Extendable/erectable arm assembly and method of borehole mining
Fluid jet method and device for breaking hard material
Formation of load-bearing foundations by laser-beam irradiation
Fragmentation of an underground ore body
Freely rotatable pick bit holder on rotary driven member and met
Gaining access to very deep coal seams by carrying explosive in
Gob methane drainage system
Grid of synthetic material
Heat added to underground cemented fill to obtain both early...
High pressure water jet channeling horizontally into a solid mou
High wall mining conveying method
Highly reliable method of rapidly generating pressure pulses for
Highwall mining system
Horizontal free face blasting for minimizing channeling and moun
Horizontal mining machine and method of slot mining
Horizontal remote mining system, and method
Hydraulic borehole mining system and method
Hydraulic couple rotational force hydraulic mining tool apparatu
Hydraulic fracturing of ore bodies
Hydraulic jet cutting tool and method