For example, at the Szomberki mine there is a department coordinating the part-time work of Bytom at the Somberki, Dimitrov and Rozbark mines. Similar departments exist in the cities of Katowice, Soskovets and others. The task of these departments is to draw up and coordinate long-term plans for mining operations under settlements and industrial structures, coordinate mining operations carried out by several mines, calculate deformations of the earth’s surface under undermined structures, issue initial data to design organizations for developing protection measures for operated and newly designed buildings, control over the implementation of protective measures and the necessary instrumental observations.
As shown above, in the Upper Silesian Basin, a number of metallurgical plants have been worked on. Metallurgical plants, as a rule, are partially mined. Under one of the metallurgical plants, a seam with a thickness of 10 m was worked up in three layers at a depth of 300-540 m. In the area of coke oven batteries, subsidence reached 200-300 mm; for 1956-1966 horizontal deformations of the earth’s surface have reached 1 mm; at the site of the plant, subsidence was 200-300 mm, horizontal deformations were 1.5-2 mm7m. There were no difficulties in the work of the plant.
Roughly similar conditions for part-time work and other metallurgical plants. For example, during the side-work of the Pokuy plant, two seams are mined: seam 507 (thickness 4.5 m, depth 300 m) and seam 510 (thickness 10 m, depth 350 m). The coal is also removed in strips, leaving 50% of the coal. The maximum subsidence reaches 50 cm.
The experience of working in towns and villages, for example, the city of Bytom, is of great interest. In the safety pillar near Bytom, with a population of 200 thousand people, there is 170 million tons of coal. The development of the pillar began in 1949. To date, three mines — Shomberki, Dimitrov, Rozbark have already worked out 22 million tons. Six seams are being developed with hydraulic filling of the worked-out space with a total thickness of 20 to 24 m at a depth of 120-860 m, the dip angle is 1 -40 °. The thickness of the seams is 1.5-8 m. Additional mining is complicated by the fact that there are two zinc-lead mines operating in the city area, operating with a hardening backfill.
