Experience of destressing slotting to prevent gas-dynamic events in mechanized carnallite mining

Resumo

The author analyzes the method to prevent gas-dynamic events during mechanized mining of carnallite at Upper Kama potassium–magnesium salt deposit. The method ensures efficient gas drainage and relaxation of outburst-hazardous rocks due to a horizontal drainage borehole slotter in the sidewall of a face entry. The data of the mine experimental studies are presented. The time behavior of residual gas content and air sorption indexes of carnallite in the influence zone of the degassing slot is determined. It has been found expedient to use destressing slotting to prevent gas-dynamic events during mechanized mining of carnallite.