2017-5-31 · Mining is a branch of industry involving a lot of risk, which is connected with the presence of numerous natural threats. As the depth of mining increases, so does the probability of the occurrence of hazards (Hargraves 1983; Díaz Aguado and González Nicieza 2007; Szlązak 2013).Some of the most serious problems in mining are gas hazards, which are directly connected with the following ...