Rockburst prevention methods used in 2005–2006 in two mining panels A/G-23 and D/G-54 of Polkowice–Sieroszowice copper ore mine were presented in the paper. Mining-and-geological conditions as well as seismic activity were depicted. The effectiveness of active, technological and organizationaltechnical methods for rockburst hazard reduction was evaluated using seismological data. The location of tremors’ epicentres within the mining panels, the number and energy of tremors provoked with blasting and 24-hour-distribution of seismic activity were analysed in relation to mining-and-geological conditions to determine how effective rockburst prevention methods were.