GATE MN topic:mine-planning PYQs & Answers — Page 2

Questions 11–20 of 28. Imported answers require independent review unless marked reviewed.

Identify the WRONG statement:

Break-even striping ratio

Your answerChoose one option.

takes into account the maximum pit slope that is safe

helps in determining the volume of the overburden

presents the maximum possible mine size that is economical

takes into account the life of the mine

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The correct order of pavement layers for a haul road from top to bottom is

Your answerChoose one option.

Wearing course → Base → Sub base → Sub grade

Wearing course → Sub base → Base → Sub grade

Wearing course → Sub grade → Sub base → Base

Wearing course → Base → Sub grade → Sub base

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Match the semi-variogram shape with the model name and the property.

Shapes P, Q, R and S; models I Pure nugget, II Exponential, III Spherical, IV Gaussian; properties E reaches sill at finite range, F reaches sill asymptotically, G reaches sill instantaneously.

= semi-variogram;

= lag distance.

Diagram for Mining Engineering question 39

Your answerChoose one option.

P→III→E, Q→II→F, R→IV→E, S→I→G

P→II→F, Q→I→G, R→III→E, S→IV→E

P→IV→G, Q→III→F, R→II→E, S→I→E

P→II→E, Q→I→E, R→III→F, S→IV→G

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A coal seam of uniform thickness 12 m is dipping at an angle 30° as shown in the figure. The ultimate pit is demarcated based on allowable instantaneous stripping ratio of 10 m³/tonne and safe slope angle of 45°. The density of coal is 1.41 tonne/m³. The length, L in m is ______. (round off to two decimal places)

Diagram for Mining Engineering question 63

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A mine has a reserve of 150 million tonne (Mt) and is designed for a maximum production capacity of 5 Mt per year. In the first year the production is 2 Mt and it increases by 20% each year. The reserve in Mt that remains at the end of 15 years, is ______. (round off to two decimal places)

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Production plan of a small quarry having 3 years of life is shown in the figure.

Diagram for Mining Engineering question 37

The following information of revenue and cost data are available. Ore: 3.0 million tonne each year; waste: 5.0 million m³ in the 1st year, 5.5 million m³ in the 2nd year, and 5.0 million m³ in the 3rd year. Selling price of ore = Rs. 150/tonne. Ore mining cost = Rs. 500/tonne. Waste mining cost = Rs. 500/m³. Initial capital = Rs. 1000 million. Discount rate = 10%. By neglecting depreciation, salvage value and corporate tax, the NPV of the mining project, in million Rs., is ______. [round off to 2 decimal places]

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The grade-tonnage distribution for the ultimate pit of a mine is given below.

Cu grade (%)	Cumulative million tonnes below the grade
0.1	0
0.4	15.0
0.5	17.0
0.6	18.0
0.7	19.0
0.9 and above	23.0

The mill cut-off grade is 0.5 % Cu. The annual mining capacity (ore + waste) is 4.5 million tonne and milling capacity is 1.0 million tonne. Excavation is planned in such a way that either of the mine or the mill runs at full capacity throughout. The planned life of the mine, in years, is ______. [round off to one decimal place]

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Match the following sampling patterns with the corresponding sampling types.

Sampling patterns: P, Q, R, S

Diagram for Mining Engineering question 14

Sampling Pattern	Sampling Type
P	1 — Regular
Q	2 — Biased
R	3 — Stratified random
S	4 — Random

Your answerChoose one option.

P - 1, Q - 3, R - 2, S - 4

P - 1, Q - 3, R - 4, S - 2

P - 1, Q - 2, R - 3, S - 4

P - 4, Q - 2, R - 1, S - 3

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A vertical stope block of length 60.0 m, height 40.0 m, and average width 1.5 m has sharp boundary walls. However, the mining width of the stope block is 2.0 m. The tonnage factors are 3.0 tonne/m

for ore and 2.5 tonne/m

for wall rocks. The average grade of ore is 10.0%. The overall grade of ore mined on account of dilution in percentage is ________ (round off to 2 decimal places).

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A bauxite ore body has four boreholes as shown below. For each borehole, the grade of alumina, the thickness of the ore body, and the triangular area of influence are shown.

Diagram for Mining Engineering question 55

The average grade of ore body in the region ABCD in percentage is ________ (round off to 1 decimal place).

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GATE MN topic:mine-planning PYQs

Question 18

Question 27

Question 39

Question 63

Question 64

Question 37

Question 53

Question 14

Question 54

Question 55