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zCorrelation > Mining Methods and Mine Ventilation > Flashcards

Mining Methods and Mine Ventilation Flashcards

1
Q
  1. It is a method of mining for surface highwall or outcrop recovery of coal by boring or excavation openings
    a. Drift mining
    b. Auger mining
    c. Strip mining
    d. Single bench mining
A

B

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2
Q
  1. The amount of oxygen in underground mines required under the “Revised Mines Safety Rules and Regulations” is
    a. 18% by volume
    b. 19% by volume
    c. 20% by volume
    d. 20% by volume
A

C

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2
Q
  1. In planning and development, what is the main factor for determining the bench height in an open pit?
    a. Blast pattern design
    b. Equipment specification
    c. Subrill
    d. Groundwater conditions
    e. Volume of material to be blasted
A

B

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3
Q
  1. Occurs when an obstruction to the flow in encountered and the velocity of the medium is great enough
    a. Coagulation
    b. Impingement
    c. Brownian motion
    d. Laminar flow
    e. Turbulent flow
A

B

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4
Q
  1. What is the importance of defining the pit limit?
    a. To determine the amount of mineable ore
    b. To determine the number of equipment to use in the extraction of ore
    c. To determine the cut-off grade of minerals of value
    d. To determine the life of mine
    e. All of the above
A

A

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5
Q
  1. It is the underground mine gas otherwise called as “white damp”
    a. Nitrogen dioxide
    b. Hydrogen sulfide
    c. Methane
    d. Carbon monoxide
A

D

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6
Q
  1. Refers to the timbering or concrete around the mouth or top of a shaft
    a. Support
    b. Collar
    c. Rockbolt
    d. Square set
A

B

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7
Q
  1. Cut and fill stoping, shrinkage stoping, VCR stoping and longwall mining are methods that are:
    a. Naturally supported
    b. Unsupported
    c. Artificially supported
    d. None of the above
A

C

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8
Q
  1. How many drivers are required for a mining company that operates 10 dump trucks, running 24 hours a day in a 2-shift schedule, considering 85% mechanical availability and 10% manpower availability?
    a. 15
    b. 8
    c. 10
    d. 20
    e. 19
A

E

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9
Q
  1. The condition of the surrounding rock in in-situ mining
    a. Consolidated
    b. Unconsolidated
    c. Permeable
    d. Impermeable
    e. Porous
A

D

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10
Q
  1. 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. Caving
    b. Supported
    c. In-situ leaching
    d. Unsupported
A

D

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11
Q
  1. A type of anemometer suitable for measuring very high velocities than special anemometers
    a. Vane anemometer
    b. Velometer
    c. Pilot tube apparatus
    d. Indicating anemometer
A

C

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12
Q
  1. All unit operations involved in excavating or moving bulk materials during mining
    a. Materials handling
    b. Loading
    c. Hauling
    d. Hoisting
A

A

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13
Q
  1. Mine gas produced as a result of poor blasting
    a. Methan
    b. Nitrous oxide
    c. Carbon dioxide
    d. Hydrogen
    e. None of these
A

B

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14
Q
  1. An overhand method in which the ore is mined in horizontal slices and remains in the slope as a temporary support for the walls and to provide a working platform
    a. Overhand cut-and-fill stoping
    b. Sublevel caving
    c. Top slicing
    d. Shrinkage stoping
    e. Stull stoping
A

D

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15
Q
  1. The underwater excavation of a placer deposit, usually carried out from a floating vessel which may incorporate processing and waste disposal facilities
    a. Leaching
    b. Hydraulicking
    c. Dredge
    d. Quarrying
    e. None of these
A

E

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15
Q
  1. The concept of replacing the intermittent operations of rock breakage and material handling in mining with a system of continuous extraction
    a. Automation
    b. Rapid excavation
    c. Novel method
    d. Robotics
A

B

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16
Q
  1. Open pit excavation from which ore is removed by gravity through a raise or raises connecting to underground haulageways
    a. Placer mining
    b. Strip mining
    c. Glory hole
    d. Sluicing
A

C

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17
Q
  1. The mixture of gases which remains in a mine after a mine fire or an explosion of fire damp or coal dust
    a. Fire damp
    b. Stink damp
    c. Black damp
    d. After damp
A

D

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18
Q
  1. During the first shift of a 24-hour operation with a 2-shifting schedule, a drill machine was in operation for 10.5 hours and underwent repairs for 0.5 hours, within this time frame, the drill machine achieved a production of 251 meters. Calculate the percentage utilization of the drill machine during the first shift
    a. 86%
    b. 87%
    c. 88%
    d. 89%
    e. None of these
A

C

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19
Q
  1. The practice of removing the gas contained in a coal seam and adjoining strata through wellbores, drillholes, and pipelines
    a. Methane drainage
    b. Well production
    c. Acid mine drainage
    d. Borehole extraction
A

A

20
Q
  1. It is the process wherein large quantities of hot water are introduced through wells drilled into buried deposit of native sulfur
    a. Frasch process
    b. In-situ leaching
    c. Acid-leaching
    d. Cyanidation
A

A

21
Q
  1. A method of caving that utilizes the weight of an ore column that us being caved to crush itself into sizes small enough to pass through draw points that have been prepared beforehand
    a. Sublevel caving
    b. Top slicing
    c. Longwall mining
    d. Block caving
A

D

22
Q
  1. It is a vertical or horizontal opening to the surface where air enters and circulate inside the mine with the aid of different fans
    a. Downcast
    b. Exhaust
    c. Inlet
    d. Intake
A

D

23
Q
  1. In borehole extraction (aqueous extraction), the rock should be:
    a. Permeable and competent
    b. Competent and impermeable
    c. Consolidated
    d. Unconsolidated
    e. Any type
A

