Mining Engineering > GATE 2018 > Surface Mining
In a level terrain, a vertical orebody of 20 m uniform width is worked by surface mining method. The density of the ore is 2.5 tonne/m3. The ultimate pit has a depth of 60 m, width of 20 m at pit bottom, and a pit slope of 45° The overall stripping ratio for this condition in m3/tonne is _____________.
Correct : 1.2
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