bucket wheel excavator on a walking-rail track

back belt big briquette briquetted briquetting bucket cabin circle concentration conveyor dig dump equipment excavator factory ferriferous ferrous ferruginous haze heap high highly hot industrial industry iron ironbearing large load machine manufacture material metal metallurgical metallurgy mining ore outdoors overburden piece pile plant processing production rail railway rotor semifinished stack steel storage technology transport transporter vehicle view walking wheel