Mining Engineering
GATE MN Mine Development PYQs
Build your understanding with focused practice from past exam papers.
How to practice Mine Development
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 40. Imported answers require independent review unless marked reviewed.
Question 17
Open questionMNMCQ1 markNeeds review
The best combination of explosive and initiation system for underwater blasting for rock breakage is
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Open questionMNMCQ1 markNeeds review
The firing sequence in a drivage is shown. The charge per hole for Sections 1, 2, and 3 are 2.0 kg, 3.0 kg, and 1.0 kg, respectively, and the delay between each section is 25 milliseconds. The maximum charge per delay, in kg, is
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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 41
Open questionMNMCQ2 marksNeeds review
Match the shaft sinking method with its applicability.
Shaft sinking method | Applicability |
|---|---|
(P) Piling system | (1) Strata consisting of alternate strong and loose soil, and drum sinks down by its own weight |
(Q) Caison method | (2) Sinking through the loose ground near the surface |
(R) Cementation | (3) Heavily watery strata, including quick sand |
(S) Freezing | (4) Fissured water bearing strata without running sand |
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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 58
Open questionMNNAT2 marksNeeds review
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)
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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 27
Open questionMNNAT1 markNeeds review
An HMX explosive having Velocity of Detonation (VOD) of 10500 m/s is tested by D’Autriche method with a detonating fuse of VOD 7000 m/s, as shown in the figure. The impression mark on lead plate will be obtained at a distance (L), in m, from the mid point of the fuse, is ___ (rounded off to two decimal places)
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Open questionMNNAT2 marksNeeds review
A constant feed of 400 mL/s is maintained by a Xanthe column of height H as shown in the figure. The outlet cross section area is
. The acceleration due to gravity is 10 m/s². Neglecting friction and other losses, the value of H, in cm, 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 46
Open questionMNNAT2 marksNeeds review
In a surface mine, blasting is carried out using electronic detonator and cartridge emulsion explosive with following details:
Burden = 3.5 m
Spacing = 4.5 m
Bench height = 10.0 m
Subgrade drilling = 1.0 m
Stemming = 4.0 m
Linear charge concentration = 16 kg/m
Cost of one detonator = Rs. 800
Cost of explosive = Rs. 30/kg
The cost of blasting material per cubic meter of blasted rock, in Rs., 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 27
Open questionMNNAT1 markNeeds review
An explosive with a density of 1.2 g/cm
has a heat of explosion equal to 900 cal/g. If the heat of explosion of ANFO with density of 0.8 g/cm
is 950 cal/g, the bulk strength of the explosive relative to ANFO is _____. (round off up to 2 decimals)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 34
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In a VCR stope, blast holes of 165 mm diameter are drilled. For the blast hole to behave as a spherical charge, the maximum charge length, in m, is_____. (round off up to 2 decimals)
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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 35
Open questionMNNAT1 markNeeds review
A rectangular development heading of dimension 3 m × 2.8 m is to be blasted with holes of 2.4 m in length. If the pull factor is 0.95 and swell factor is 1.20, the volume of blasted rock per round, in m
, is_______. (round off up to 2 decimals)Log in to check the answer
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