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Proper condition of the mine shaft equipment is of vital importance both in view of production and safety. In some cases, this state can be adversely affected by the changing geological conditions in the shaft surroundings so that special precautions are nessesary for reliable operation ofthe shaft. ln the paper, an intrinsically-safe measuring system, approved for gassy mine use, based on the laser vibration sensor has been presented including its construction and operational characteristics.Examples of application have also been given related to measurements oflow-frequency (<10 Hz) vibration events and of displacements both in the surface and underground parts of the shafts.

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