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Questions and Answers
What is a method of mining for surface highwall or outcrop recovery of coal by boring or excavation openings?
What is a method of mining for surface highwall or outcrop recovery of coal by boring or excavation openings?
- Drift mining
- Auger mining (correct)
- Single bench mining
- Strip mining
The amount of oxygen in underground mines required under the 'Revised Mines Safety Rules and Regulations' is:
The amount of oxygen in underground mines required under the 'Revised Mines Safety Rules and Regulations' is:
- 20% by volume
- 18% by volume
- 21% by volume
- 19% by volume (correct)
In planning and development, what is the main factor for determining the bench height in an open pit?
In planning and development, what is the main factor for determining the bench height in an open pit?
- Volume of material to be blasted
- Blast pattern design (correct)
- Subrill
- Equipment specification
- Groundwater conditions
What occurs when an obstruction to the flow is encountered and the velocity of the medium is great enough?
What occurs when an obstruction to the flow is encountered and the velocity of the medium is great enough?
What is the importance of defining the pit limit?
What is the importance of defining the pit limit?
What is the underground mine gas otherwise called as 'white damp'?
What is the underground mine gas otherwise called as 'white damp'?
Refers to the timbering or concrete around the mouth or top of a shaft?
Refers to the timbering or concrete around the mouth or top of a shaft?
Cut and fill stoping, shrinkage stoping, VCR stoping, and long-wall mining are methods that are:
Cut and fill stoping, shrinkage stoping, VCR stoping, and long-wall mining are methods that are:
How many drivers are required for a mining company that operates 10 dump trucks, running 24 hours a day in a 2-shift schedule?
How many drivers are required for a mining company that operates 10 dump trucks, running 24 hours a day in a 2-shift schedule?
What is the condition of the surrounding rock in in-situ mining?
What is the condition of the surrounding rock in in-situ mining?
Underground mining method used to extract mineral deposits that are roughly tabular, strong, flat or steeply dipping, and generally in contact with strong wall rock?
Underground mining method used to extract mineral deposits that are roughly tabular, strong, flat or steeply dipping, and generally in contact with strong wall rock?
A type of anemometer suitable for measuring very high velocities than special anemometers?
A type of anemometer suitable for measuring very high velocities than special anemometers?
All unit operations involved in excavating or moving bulk minerals during mining are?
All unit operations involved in excavating or moving bulk minerals during mining are?
Mine gas produced as a result of poor blasting is?
Mine gas produced as a result of poor blasting is?
An overhand method in which the ore is mined in horizontal slices and remains in the slope as a temporary support for the walls is?
An overhand method in which the ore is mined in horizontal slices and remains in the slope as a temporary support for the walls is?
The concept of replacing the intermittent operations of rock breakage and material handling in mining with a system of continuous extraction is?
The concept of replacing the intermittent operations of rock breakage and material handling in mining with a system of continuous extraction is?
Study Notes
Mining Methods
- Auger mining: Surface mining method for coal extraction from highwalls or outcrops via boring or excavation.
- Drift mining: A surface mining method (the question is unclear if this is meant to be an underground method).
- Strip mining: A surface mining method of coal extraction.
- Single bench mining: A surface mining method (the question is unclear about its specifics).
- Cut and fill stoping, shrinkage stoping, VCR stoping, and long-wall mining: Artificially supported underground mining methods.
- Overhand cut-and-fill stoping, sublevel caving, shrinkage stoping, and stull stoping: Underground mining methods involving overhead extraction and slice mining.
- In-situ leaching: An underground mining method suitable for deposits that are roughly tabular, strong, flat or steeply dipping and generally in contact with strong wall rock.
- Top slicing: An overhead mining method where ore is mined in horizontal slices.
Mine Ventilation
- Required oxygen level in underground mines: 19% by volume.
- Turbulent flow: Occurs when an obstruction is encountered, and velocity is high enough.
- Anemometer types: Vane anemometers, Velometers, Pitot tube apparatus, and Indicating anemometers measure air velocity; Pitot tubes are suitable for high velocities.
Open Pit Mining
- Bench height determination in open pit mining: Primarily depends on equipment specifications. Blast pattern design, groundwater conditions, and the volume of material to be blasted are also important factors.
- Pit limit definition importance: Determines minable ore quantity, equipment needs, cut-off grade, and mine lifespan.
Underground Mining
- Shaft collar: Timbering or concrete around the top of a shaft.
- Consolidated rock: Describes the surrounding rock condition in in-situ mining.
- Mine gas identification: Nitrogen dioxide, methane, hydrogen sulfide, and carbon monoxide are mine gases; nitrogen is sometimes referred to as "white damp".
Materials Handling and Equipment
- Number of dump truck drivers needed: Calculation depends on truck numbers (10), 24-hour operation, two shifts, 85% mechanical availability, and 10% manpower availability; the correct answer is not provided.
Other Mining Aspects
- Mine gas from poor blasting: Carbon monoxide.
- Continuous mining: A concept replacing intermittent rock breakage and material handling with a continuous extraction system. The question asks about the concept and does not mention implementation or specifics.
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Description
Explore various mining methods and their applications in coal extraction and underground mining. This quiz covers topics such as auger mining, drift mining, and the importance of ventilation in mining environments. Test your knowledge on the techniques and safety measures involved in mining.
