Day 1 Mining Methods and Ventilation Flashcards
1
Q
Minimum Width w/c eart-moving eqpt can operate
A
Boxcut
2
Q
Wedge of waste on the slope of orebody
A
Wedge
3
Q
Index used in com profitability of different mining operations
A
Stripping Index
Instantaneous SR / Ore grade
4
Q
Desired pH of soil
A
5.5 to 6.5
5
Q
Number of significant figures to w/c measurements have been made
A
Resolution
6
Q
Used to measure displacement thru boreholes
A
Multirod extensometer
7
Q
How many components of stress in a 3D object
A
9
3 for ea axis
8
Q
1 d stress measurement method in borehole
A
Flatjack
Hydraulic fracturing
9
Q
2 D stress measurement in borehole
A
USBM gauge
10
Q
3D stress measurement in borehole
A
CSIRO gauge
11
Q
Stress that breaks majority of rock in blasting
A
Reflected Tensile wave
12
Q
When there is a gap of air bet explosive and rock
A
Decoupled explosive
13
Q
Tool for soft rock used by roadheaders
A
Drag pick
14
Q
Used in TBM to cut harder rocks
A
Disc/Button Cutter
15
Q
Failure due to discontinuities
A
Structural failure
16
Q
What does a wedge in a timberset do
A
For better fit from roof to floor
17
Q
Fxn of header in a timberset
A
So the prop can support a larger area of roof or floor
18
Q
Desc Cable bolt
A
Two bolts connected by wire
Installed separately then wire is tensioned
19
Q
Cause of Type 1 fracture
A
Overall stress dist
20
Q
Cause of type 2 fracture
A
slip on pre-existing discon
21
Q
Type 3 fracture cause
A
Local concentration of stress
22
Q
Intact rock madeup of rock mass and discontinuities
A
Rockmass
23
Q
Macroscopic features of rock such as Arrangement Position Fractures fold Faults
A
Structure
24
Q
Void ratio =
A
Volume of voids/Vol of solid
25
Moisture content =
W-Wsolid / Wsolid
26
Rate w/c temp spreads thru body
Therma Diffusivity
27
Amount of heat transferred thru conduction
Thermal conductivity
28
Use in Tensile Strength test
Brazilian Test
29
Use for Triaxial strength test
Hoek Cell
30
Distance bet discontinuity surfaces
Separation
31
Rock classification
| Predicting the load on steel arch support in tunneling
Terzaghi - Rock Load Classification
32
Relates Stand-up time to unsup span of rock mass
Lauffer Stand-up time Classification
33
Lauffer system became the basis for this
NATM
34
Deere's RQD =
(total length drilled > 10 cm) / length drilled
35
3 parameter in Wickham's Rock Structure Rating
A. Rock structure
B. Discontinuity Pattern
C. Groundwater Inflow
36
Created the RMR System
Bieniawski
37
Slope angle for Sands
37-45 deg
38
Slope angle for Massive rock
70 deg
39
Slope angle of Soills
30 - 40 deg
40
Other name for Toe Buttress
Retaining Walls
41
Found just above bedrock
Regolith
42
Alcohol in Nitric acid solution of metlas is called
Fulmates
43
Black powder coated with glycerin
3300 ft/sec
44
Combination of NG and Guncotton
Blasting Gelatin
45
One of its ingredient is wood pulp
Dynamite
46
Diff of Straight dynamites and Dynamite
Straight dynamite cont Ca/Mg Carbonate
| Creates lots of CO
47
Alcohol subs for NG to make this
Low Freezing Dynamites
48
Dynamite that produces less fumes
Ammonia Dynamites
49
Boreholes filled with water and blasting gelatin abpplication
Geophys exploration
50
Blasting gelatin with AN as chief ingredient
Semi-gelatin
51
Dynamite with AN as chief ingredient
Low Density Dynamite
52
Used in quarrying
Quarry powder
53
Black powder that produces less smoke
Pellet powder
54
Compressed air at 10000psi used in coal mines
Airdox
55
Liquid Carbon Dioxide cjompressed at 2000 psi then detonated
Cardox
56
Just like Cardox but detoinated by Ammonia chloride and sodium nitrate
Hydrox
57
Provides high velocity shock to high explosives to initiate them
Detonators
58
Most common Detonator
Blasting cap
59
Used to initiate grp of explosives simultaneously
Delay detonators
60
Pushes itself into charge after ignitio
Miner's Squib
61
It's shell is ignited by an electric current
Electric Squib
62
Made by spinning yarn, hemp or jutearound a central core of black powder
Safety fuse
63
Detonating fuse that contains PETN as explosive substance
Primacord
64
Holes immediately below the perimeter holes at roof
Shoulder hole
65
