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Kendal Rosario
7 November, 12:14
How is sand and gravel extracted?
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Lillian Koch
7 November, 15:59
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Industrial sand and gravel typically are mined from open pits of naturally occurring quartz-rich sand and sandstone. Mining methods depend primarily on the degree of cementation of the rock. In some deposits, blasting is required to loosen the material prior to processing ... The material then is crushed.
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