Mining Engineering
GATE MN topic:mining-methods PYQs
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How to practice topic:mining-methods
Attempt a question, record the concept and assumptions, then check the available answer. Rework mistakes after revising the relevant concepts. Topic tags can overlap; review the question context.
Questions 1–10 of 42. Imported answers require independent review unless marked reviewed.
Question 25
Open questionMNMCQ1 markNeeds review
A 20 m thick orebody is dipping at an angle of 75°. The orebody and host rock are strong. It is proposed to deploy a 150-200 mm diameter drill for production. The suitable stoping method is
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Open questionMNNAT2 marksNeeds review
A regular shaped cut and fill stope is shown. Pillars of size 4 m × 4 m are left at an interval of 13 m along the length of the stope. If the density of the mined ore is 2.5 tonne m
, and slices are extracted to the full stope width, the total tonnage of ore recovered from the 1
slice of the stope is __________ × 10
. (rounded off to one decimal place)
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Open questionMNNAT2 marksNeeds review
A coal seam of 2.4 m thickness is mined with a DERD shearer at a cutting speed of 0.6 km h
. The web depth of the cut is 0.5 m. The average cross-sectional area of coal on the AFC during transportation is 0.24 m
. For the evacuation of cut coal from the face with 10% spillage, the required minimum velocity of the AFC, in m s
, is ____________. (rounded off to two decimal places)Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 61
Open questionMNNAT2 marksNeeds review
A bord and pillar panel has 24 developed pillars of size 40 m × 40 m (centre to centre) under extraction. The following information is given:
Gallery width = 4 m
Extraction height = 3 m
Extraction ratio during depillaring = 80%
Specific gravity of coal = 1.4
Incubation period = 6 months
Average working days per month = 25
In order to extract the panel within the incubation period, the minimum rate of production, in tonne per day, is ______________. (rounded off to one decimal place)
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 12
Open questionMNMCQ1 markNeeds review
A steeply dipping metalliferous ore body is non-susceptible to spontaneous heating. The blasted ore is used as the platform to work in a stope. Appropriate mining method for this orebody is
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Open questionMNNAT1 markNeeds review
In a bord and pillar panel, the following data are obtained
Number of blasting rounds per shift : 8
Face dimension (m × m) : 4.2 × 2.5
Average pull (m) : 1.2
Specific gravity of coal : 1.4
Manpower per shift : 100
The OMS (output per manshift) of the panel, in tonne, is _____ (rounded off to 2 decimal places)
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Open questionMNNAT1 markNeeds review
If the in-situ density of coal is 1320 kg/m
and the density of blasted coal is 952 kg/m
, the swell factor is_____ (rounded off to 3 decimal places)Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 42
Open questionMNMSQ2 marksNeeds review
The CORRECT statement(s) of dragline operation is/are -
Your answerSelect all correct options. You can choose more than one.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 45
Open questionMNNAT2 marksNeeds review
In a sublevel stope, a ringhole blast round is designed for winning 2500 tonne of ore with 8.0 % metal content. The blast results into breakage of 90.0 % of the design blast round. Overbreak of 250 tonne wallrock with 0.5 % metal content dilutes the blasted ore. The total metal content, in tonne, considering 95 % recovery of the blasted muck from the stope, is _______ (rounded off to 2 decimal places)
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 65
Open questionMNNAT2 marksNeeds review
A double ended range drum (DERD) shearer uni-directionally cuts coal in a longwall panel having the following details
Shearer drum diameter = 1.4 m
Panel dimension = 1200 m × 200 m × 2.4 m
Web depth = 0.6 m
Average cutting speed = 5 m/minute
Average retreating speed = 10 m/minute
Average operational delay between cuts is 2 hour. There are two production shifts, each of 8 hour duration. The number of days required for complete extraction of the panel is ____ (in integer)
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