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process crushing rock gold refining a vehicle that transfer sand

Cement - Cement -Extraction and processing: Raw materials employed in the manufacture of cement are extracted by quarrying in the case of hardrockssuch as limestones, slates, and some shales, with the aid of blasting when necessary. Some deposits are mined by underground methods. Softerrockssuch as chalk and clay can be dug directly by excavators.

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