In order to develop a method for forecasting the costs generated by rock and gas outbursts for hard coal deposit "Nowa Ruda Pole Piast Wacław-Lech", the analyses presented in this paper focused on key factors influencing the discussed phenomenon. Part of this research consisted in developing a prediction model of the extentof rock and gas outbursts with regard to the most probable mass of rock [Mg] and volume of gas [m3] released in an outburst and to the length of collapsed and/or damaged workings [running meters, rm]. For this purpose, a machine learning method was used, i.e. a "random forests method" with the "XGBoost" machine learning algorithm. After performing the machine learning process with the cross-validation technique, with five iterations, the lowest possible values of the mean-square prediction error "RMSE" were achieved. The obtained model and the program written in the programming language "R" was verified on the basis of the "RMSE" values, prediction matching graphs, out of sample analysis, importance ranking of input parameters and the sensitivity of the model during the forecast for hypothetical conditions.
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