Why do some room and pillar retreat panels encounter abnormal conditions? What factors deserve the most consideration during the planning and execution phases o
Blending contributes to create an opportunity to achieve the target feed material and helps optimize the run of mine(ROM)material.In addition,it allows mixing d
In order to access remote reserve areas,some U.S.coal mines have to maintain aged underground entries for a great distance.However,high humidity,warm temperatur
Australian coal mines currently use gas content to assess outburst risk. The gas content threshold values for each mine are indirectly determined from measureme
Quartz,the second most abundant mineral in the earth’s crust,is a gangue mineral in practically every flotation process.Coarse quartz flotation has been a long
The adjustment of the gas drainage rate has an immediate impact on air leakage in gob,thus resulting in the change of self-heating of coal.While regulating the
Moisture in coal seams changes gas adsorption capacity, induces coal deformation, and affects coal porosity. However, fewer studies have investigated the dynami