A vertical ore body having a consistent width of 100 m has been excavated by the open pit method up to a depth of 100 m at a pit slope angle of 45°. The figure shows the cross section of the open pit. If the ore body is further excavated by a depth of 10 m, maintaining the same pit slope angle, the ratio of waste rock to ore is
A. 1.2
B. 2.1
C. 3.0
D. 3.9
Answer: Option B
This Question Belongs to Mining Engineering >> Introduction To Mining Engineering
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