Abstract In recent decades, many open pit (OP) mines have either already made the decision or are at planning stage to change their mining activity from OP underground (UG) remain competitive. Technically, before ends its operation, both and UG will be operated simultaneously for a certain period of time. It is well known that operation causes subsidence, discontinuous deformations, changes in ...

Effective gas management in coal mines, as well as proper ventilation design, is very important for maintaining the safety of underground coal miners. Advances in numerical modeling techniques have enabled evaluations of the coal mining environment using advanced grid designs and computed gas distributions through detailed mathematical models. These models help engineers to “see” the “unseen” a...

Longwall shearers’ haulage system of the Eicotrack type, used most often nowadays, is presented in this article. Its disadvantages, causing problems with a correct operation mechanized longwall shearer systems, are discussed. The concept innovative Flextrack, which should reduce occurrence disadvantages mentioned above, described. A course and research results, connected rig tests Flextrack fun...

The paper presents results of application of a machine learning method, namely the induction of classification and regression rules, for seismic hazard prediction in coal mines. The main aim of this research was to verify if machine learning methods would be able to predict seismic hazard more accurately than methods routinely used in Polish coal mines on the basis of data gathered by monitorin...

Water quality along the Waratah Rivulet in the Woronora Lake Catchment, New South Wales (NSW), Australia, has been monitored during the last three years by the Sydney Catchment Authority. Water quality data shows changes in chemical composition due to cracking of streambeds and rockbars, and diversion of surface water into subsurface routes in the Hawkesbury Sandstone aquifer. Water quality ups...

The effective discrimination of aquiclude mining stability is one the important indexes for feasibility judgement water-conserved mining. Based on mining-induced deformation characteristics weakly cemented and water level change aquifer in northwest China, a mechanical model established, instability criterion its influencing factors are analyzed. results show that has strong plastic ability mai...