2024 · Paper 1

Complete GATE MN 2024 Paper 1 overview, original pages and practice · Timed previous-paper practice

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

Question 58

Open question

MNNAT2 marksNeeds review

In an open pit mine, the mineral inventory, prices, costs and capacities are given.

Mineral inventory

Grade interval	Tonnage (in million tonne)
0 < Cu% ≤ 0.3	0
0.3 < Cu% ≤ 0.4	5
0.4 < Cu% ≤ 0.5	5
0.5 < Cu% ≤ 0.6	5
0.6 < Cu% ≤ 0.7	5
0.7 < Cu% ≤ 0.8	5
0.8 < Cu%	0

Concentrating cost : INR 3,200/tonne of ore milled Smelting & refinery cost : INR 10,000/tonne of copper metal Selling price : INR 6,50,000/tonne of copper metal Overall recovery : 100% Maximum production capacity : 5 million tonne/annum

The mine is operating at 5 million tonne in a year. Considering mine capacity being the only constraint, Lane’s algorithm (based on profit maximization) is used for determining mill cut-off grade. The total amount of copper produced in million tonne, in the life of the pit, is _____. (round off up to 2 decimals)

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Question 59

Open question

MNNAT2 marksNeeds review

A longitudinal section of a mined out stope block in a copper mine is shown by the shaded portion. For a uniform thickness of the stope block, the percentage of ore recovery is _____. (round off up to 2 decimals)



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Question 60

Open question

MNNAT2 marksNeeds review

The real rate of return from a mining project is 14%. If the inflation rate over the entire life of the mine is 5.5 %, then the nominal rate of return in %, is _____. (round off up to 2 decimals)

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