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Mining Engineering Gate 2025 Questions with Answer
Ques 40 GATE 2025
Data from a borehole log with collar elevation at 590 mRL are given below. Composite grade is calculated using cores of 5 m above and below the reference bench at 580 mRL. The composite grade, in %, is ______ (rounded off to 1 decimal place)
| Sequence of cores (top to bottom) | Core length (m) | Grade (%) |
| 1 | 3.0 | 40 |
| 2 | 3.0 | 42 |
| 3 | 2.0 | 41 |
| 4 | 3.0 | 43 |
| 5 | 2.0 | 42 |
| 6 | 3.0 | 41 |
| 7 | 3.0 | 44 |
Ques 41 GATE 2025
The figure below shows four profiles of the environmental lapse rate. Given the dry adiabatic lapse rate = -10°C/km, the atmosphere is highly unstable for the profile
Ques 42 GATE 2025
In a depillaring face of an underground coal mine, both wet and dry bulb temperatures are 30°C. The relative humidity of the face environment, in percentage, is
Ques 43 GATE 2025
Pressure head characteristic of a mine fan and a mine characteristic curves are shown in figure below:
Ques 44 GATE 2025
In a ventilation network, three airways with resistances of 4.0 Ns2m-8, 6.25 Ns2m-8 and 9.0 Ns2m-8 are connected in parallel. The equivalent resistance of the network in Ns2m-8 is ______ (rounded off to 2 decimal places)
Ques 45 GATE 2025
A fixed quantity of air needs to be sent through a cross section, as shown in the figure. The perimeter of the cross section is 20 m. The radius (r) of the semicircle, in m, to minimize the air velocity through the section is
Ques 46 GATE 2025
In a longwall panel, air flows at a velocity of 1.2 m/s through a 900 m long gate road of 2.5 m height and 3 m width. The coefficient of friction is 0.022 Ns2m-4. The frictional pressure drop, in Pa, between two ends of the gate road is ______ (rounded off to 3 decimal places)
Ques 47 GATE 2025
A constant feed of 400 mL/s is maintained by a Xanthate column of height H as shown in the figure. The outlet cross section area is 1.0×10-4 m2. 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)
Ques 48 GATE 2025
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)
Ques 49 GATE 2025
The metal that belongs to Rare Earth Element category is
Ques 50 GATE 2025
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
Ques 51 GATE 2025
Following information are given for three mines of a company receiving explosives from three suppliers.
| Explosive suppliers | Mine-1 | Mine-2 | Mine-3 | Supply capacity (tonne) |
| Supplier - S | 10 | 15 | 50 | 2500 |
| Supplier - O | 5 | 2 | 100 | 2500 |
| Supplier - I | 30 | 40 | 20 | 3000 |
| Explosive demand (tonne) | 1000 | 2000 | 5000 |
Considering the initial basic feasible solution of this transportation problem, using North-West corner method, the transportation cost of explosives supplied to the company, in Rs., is
Ques 52 GATE 2025
The major (σ1) and minor (σ3) principal stresses and the maximum shear stress (τmax) are related as |τmax|=σ1=-σ3.
The magnitude of normal stress on the plane where τmax acts is
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