What topics are covered on Page 3 of GATE 2026 Mining Engineering questions?

Page 3 contains Questions 27 to 39. Topics include metamorphic rocks, UNFC mineral-resource classification, blasting delays, remote sensing, Slake Durability Index, rock permeability, hydraulic props, underground stoping methods, mine ventilation, occupational lung diseases, firedamp explosions, project scheduling and mine airway resistance.

What is the highest category in the UNFC mineral resource classification?

The highest category of mineral resource under the UNFC classification system in the question is 111.

What is the Slake Durability Index in GATE 2026 Mining Engineering?

A 500 g rock sample retains 400 g after two standard wetting and drying cycles. Therefore, its Slake Durability Index is 80 percent.

Which stoping method is suitable for the steep 20 m thick strong orebody?

For the 20 m thick orebody dipping at 75 degrees with strong ore and host rock and using a 150-200 mm production drill, long hole stoping is the suitable method.

What is the stoichiometric methane concentration in a firedamp explosion?

For a stoichiometric methane-air mixture with air containing 21 percent oxygen and 79 percent nitrogen by volume, the methane concentration is 9.5 percent by volume.

What airway diameter is required to double mine airflow at the same pressure loss?

For the underground mine airway described in the question, increasing airflow from 30 to 60 cubic metres per second at the same pressure loss requires an opening diameter of 6.60 m.

Mining Engineering Gate 2026 Questions with Answer

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Ques 27 GATE 2026

Match the type of rock with its metamorphic form.

Igneous/Sedimentary rock	Metamorphic rock
(P) Shale	(1) Gneiss
(Q) Limestone	(2) Quartzite
(R) Granite	(3) Marble
(S) Sandstone	(4) Slate

P→4, Q→3, R→1, S→2

P→3, Q→1, R→4, S→2

P→4, Q→3, R→2, S→1

P→3, Q→4, R→2, S→1

(a) is the correct answer.

Ques 28 GATE 2026

As per the UNFC mineral resources classification system, the highest category of resource is indicated by

111

122

333

334

(a) is the correct answer.

Ques 29 GATE 2026

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

8.0

12.0

20.0

28.0

(b) is the correct answer.

Ques 30 GATE 2026

In remote sensing, the order of the wavelength bands of electromagnetic radiation used for data acquisition is

Visible < Near Infrared < Thermal Infrared < Microwave

Thermal Infrared < Near Infrared < Visible < Microwave

Microwave < Near Infrared < Thermal Infrared < Visible

Near Infrared < Thermal Infrared < Microwave < Visible

(a) is the correct answer.

Ques 31 GATE 2026

In a Slake Durability Index (SDI) test, a rock sample of 500 g undergoes two standard cycles of wetting and drying. The mass of the sample retained after the test is 400 g. The SDI of the sample, in %, is

(d) is the correct answer.

Ques 32 GATE 2026

Results from the permeability test of rock samples, E, F, and G are shown

The correct order of hydraulic conductivity (k) of the rock samples is

k_E > k_F > k_G

k_E < k_F < k_G

k_E = k_F = k_G

k_F > k_G > k_E

(a) is the correct answer.

Ques 33 GATE 2026

The ideal load – deformation characteristic curve of a hydraulic prop is

(d) is the correct answer.

Ques 34 GATE 2026

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

block caving

long hole stoping

shrinkage stoping

post and pillar stoping

(b) is the correct answer.

Ques 35 GATE 2026

A gradually expanding duct fitted to the outlet of an exhaust fan is known as

chimney

diffuser

evasee

equivalent orifice

Ques 36 GATE 2026

The cobweb-like appearance in the radiograph of the lung of a miner can be diagnosed as

silicosis

asbestosis

talcosis

coal workers’ pneumokoniosis

(b) is the correct answer.

Ques 37 GATE 2026

In firedamp explosion, the methane concentration in the stoichiometric methane-air mixture, in % by volume, is
Assume the air contains 79 % nitrogen and 21 % oxygen, by volume.

5.4

9.5

10.8

14.8

(b) is the correct answer.

Ques 38 GATE 2026

The expected time (P days) and standard deviation (Q days) of the different activities (A to F) in a project are indicated in the network diagram as (P, Q). The standard deviation of the project completion time, in days, is __________. (rounded off to one decimal place)

(3.0) is the correct answer.

Ques 39 GATE 2026

In an underground mine, an airflow of 30 m³ s^-1 is delivered through a circular opening having a diameter of 5 m and a length of 500 m. Assuming that there is no change in the surface characteristics, the diameter of the opening, in m, required to double the quantity of airflow at same pressure loss is _______________. (rounded off to two decimal places)

(6.60) is the correct answer.

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