цемент бутлуурын машин уул уурхайн төслийн . Service online Shanghai GBM Mining and Construction Machinery Co Ltd is a hi tech engineering group We are specialized in the research development and production of industrial crushing powder grinding mineral processing equipments and other related devices Our products have been sold to 120 countries and …
English for Mining Engineers March 2012. The term drilling is used for smaller diameter holes with a few exceptions such as shaft drilling and raise drilling where larger excavations are created by special machines including cluster drilling The majority of blasthole drilling is performed by two primary methods Percussive drilling and Rotary drilling Өрөмдлөг