramics and, later, metals found close to the Earth''s surface. These were used to make early tools and ...
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WhatsAppعرض المزيدSearch metadata Search full text of books Search TV captions Search archived web sites Advanced Search
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