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Coal mines and mining
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Effects of treatment of goaf (strip packing or caving) on rock in immediate vicinity
Giant bucket wheel crawler excavator with carriage for 90-m height of cut
Dropbottom cars from autos serve Kanawha mines
Strip mine converts to automotive haulage
Tonnage raised by adoption of shuttle-car gathering
Automatic track-brake system for man-haulage
Underground photography as aid to accident prevention
Track brakes for man-riding vehicles
Track brakes for man-riding vehicles
New "Torkret" auto-pneumatic stower
Prevention of accidents in collieries
Effect on railways of ground movements
Car transfer speeds rock gangway development
Evolution of truck haulage at Enos
Shuttle car haulage in difficult conditions
Shuttle cars in room-and-pillar block retreat panel system
Shuttle cars handle output of Illinois mine
Transportation service for Mobile loaders
Bituminous strippers install shovels and draglines and adopt larger automotive haulage units
Twenty-seventh annual review and progress number
Twenty-seventh annual review and progress number
Explosion at Blaenhirwaun colliery
Driving of tunnels at high speed
Armadillo heavy duty face conveyor
New on-track shuttle car boosts loading time at face
Mainline grading work coordinated with entry development
Economical entry driving with duckbills
Three-axle trucks transport overburden and coal
Shuttle cars latest step in Oliver modernization
Extraction of stoops by shuttle cars and loaders
Betriebskosten und Selbstkosten der Zechenbahnen