Stationary drill string rotary hydraulic mining tool and method
Stress control mining method and apparatus
Strip-auger method of mining thin seams of hydrocarbonaceous dep
Subsidence control
Subterranean drilling and slurry mining
Subterranean drilling and slurry mining method
Subterranean hydraulic mining method
Subterranean mining
Surface working accessory
Surface working accessory and method
System for and method of demolition