Mining Engineer

Mining Engineer Interview Questions and Answers for Freshers

Updated 20 Aug 2024

Q1. Difference between space and burden of blasting

Ans.

Space is the distance between blastholes, while burden is the distance from the blasthole to the free face of the rock.

  • Space is the distance between blastholes in a blast pattern.

  • Burden is the distance from the blasthole to the free face of the rock.

  • Space affects the fragmentation and distribution of the blasted material.

  • Burden influences the amount of energy transferred to the rock mass.

  • Optimal space and burden ratios are crucial for efficient blasting operations.

Q2. What is secondary blasting

Ans.

Secondary blasting is a method used in mining to break up large rocks after the initial blast.

  • Secondary blasting is done to further break down large rocks into smaller, more manageable pieces.

  • It is typically done after the initial blast to maximize the efficiency of the mining operation.

  • Secondary blasting can be done using explosives or mechanical methods such as hydraulic breakers.

  • The goal of secondary blasting is to make the rock fragments easier to handle and transport.

Q3. Types of coal grade

Ans.

Coal grades are categorized based on their carbon content and energy value.

  • Coal grades include lignite, sub-bituminous, bituminous, and anthracite

  • Higher carbon content coal grades have higher energy value

  • Anthracite is the highest grade coal with the highest carbon content and energy value

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