One of the elements of enhanced safety of mechanically loaded emulsion explosives is the loss of its explosive properties after a certain period of time, without reference to the particular research. The manufacturer described this time for approximately 48hours from the time of its charging to the blasting holes with a gas sensitized product. Under regular conditions of mining works, this time is absolutely sufficient for safe mining operations. In practice, some unforeseeable situations may occur that the charged explosive is not fired within the prescribed period of time. The aim of the study was to verify the knowledge regarding the behavior of mechanically loaded emulsion explosives used in Polish underground copper mines by tracking the changes of detonation velocity over time. The subject of research was Emulinit 8L emulsion explosive manufactured by NITROERG from Bieru, Poland. The measurements were provided using a MicroTrap VOD/Data Recorder, which allows for continuous measurement of the detonation velocity of explosives.