Mining Engineering > GATE 2020 > Mining Methods
A vertical stoping block of length 60.0 m, height 40.0 m, and average width 1.5 m has sharp boundary walls. However, the mining width of the stoping block is 2.0 m. The tonnage factors are 3.0 tonne/m3 for ore and 2.5 tonne/m3 for wall rocks. The average grade of ore is 10.0%. The overall grade of ore mined on account of dilution in percentage is ________.(round off to 2 decimal places).
Correct : 7.70
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