135915 ⎘
Methods of underground or surface mining ; Layouts therefor; Methods of surface mining ; Layouts therefor for brown or hard coal
Underground mining method for unexploited coal in boundary open-pit mine
#2Dendritic reverse underground mining method for thin coal seam at end slope of strip mine
#3Method for radially mining open-pit end slope pressed coal
#4Blasting technique
#5COAL TRACKER
#6Method of moving material
#7Mining method