Holes adjaccent to permeter holes
Easer
66
- Blastholes ablong bottom of developed round
- Use to create smooth floor
- Contains explosives
Lifter
67
Group of blastholes around one or more uncharged holes
Burn Cut
68
Main explosive in a detonator
Base Charge
69
Equivalent to detonation by detonatino velocity
Brisance
70
Enlargening a hole using small explosive
Springing
Chambering
Bullying
71
Perimeter hole fired after main charge
Cushion Blasting
72
Explosive with large amt of oxidizers dissolved in water droplets surr by an immiscible fuel
Emulsion
73
Cordlike fused with and external flame
| Used to light a series of safety fuses
Ignitacord
74
Used to hold down flying material
Mat
75
Charge that det bef intended
Premature
76
Small porous sphere of AN that can absorb fuel oil
6%
77
Temporary explosive storage at blast size
Powder chest
78
What are Reliever
Same as Easer
79
Prevents accidental det of cap due to stray current
Shunt
80
Hole drilled slightly downward from horizontal into floor
Snake hole
81
Fired during main blasting but at a high delay
Smooth blasting
82
Shokck from first charge detonates the succeeding rounds
Propagation Blasting
83
Diff of Downline and Trunkline
Downline - cord down the hole
| Trunkline - Connects grp of downlines
84
What are Boosters
Known as Primer
| Provide adequiate initiaino of charge
85
Also known as blockholing
Pop blasting
86
Also known as Mudcapping
Blistering/Plastering
87
4 to 6 holes converging to a point
Pyramid cut
88
4 to 6 holes converge an vert line
V cut
| Wedge cut
89
Like V cut but only at one side
Drag cut
90
OSH TLV of CO2
5000 ppm
91
Lower limit of Oxygen
20%
92
TLV of CO
50ppm
93
TLV of NO2
5 ppm
94
TLV of NO
25 ppm
95
TLV of SO2
5 ppm
96
TLV H2S
10 ppm
97
TLV NH3
50 ppm
98
From distillation of coal
| Mostly Methane
Fire Damp
99
Mixture of CO2 and N2
From oxidation of coal
Name given to CO2 also
Black Damp
100
Product of fires and smoke
| CO2 and NH4
Choke damp
101
Mixture of gasses after a fire
After damp
102
Any mixture of CO2 and CH4
| Can be flammable
Illawarra Bottom Gas
103
Lethal conc of CO
White Damp
104
High conc. of H2S
Stinkdamp
105
Indicates spontaneous combustinon
| Odor of Benzene
Fire Stink
106
CO and H
Formed from extinquishing coal fire
Flammable
Water gas
107
Explosive range of CH4
5-15 %
108
Explosive range of CO
12.5-74%
109
Explosive range of H2S
4-44 %
110
Explosive range of H2
4-74 %
111
Used to measure high velocity air
| 5-50 m/s
Pitot-static tube
112
for Measuring low air velocites
| 0.05 m/s isg
Hot Wire Anenometer
113
Shows air flow dist
| for lower velocities
Smoke tube
114
Most useful air vel meas. instrument
Vane Anemometer
115
For very quick spot survey
Velometer
116
Free air axial flow fan is
Not confined
117
Tube axial flow fan is
Impeller is confined
118
Vane Axial flow fan is
Tube axial with guide vanes
119
Max # of blades for part fan
Solidity
120
Higher the solidity, the...
Higher pressure
121
Longer blades means
high airflow
122
What is a volute
Section of fan casing where air flows after leaving impeller
123
Other name for Regulators
System damper
124
Same Q, additive pressure
Series fans
125
Q is additive, pressure is the same
Parallel fans
126
Used to reduce shock loss at fans
Fan Diffuser
127
Best outlet to inlet ratio
4:1
128
AQ Diam
27 mm
129
BQ diam
36.5 mm
130
NQ diam
47.6 mm
131
NQ2 diam
50.5 mm
132
NX diam
54.7 mm
133
HQ diam
63.5 mm
134
PQ diam
85 mm
135
Fleet angle
1 - 1.5 deg
136
Wire rope for 3200 ft and over
locked-out coil
137
Coal mining support
| Rock bolts spaced so their combined capacity is equal to deadweight of strata that may fall
Suspension
138
Coal mining support
| Bolting only planes of weaknesses
Keying effect
139
Coal mining support
Rock bolts reinforce the rock that it becomes part of the support structure
140
UG diam holes
1-4 in
141
Surface Diam holes
6 - 18 in
142
Explosives produce toxic fumes when
fuel shortage
143
Stull stoping dip
45 to 50 deg
144
TLV of H
4 %
145
Grade of backfilled subsidence area for drainage
6%
146
Extremely close spacing of discontinuities
60-200 mm
147
Pit slope for gravel
30 - 37 degv
148
CH4 TLV
1%
