pdf алх тээрэм оновчлолын самак уул уурхайн
English for Mining Engineers. Jul 01, 2012· Surface mining operation units: Drilling and Blasting / Ил уурхайн процессууд: Өрөмдлөг, тэсэлгээ Drilling 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.
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