Mining Engineering > GATE 2018 > Mining Methods
In a sublevel stope, 20 m high excavation is made with ring drilling in a 6 m wide orebody. In an effective shift time of 6 hrs, three rings are blasted resulting in 9 m extraction length. LHDs of 5.0 m3 bucket capacity and cycle time of 5 minutes are used for ore transportation. The number of LHDs required for this operation is __________.
Explanation
Correct : 3.0
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