31. The method of mining which involves the removal of the overlaying materials to extract the minerals from shallow depth is known as..a) Miningb) Drillingc) Open Cast Mining d) Digging boar wells

31. The method of mining which involves the removal of the overlaying

1.	31. The method of mining which involves the removal of the overlaying materials to extract the minerals from shallow depth is known as..a) Miningb) Drillingc) Open Cast Mining d) Digging boar wells
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