GATE MN topic:mining-methods PYQs & Answers — Page 2

Questions 11–20 of 42. Imported answers require independent review unless marked reviewed.

Match the method of mining with orebody geometry, orebody strength and type of supports.

Geometry	Strength	Support	Method
P. Tabular & Moderately Steep Q. Tabular & Flat R. Massive and Steep	L. Strong M. Moderate N. Weak	X. Unsupported Y. Artificially Supported Z. Self-supported	1. Cut and Fill 2. Block Caving 3. Room and Pillar

Your answerChoose one option.

P→L→Y→3; Q→N→Z→1; R→M→X→2

P→M→Y→2; Q→N→Z→1; R→L→X→3

P→L→Y→2; Q→M→Z→3; R→N→X→1

P→M→Y→1; Q→L→Z→3; R→N→X→2

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A longitudinal section of a mined out stope block in a copper mine is shown by the shaded portion. For a uniform thickness of the stope block, the percentage of ore recovery is _____. (round off up to 2 decimals)

Diagram for Mining Engineering question 59

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For a continuous miner (CM) panel, the following data are given.

Data related to CM

Dimension of a working face: 5.0 m (width) x 3.0 m (height) Web depth, m: 0.6 Time for one web cut up to full height, min: 9

Data related to shuttle car

Bucket capacity of shuttle car, tonne: 10 Fill factor: 0.9 Number of cars: 2 Cycle time of each including loading, travel and unloading, min: 6

Assume, unit weight of coal is 1.4 tonne/m³ and its swell factor is 1.2. Consider, 6 working hours per shift.

The non-working time in min, in working hours per shuttle car to dispatch all coal cut by the CM, is _____. (round off up to 2 decimals)

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A tabular, near-flat (dip < 30°), and less than 2 m thick copper orebody having erratically located grade is to be mined underground. Wall rock and orebody are competent. The most suitable mining method is

Your answerChoose one option.

Cut and fill stoping.

Sub-level stoping.

Underhand open stoping.

Breast stoping.

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Data related to a surface miner operation are given below - Drum width (m) = 3.0 Average cutting depth (cm) = 20 Average cutting speed (m/min) = 25 Length of pit (m) = 500 Turning time (min) = 2 Truck exchange time (s) = 30 Truck capacity (m³) = 15

Considering in situ volume, the production rate of the surface miner in m³/hr, is _____.

[rounded off to 1 decimal place]

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A continuous miner served by two shuttle cars produces 240 tonne/hr. The capacity of each shuttle car is 10 tonne. When a single shuttle car operates, the cycle time becomes 4 min. In case one of the shuttle cars is under break-down, the reduction in hourly production from that of two cars in percent is _____.

[rounded off to 1 decimal place]

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The bottom section of a stope block has dimensions 200 m × 40 m. If the modified RMR of rock mass is 50, the appropriate method of mining on the basis of Laubscher’s chart in the figure is

Diagram for Mining Engineering question 22

Your answerChoose one option.

Shrinkage stoping

Cut and fill

Block Caving

Sublevel stoping

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Match the drilling pattern with mining operation

Diagram for Mining Engineering question 36

Your answerChoose one option.

P→II, Q→III, R→I, S→II

P→II, Q→IV, R→I, S→II

P→II, Q→I, R→IV, S→II

P→II, Q→IV, R→II, S→I

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In a longwall face, the full seam thickness of 3 m is cut by a shearer with a web of depth 0.7 m. The hauling speed of shearer during cutting is 12 m/min. The trough cross-section of AFC is 0.4 m² and the average loading coefficient is 0.7. In order to evacuate coal from the face without spillage, the speed of AFC, in m/s is ______. (round off to one decimal place)

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Reusing method of mining is practiced for

Your answerChoose one option.

thick vein deposit.

massive shallow deposit.

narrow vein deposit.

massive deep-seated deposit.

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GATE MN topic:mining-methods PYQs

Question 42

Question 59

Question 64

Question 20

Question 45

Question 46

Question 22

Question 36

Question 55

Question 2