Miner's Challenge Crossword

Passage through which air is carried
Instrument for measuring air velocity
Rotary drill that penetrates with a screw device
Mine waste or rock used to support the roof after coal removal
Vein containing no coal or a coal seam too thin to work
Bar used to support the roof between two walls
Stratum of coal or other sedimentary deposit
Mountain staircase created by the cutting of coal on the surface
Pile or mound of material capable of restraining a vehicle
End of the drill rod used for the breakage of rock
Middle rank coal referred to as "soft coal"
Term applied for a carbon dioxide and nitrogen mixture (2 words)
Low place in a mine roof giving insufficient headroom
Meas. of energy needed to raise the temperature of one pound of water by one degree Fahrenheit.
Protective covering of a cab on a mining machine
Miner's safety helmet
Railway wagon
Solid, brittle, somewhat distinctly stratified combustible carbonaceous rock
Particles of coal that can pass a No. 20 sieve
Area where coal is removed or processed from it natural deposits
Measured tonnages of coal remaining in a coal seal
Process of separating coal from undesirable material using differences in densities
When doing #up/down, pyritic sulfur (sulfur + iron), does this in water
When doing #up/down, coal does this in water
Coal heated in a vacuum
British name for a coal mine
Machine that constantly extracts coal while it loads (2 words)
Apparatus for continuously moving material
Overburden of any deposit
Device with a small charge for setting off explosives
To unload a load of coal
Exposed area of a coal bed where coal is being extracted
Exposed area of a coal bed where coal is being extracted
Mass of roof rock that has dropped
Machine that feeds coal onto a belt evenly
Extensive crack or fracture in the rocks
Coal, crude oil and natural gas are _________ fuels
Cord used to ignite a cap
Area with waste where coal was removed
Horizontal transport of coal and ore
Vertical transport of coal and ore
Unexcavated face in a surface mine
In the direction of the working face
Passage which fresh air is drawn in
Smooth, rounded piece of rock in the roof of a mine (2 words)
put explosives in a drilled hole or load material into a haulage device
Voltage by federal standards which is 660 volts or less
Carrier of mine personnel to and from the work area (2 words)
Potentially explosive gas formed naturally from the decay of vegetative matter
One who extracts coal, ore, etc. from the Earth
Failure of a blasting charge to explode
Federal agency which regulates mine health and safety
Opposite of #up/down
Coal that appears at or near the surface
Layers of soil and rock covering a coal seam
Document issued to give approval for mining to take place
Area of coal left to support the roof
Roof bolting
Plant where coal is cleaned
Dust particles 5 microns or less in size
Air coming back out of the mine
The side of a pillar or the wall of an entry.
Coal extraction machine that works by tearing the coal from the face.
Overhead surface of a coal working place
Cutting a representative part of an ore or coal deposit
Stratum or bed of coal
Portion of the working area of a mine
Number of hours or the part of any day worked
Car being hoisted from a slope or shaft
Waste product of the process of smelting
Flat spike hammered into a wooden plug anchored in a hole drilled into the mine ceiling from which is threaded a plumbline
Coal of a rank intermediate between lignite and bituminous
Section of the conveyor at the extreme opposite end from the delivery point (2 words)
2000 pounds
Mine roof