Methodology of designing blasting works in open pit mining in terms of their impact on construction objects

The firing of explosive charges with (millisecond) time delay gives a wide range of possibilities in designing multi-row blasting patterns and, at the same time, contributes positively to the minimization of the impact of blasting works on building infrastructure in the vicinity of mines. Selection of the appropriate millisecond delay should be based primarily on seismograms of vibrations induced during the firing of single explosive charges and analysis of the frequency structure of these vibrations. Using this type of data, the article presents a procedure for optimizing millisecond delays with the use of a computer programme dedicated to modern, electronic initiating systems that are currently applied towards obtaining a favourable vibration structure in terms of the assessment of the impact on buildings in accordance with the standard regulations applicable in Poland.