Mining Methods and Ventilation

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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?

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:

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?

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?

Turbulent flow (C) Signup and view all the answers

What is the importance of defining the pit limit?

All of the above (E) Signup and view all the answers

What is the underground mine gas otherwise called as 'white damp'?

Methane (B) Signup and view all the answers

Refers to the timbering or concrete around the mouth or top of a shaft?

Collar (D) Signup and view all the answers

Cut and fill stoping, shrinkage stoping, VCR stoping, and long-wall mining are methods that are:

Artificially supported (C) Signup and view all the answers

How many drivers are required for a mining company that operates 10 dump trucks, running 24 hours a day in a 2-shift schedule?

19 (B) Signup and view all the answers

What is the condition of the surrounding rock in in-situ mining?

Consolidated (B) Signup and view all the answers

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?

Caving (A) Signup and view all the answers

A type of anemometer suitable for measuring very high velocities than special anemometers?

Pitot tube apparatus (A) Signup and view all the answers

All unit operations involved in excavating or moving bulk minerals during mining are?

Loading (D) Signup and view all the answers

Mine gas produced as a result of poor blasting is?

Carbon Monoxide (E) Signup and view all the answers

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?

Overhand Cut-and-Fill Stoping (B) Signup and view all the answers

The concept of replacing the intermittent operations of rock breakage and material handling in mining with a system of continuous extraction is?

Automation (C) Signup and view all the answers

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.