The method relates to the field of mineral enrichment. It involves setting a threshold value for the intensity of a luminescence signal after a given time following the end of a pulse of exciting radiation, measuring, in the course of registering the intensity of the luminescence signal of a mineral, the intensity of the luminescence signal after a given time following each pulse of exciting radiation, recording the intensity value obtained for each luminescence signal if the signal registered exceeds the set threshold value, comparing the value measured in the current period with the values obtained in the preceding periods, determining the period in which the intensity value was at its peak, and processing the luminescence signal in which the value of the measured intensity was at its peak in order to determine the separation parameters; a decision to separate the mineral to be enriched is taken in the event that the separation parameters are inside the range of given values.