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Open pit mining is a technique used to extract copper ore near the earth s surface Open pit mining is the most widely used technique of mining copper today It is accomplished by creating and using benches or terraces to gradually reach deeper under the earth s surfaceDETERMINATION OF SHOVEL TRUCK PRODUCTIVITIES IN OPEN PIT MINES NGUYEN Hoang1 DOAN Trong Luat2 LE Thi Thu Hoa1 DO Ngoc Hoan1 PHAM Van Viet1

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