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Component of Asphalt concrete - used in highway construction .... quarry. In contrast, since sand and gravel operations do not usually require sophisticated and expensive crushing equipment, these sites may offer fewer years of reserves and...

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Mining is the extraction of valuable minerals or other geological materials from the earth from ... Quarries for turquoise and copper were also found at Wadi Hamamat, Tura, Aswan and .... Mining in ...

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