The distance between the rape is accepted from 20 to 40 m.

When part -work, the city conducts systematic instrumental observations using industrial equipment by 3,500 rappers. The distance between the rape is accepted from 20 to 40 m. Leveling and measurements of horizontal distances between the rape. The length of the lines along which horizontal measurements are carried out is 25 km. Coordinated between mines is the development of the number. For two mines - Shomberki and Dimitrov, a unified mining front is organized so that the structures are located on the area of the flat bottom of the martial in the full -time zone. Mining work is simultaneously carried out on only two layers, and it is planned in such a way that horizontal deformations on the earth's surface are compensated for when summing. The laying of the developed space is carried out very carefully, the settlement coefficient A = 0.1 is practically reached, although in calculations with the margin a = 0.15. Mining is planned so that horizontal deformations on the earth's surface do not exceed 3 mm. Moreover, to protect buildings and structures, if necessary, constructive measures are used, if necessary.