Mining Engineer Interview Questions and Answers for Freshers

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.

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.

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