B

24
Q

Produces pressure by imparting a tangential acceleration to air as it proceeds through the fan impeller
a. Centrifugal fan
b. Axial flow fan
c. Auxiliary fan
d. Exhaust fan

A

B

25
Q
  1. A surface mining method where the overburden is stripped first and dumped at the same time. Then the orebody is mined, horizontally in a single bench
    a. Multiple bench
    b. Strip mining
    c. Dredging
    d. Glory hole
A

B

26
Q
  1. It is timbered stope but classified as a self-supporting opening because the timbers are not used as support but to provide working platforms for miners. The method is applicable to very narrow veins so that the timbers to be used are normally 5-6 ft.
    a. Longwall mining
    b. Square set
    c. Stull stope
    d. Top slicing
A

C

27
Q
  1. It is also called back ‘pressure results’ from the inside of the vent tube or drift not being perfectly smooth, the air cannot move along the tube or drift as fast as the fan would like to blow more air into the airway thus producing friction
    a. Velocity head
    b. Static head
    c. Load of a fan
    d. Fixed pitch
A

B

28
Q
  1. It is a type of ventilation which is efficient and generally dependable
    a. Natural ventilation
    b. Lime dusting
    c. Natural draft
    d. Mechanical ventilation
A

D

29
Q
  1. The most expensive among the placer mining methods
    a. Dredging
    b. Hydraulicking
    c. Sluices
    d. Rocker
A

A

30
Q
  1. A term applied to carbon monoxide, or atmosphere containing lethal quantities of carbon monoxide
    a. Stink damp
    b. Fire damp
    c. White damp
    d. After damp
A

C

31
Q
  1. The threshold limit value of hydrogen sulfide as per “Revised Mines Safety Rules and Regulations”
    a. 0.01% by volume
    b. 0.20% by volume
    c. 0.10% by volume
    d. 0.30% by volume
A

C

32
Q
  1. An effective way to operate a mine with conventional haulage methods in an inclined seam or bed is to drive all openings cross pitch, that is:
    a. At an angle to the dip of the deposit
    b. At an angle half the dip of the deposit
    c. At an angle to the strike of the deposit
    d. At an angle 45 deg. to the dip of the deposit
A

C

33
Q
  1. It is the underground mine gas otherwise called as “marsh gas”
    a. Nitrogen dioxide
    b. Hydrogen sulfide
    c. Methane
    d. Carbon monoxide
A

C

34
Q
  1. A surface or near-surface deposit, usually tabular and may be of considerate areal extent, containing mineral particles in detritus
    a. Detrital deposit
    b. Lenticular deposit
    c. Tabular deposit
    d. Massive
A

A

35
Q
  1. It is the underground mine gas otherwise called as “choke or black damp”
    a. Carbon dioxide
    b. Hydrogen sulfide
    c. Methane
    d. Carbon monoxide
A

A

36
Q
  1. The total area around an airway is called
    a. Regulator
    b. Surface area
    c. Rubbing surface
    d. Resistance surface
A

C

37
Q
  1. Underground mining method used by small-scale miners
    a. Compressor mining
    b. Gophering
    c. Square-set stoping
    d. Room-and-pillar
    e. All of these
A

B

38
Q
  1. The unexcavated face of exposed overburden and coal or an ore in an opencast mine or the face or bank on the uphill side of a contour strip mine excavation
    a. Bench face
    b. Outcrop
    c. Highwall
    d. Ledge
    e. Bench height
A

C

39
Q
  1. According to the fan laws, twice the volume develops how many times the pressure?
    a. 7x the pressure
    b. 6 x the pressure
    c. 5 times the pressure
    d. 4 times the pressure
A

D

40
Q
  1. Methane is explosive with this range of concentration
    a. 1%-10% by volume
    b. 15%-25% by volume
    c. 10%20% by volume
    d. 5%-15% by volume
A

D

41
Q
  1. It is the oldest method of mining both coal and most metallic ores
    a. Longwall mining
    b. Room-and-pillar
    c. Sublevel caving
    d. Block caving
A

B

42
Q
  1. Basically a continuous large-volume digging machine attached to a gravity concentrating facility (jigs, etc.) with waste removal systems, contained on a floating platform
    a. Bucket-wheel excavator
    b. Scraper
    c. Dragline
    d. Dredge
A

D

43
Q
  1. Prolonged exposure of miners to coal dust causes:
    a. Anthracosis
    b. Pneumoconiosis
    c. Silicosis
    d. Asbestosis
    e. Scoliosis
A

A

44
Q
  1. During the first shift of a 24-hour operation with a 2-shifting schedule, a drill machine was in operation for 10.5 hours and underwent repairs for 0.5 hours, within this time frame, the drill machine achieved a production of 251 meters. Calculate the percentage utilization of the drill machine during the first shift
    a. 86%
    b. 87%
    c. 88%
    d. 89%
    e. None of these
A

C

45
Q
  1. It is the underground mine gas otherwise called as “laughing gas”
    a. Nitrogen dioxide
    b. Hydrogen sulfide
    c. Methane
    d. Carbon monoxide
A

A

45
Q
  1. In the layering of gases after an underground explosion, which of these gases lies on top?
    a. Carbon monoxide
    b. Carbon dioxide
    c. Methane
    d. Hydrogen sulfide
    e. Nitrogen oxide
A

C

46
Q
  1. Hydrogen gas is explosive with this range of concentration
    a. 1%-71% by volume
    b. 7%-77% by volume
    c. 10%-80% by volume
    d. 4%-74% by volume
A

D

47
Q
  1. The most predominant method of mining worldwide
    a. Placer mining
    b. Open pit mining
    c. Underground mining
    d. Hydraulicking
A

B

zCorrelation (7 decks)

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