top 7 biggest mining excavators in the world31 jul 2017 . the world's biggest hydraulic excavator is currently owned by , but was originally launched by , in germany, in 1997. 2. hitachi.
mining geology sampling methods: channel, chips, core17 mar 2017 . a comprehensive drilling program was needed to determine the average . the cost of this work using two rotary bucket drills was 98.6 cents per foot of . a 6-inch truck or crawler-mounted rig and the hillman airplane drill,.