GATE MN 2026 Paper 1 — page 20

Questions 58–60 of 65. Imported answers require review unless explicitly marked reviewed.

In a bench blasting, as shown, 49 kg of explosive is put in each hole. The detonation time of holes, in millisecond, and the associated scale distance (SD) vs. peak particle velocity (PPV) plot for the given blast pattern is shown. The PPV at a distance of 100 m, in mm s

, is ____________. (rounded off to two decimal places)

Diagram for Mining Engineering question 58

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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)

Diagram for Mining Engineering question 59

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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)

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2026 · Paper 1

Question 58

Question 59

Question 60