Mining Engineering Diploma Interview Questions & Answers | EngineerX
Mining Engineering (Diploma / Polytechnic) Interview Questions & Answers — commonly asked polytechnic diploma interview and campus placement questions with clear, practical answers. Tap any question to open its answer.
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Mining Engineering — Diploma Interview Q&A
Q1What is Mining Engineering?
AnswerMining Engineering is the branch of engineering concerned with the exploration, extraction, processing and management of minerals and other valuable geological resources from the Earth. It combines geology, mechanical engineering, electrical engineering, safety and environmental engineering.
Q2What is a mineral?
AnswerA mineral is a naturally occurring inorganic substance having a definite chemical composition and an ordered atomic structure. Examples include coal, iron ore, bauxite, limestone and copper minerals.
Q3What is an ore?
AnswerAn ore is a naturally occurring mineral deposit from which a valuable metal or mineral can be extracted economically using available technology. For example, hematite is an important ore of iron.
Q4What is mining?
AnswerMining is the process of extracting valuable minerals, ores, coal or other geological materials from the Earth's crust. It may be carried out through surface mining or underground mining depending on the deposit and economic conditions.
Q5What are the major types of mining?
AnswerThe two major categories are surface mining and underground mining. Surface mining includes open-cast/open-pit mining, quarrying and strip mining, while underground mining uses shafts, tunnels and other underground workings.
Q6What is surface mining?
AnswerSurface mining is the extraction of minerals by removing the overlying soil and rock, called overburden, to expose the mineral deposit. It is commonly used when the deposit is relatively close to the surface.
Q7What is underground mining?
AnswerUnderground mining is the extraction of minerals from deposits located deep below the surface. Access is provided through shafts, declines, adits and underground roadways.
Q8What is an open-cast mine?
AnswerAn open-cast mine is a surface mine in which minerals are extracted from a large excavation called a pit. Overburden is removed using equipment such as excavators, dumpers and dozers.
Q9What is overburden?
AnswerOverburden is the soil and rock material lying above a mineral deposit that must be removed before the mineral can be extracted. It normally has little or no economic value in the mining operation.
Q10What is waste rock?
AnswerWaste rock is rock excavated during mining that does not contain sufficient valuable mineral to be economically processed. It is generally transported to designated waste dumps or used for suitable mine-development purposes.
Q11What is stripping ratio?
AnswerStripping ratio is the quantity of overburden or waste that must be removed to obtain a given quantity of useful mineral. It is an important economic parameter in surface mining.
Q12What is benching in open-cast mining?
AnswerBenching is the method of dividing the mine excavation into a series of horizontal or near-horizontal levels called benches. Benches improve slope stability, provide working space and facilitate drilling, blasting, loading and transportation.
Q13What is a bench?
AnswerA bench is a step-like working level formed in an open-cast mine. It generally consists of a bench face, bench floor and berm, and its dimensions depend on geological and operating conditions.
Q14What is a berm in mining?
AnswerA berm is a horizontal strip or ledge provided along a mine slope or bench. It helps catch falling material, improves slope safety and can provide separation between working levels.
Q15What is bench height?
AnswerBench height is the vertical distance between the top and bottom levels of a bench. It is selected based on factors such as rock properties, excavation equipment, drilling capacity and slope stability.
Q16What is bench width?
AnswerBench width is the horizontal distance available between the bench face and the corresponding edge or safety limit. Adequate width is required for safe movement and operation of mining equipment.
Q17What is a haul road?
AnswerA haul road is a specially constructed road used for transporting ore, waste and materials within a mine. Its gradient, width, drainage, surface condition and turning radius must be designed according to the vehicles being used.
Q18What is drilling in mining?
AnswerDrilling is the process of creating holes in rock using drilling equipment. In blasting operations, these holes are charged with explosives to fragment the rock.
Q19Why is drilling required before blasting?
AnswerDrilling creates properly positioned holes into which explosives can be placed. The location, diameter, depth and spacing of the holes strongly influence fragmentation and blasting performance.
Q20What is blasting?
AnswerBlasting is the controlled fragmentation of rock using explosives. In mining, it is performed according to a designed blast pattern while considering fragmentation, vibration, flyrock, noise and safety.
Q21What is a blast hole?
AnswerA blast hole is a drilled hole made in rock for placing explosive charges. Its diameter, depth, spacing and burden are selected according to the rock conditions and blasting design.
Q22What is burden in blasting?
AnswerBurden is the shortest distance between a blast hole and the free face of the rock or between appropriate rows of blast holes. Correct burden is essential for achieving effective rock fragmentation.
Q23What is spacing in blasting?
AnswerSpacing is the distance between adjacent blast holes in the same row. Proper spacing helps distribute explosive energy uniformly throughout the rock mass.
Q24What is stemming in blasting?
AnswerStemming is the inert material placed in the upper portion of a blast hole after charging. It helps confine the explosive gases and directs more energy into rock fragmentation rather than allowing gases to escape upward.
Q25What is fragmentation?
AnswerFragmentation is the breaking of rock into smaller pieces during blasting or mechanical excavation. Good fragmentation produces material of a suitable size for loading, transportation and subsequent crushing.
