Underground mining methods via boreholes and multilateral blast-holes

Isolated overburden grouting filling method for coal gangue underground emission reduction

Plug for a Void, System and Method

Process for controlled in-situ coal gasification and a filling device to operate the same

Multi-energy complementary system for co-associated abandoned mine and use method

Plug for a void, system and method

Plug for a void, system and method

Filling mining method for fully-mechanized top coal caving working face

Systems and methods for detection of underground voids

Methods and systems for foam mine fill

Plug for a void, system and method

Roadway forming method by expanding excavating and filling gangue paste in thick coal seam

Plug for a void, system and method

METHOD FOR DYNAMIC WATER FEEDING AND HOLE SEALING USING HIGH WATER-ABSORBENT RESIN

System and method for forming a cavity in a backfilled stope

Method for removing hydraulic support for solid filling coal mining

METHODS AND SYSTEMS FOR FOAM MINE FILL

System and method for treating an excavation activity

PRODUCING HYDROCARBON MATERIAL FROM A LAYER OF OIL SAND

PRODUCING HYDROCARBON MATERIAL FROM A LAYER OF OIL SAND

Shaft plugging system

Methods for grout injection repair and water retention in goaf

Hazardous waste disposal using directional angled drilling