Tóm tắt:

Determination of coordinate and bearing transferring into undergrounds is an important task of mine surveying. The orientation through two depth shaíts is one of ỉhe best methods. It's requìring the application of new technology, has high accuracy and increase labour productiviỉy. The paper deals with the necessity of using gyroscopic theodolite GTA1800R in the orientation for directions of tunnel driving through two depth shaft in Hà Lầm coal mine.