Q26What is muck in mining?
AnswerMuck refers to the fragmented rock or mineral produced after blasting or excavation. It is loaded and transported to the processing plant, stockpile or waste dump depending on its nature.
Q27What is mucking?
AnswerMucking is the process of loading and removing blasted or excavated material from a mining area. Equipment such as loaders, LHDs, shovels and excavators can be used depending on the mining method.
Q28What is an LHD?
AnswerLHD stands for Load-Haul-Dump. It is an underground mining machine designed to load broken material, transport it over relatively short distances and dump it at a designated location.
Q29What is a dragline?
AnswerA dragline is a large surface-mining machine that uses a long boom and a suspended bucket to excavate and move material. It is particularly useful for removing large quantities of overburden in suitable surface-mining operations.
Q30What is a hydraulic excavator?
AnswerA hydraulic excavator uses hydraulic cylinders and hydraulic motors to operate the boom, arm, bucket and machine movements. It is widely used for digging, loading and material handling in mines.
Q31What is a shovel in mining?
AnswerA mining shovel is a large excavation and loading machine used to dig and load blasted rock into haul trucks. Electric rope shovels and hydraulic shovels are common in large surface mines.
Q32What is a dump truck in mining?
AnswerA dump truck is a haulage vehicle used to transport ore, waste rock and other materials. Large mining trucks have high payload capacity and are designed for operation on mine haul roads.
Q33What is a dozer used for in mining?
AnswerA dozer, or bulldozer, is mainly used for pushing and spreading material, road maintenance, site preparation, stockpile management and other earthmoving activities. It can also assist in maintaining working areas and dumps.
Q34What is a wheel loader?
AnswerA wheel loader is a mobile machine equipped with a front-mounted bucket used for loading and handling loose material. It is commonly used around stockpiles, crushers, construction areas and smaller mining operations.
Q35What is a crusher?
AnswerA crusher is a machine used to reduce the size of mined material by applying mechanical forces such as compression or impact. Common types include jaw crushers, cone crushers and impact crushers.
Q36What is primary crushing?
AnswerPrimary crushing is the first major stage of size reduction after the material is mined. Large rocks are reduced to a smaller size suitable for secondary crushing or further processing.
Q37What is a jaw crusher?
AnswerA jaw crusher reduces rock mainly by compression between a fixed jaw and a moving jaw. It is commonly used for primary crushing because it can handle relatively large feed sizes.
Q38What is a cone crusher?
AnswerA cone crusher reduces material mainly by compression between a rotating mantle and a stationary concave. It is commonly used for secondary and tertiary crushing and can produce relatively well-controlled product sizes.
Q39What is screening in mining?
AnswerScreening is the process of separating particles according to size using a screen or vibrating screen. It allows correctly sized material to proceed while oversize particles can be returned for further crushing.
Q40What is a conveyor belt used for in mining?
AnswerA conveyor belt is used for continuous transportation of bulk materials such as coal, ore and overburden. Compared with truck haulage, conveyors can provide efficient continuous material movement over suitable routes.
Q41What is a mine shaft?
AnswerA mine shaft is a vertical or near-vertical opening constructed to provide access to underground workings. It can be used for transporting personnel, materials, ore and waste and for ventilation or services.
Q42What is a decline in underground mining?
AnswerA decline is an inclined underground passage that connects the surface with underground workings. It is commonly used for movement of mining equipment, personnel and materials.
Q43What is an adit?
AnswerAn adit is a nearly horizontal underground passage driven from the surface into a mine. It can provide access, drainage, transportation or ventilation where the terrain and deposit geometry permit.
Q44What is a level in underground mining?
AnswerA level is a horizontal underground working horizon from which mining activities are carried out. Levels may be connected by shafts, raises, declines or other underground openings.
Q45What is a raise?
AnswerA raise is an underground opening driven upward from one level toward another. It can be used for ventilation, ore transfer, access or connecting different underground workings.
Q46What is mine ventilation?
AnswerMine ventilation is the controlled circulation of fresh air through underground mine workings. It supplies oxygen, removes contaminants such as dust and harmful gases, controls heat and humidity, and provides a safe working atmosphere.
Q47Why is ventilation important in underground mines?
AnswerUnderground mines can accumulate hazardous gases, dust, heat and insufficient oxygen. Proper ventilation maintains acceptable air quality and helps protect workers from health and fire/explosion hazards.
Q48What is mine surveying?
AnswerMine surveying involves measuring and mapping mine workings, surface features and underground structures. It helps determine positions, elevations, mine boundaries, excavation progress and accurate mine plans.
Q49What is mine safety?
AnswerMine safety involves procedures, equipment, training and engineering controls used to prevent accidents, injuries and occupational hazards. Major areas include ground control, ventilation, machinery safety, blasting safety, electrical safety and emergency preparedness.
Q50What are the major hazards in mining?
AnswerMajor mining hazards include ground falls, mine fires, explosions, toxic gases, dust exposure, machinery accidents, electrical hazards, blasting incidents, water inundation and haul-road accidents. Effective risk assessment, engineering controls, safe operating procedures, training and regulatory compliance are essential for controlling these hazards.
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