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The paper presents the results of studies of the coal microstructure. The presence of cleavage and the normal or strike nature of the stress state of the coal seam leads to the e longitudinal fracturing (along the borehole) orthogonally to the coal bedding. With the reverse nature of the stress state, the orientation of the fracture depends on the direction of drilling the well. In this case, the crack can be formed both along and orthogonally to the bedding. The results were used to analyze the effect of hydrauli...

The paper gives comparative analysis of the method of vacuum extraction of Chaga carried out by the authors. The process supposed that the ground Chaga was pre-vacuumed for 10 minutes in order to release the holes from air and moisture vapor and conduce efficient time pregnation of the extractant; further, the author saddled still dewatering the ratio 1:10 and kept at the temperature of 70В°C.In the process of extraction, the pressure was hourly lowered to 0.3 atm, which promoted the boiling of the extractant in a...