loader for underground mining, like gold, copper, zinc ore etc. MLR-120 railed Mucking Loader is designed for rock mucking in tunnel size of 2.8 x 2.8m 3.2 x 3.2m, with rated max. loading capacity of 120m3/hour.It is suitable for mucking rock of average 500 x 500mm in size, Protodrakonov scale of rock hardness 12º max. The max. rock through-size is 800 x 800mm. The max. digging depth is 450mm, ...