10+ Mining Overman Interview Questions and Answers

The maximum width of the gallery in Indian coal mines varies depending on the specific mine and its regulations.

• The maximum width of the gallery is determined by safety regulations and guidelines set by the Indian government.

• Different coal mines may have different maximum width requirements based on factors such as the type of coal being mined, the depth of the mine, and the mining method used.

• For example, in underground longwall mining, the gallery width may range from 3 to ...read more

The suitable bench height for a 2cu.m shovel depends on various factors such as the type of material being mined and the equipment used.

• The bench height should be determined based on the reach and capacity of the shovel.

• It should allow for efficient loading and dumping of material.

• The bench height should also consider the stability and safety of the mining operation.

• Factors like the type of material, equipment limitations, and slope stability analysis should be considered.

• For...read more

The output capacity of the dragline with 4.5 to 7.5 cu.m is in million cu.m per year.

• The output capacity of the dragline depends on the size of the bucket it uses.

• A larger bucket size allows for a higher output capacity.

• The dragline's efficiency and operating conditions also affect its output capacity.

• The output capacity can be calculated by considering the average number of cycles per hour and the bucket fill factor.

• For example, if the dragline completes 10 cycles per hour w...read more

Useful machinery for surface mining includes surface miner, dozer, ripper dozer, bucket wheel excavator, rope shovel, and hydraulic shovel.

• Surface miner is used for cutting and crushing rocks and minerals on the surface.

• Dozer is used for pushing and moving large quantities of earth and rocks.

• Ripper dozer is used for breaking up hard soil and rocks.

• Bucket wheel excavator is used for continuous digging and loading of materials.

• Rope shovel is used for digging and loading large q...read more

A sheathed explosive is coated with a protective covering.

• The sheath provides a layer of protection to the explosive material.

• The sheath can be made of materials like plastic or rubber.

• The purpose of the sheath is to prevent accidental ignition or detonation.

• Examples of sheathed explosives include dynamite and blasting caps.

The VOD of emulsion explosive refers to its Velocity of Detonation.

• VOD is a measure of how fast the explosive reaction propagates through the material.

• It is an important characteristic for determining the efficiency and safety of explosive materials.

• Higher VOD explosives are typically used for blasting hard rock formations.

• Lower VOD explosives are used in situations where a controlled and less destructive explosion is required.

There are various types of explosives used in mining, along with different types of detonators.

• Types of explosives include dynamite, ammonium nitrate fuel oil (ANFO), and emulsion explosives.

• Detonators can be electric, non-electric, or electronic.

• Examples of detonators include blasting caps, shock tubes, and electronic delay detonators.

The gelling agent in slurry explosive is typically a mixture of water and a thickening agent.

• The gelling agent is used to increase the viscosity of the explosive mixture.

• Common thickening agents used in slurry explosives include guar gum, carboxymethyl cellulose (CMC), and xanthan gum.

• The gelling agent helps to suspend solid particles in the explosive mixture, allowing for better distribution and control of the explosive energy.

• The choice of gelling agent depends on factors s...read more

There are 100 centimeters in 1 meter.

• 1 meter is equal to 100 centimeters.

• Centimeter is a unit of length in the metric system.

• To convert meters to centimeters, multiply the length in meters by 100.

Detonating fuse consists of a core

• The core of a detonating fuse is the central part that initiates the explosion

• The core is typically made of a highly reactive material, such as a mixture of powdered metals or chemicals

• The core is surrounded by a protective casing to prevent accidental ignition

• Examples of core materials include lead azide, mercury fulminate, or PETN

A.D - Anno Domini, B.C - Before Christ, A.M - Ante Meridiem, P.M - Post Meridiem

• A.D stands for Anno Domini which means 'In the year of our Lord' and is used to indicate years after the birth of Jesus Christ.

• B.C stands for Before Christ and is used to indicate years before the birth of Jesus Christ.

• A.M stands for Ante Meridiem which means 'Before noon' and is used to indicate time in the morning.

• P.M stands for Post Meridiem which means 'After noon' and is used to indicate time...read more

The VOD of detonating fuse is the velocity at which the detonation wave travels along the fuse.

• VOD stands for Velocity of Detonation.

• It is a measure of how fast the detonation wave propagates through the fuse.

• The VOD of a detonating fuse depends on factors such as the type of explosive used and the composition of the fuse.

• A higher VOD means the detonation wave travels faster, resulting in a quicker explosion.

• Different types of detonating fuses may have different VOD values.

Coal pillars are left in underground mines to support the roof and prevent collapse.

• Pillar height is determined by the depth of the mine and the strength of the surrounding rock.

• Higher pillars provide more support but also leave less coal to be extracted.

• Pillar failure can lead to roof collapse and endanger miners.

• Proper pillar design and maintenance is crucial for safe and efficient mining operations.