采矿工程师

父亲是一名采矿工程师，在许多不同的国家工作。

mining industry

rotary-drilling machine with coupling (hitch) for mining

mining engineering

massive deposit mining method【矿】

spreader boom (spreader jib) open-pit mining

trucks cutter loaders for mining

block caving coal mining method【矿】

rotary-drilling machine with gearing for mining