Which method of mining is used, when the seams of coal lie to far belo

1.	Which method of mining is used, when the seams of coal lie to far below the surface?
A.	Deep mining
B.	Opencast mining
C.	Deep and open cast mining
D.	Drilling
Answer» B. Opencast mining

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Which method of mining is used, when the seams of coal lie to far below the surface?

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