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The efficiency of drilling and blasting works can be assessed in many ways, depending on the desired effect. The evaluation can be performed on the basis of the quality of the explosives used for rock extraction. On the other hand, the correct assessment should include the results of drilling and blasting works. One of the parameters that are commonly used in the quality evaluation of explosives is the in situ velocity of detonation measurement, which is a direct indicator of the efficiency of the utilised explosi...