Blasting Delay Pattern Development in the Light of Rockburst Prevention – Case Study from Polish Copper MinePiotr Mertuszka, Marcin Szumny, Andrzej Wawryszewicz, Krzysztof Fuławka and David SaiangE3S Web Conf., 105 (2019) 01012DOI: https://doi.org/10.1051/e3sconf/201910501012