Technology and equipment for boosting coal extraction by room-and-pillar mining

V. V. Sementsov, V. S. Ludzish, S. A. Prokopenko

Research output: Contribution to journalArticlepeer-review


In terms of a coal mine of Mezhegei Coal Company in the Republic of Tyva, Russia, the technology of room-and-pillar mining with coal extracton from rooms and then from pillars is described. It is shown that this mining system involves high mineral loss (up to 30-40%). The potental of improving efficiency of coal extracton from pillars using import equipment-mobile roof support-is revealed. The structure and operaton of MRS in foreign mines is described. This technology allows extractng coal from pillars with people and equipment positoned in a safe zone, with controllable roof caving, which prevents large-scale deformaton of ground surface. The internatonal practce proves extractability of up to 85-90% of coal from rib pillars under protecton of this support type. The purchase of import equipment by Russian mines involves high expenses connected with shipment and customs dues. This artcle proposes a simpler, safer and chipper MRS structure. In the new design, the system of hydraulic hoist of the roof canopy is replaced by the pneumatc hoist. The basic parameters of MRS are presented. The use of the pneumocylinder in the capacity of the expansion element simplifies the whole structure, reduces injury risk and saves purchase cost of MRS. The put forward engineering soluton enables mines using room-and-pillar to extract coal at high efficiency and comparatvely low operatng cost.

Original languageEnglish
Pages (from-to)65-78
Number of pages14
JournalMining Informational and Analytical Bulletin
Issue number10
Publication statusPublished - 2019


  • Coal loss
  • Extracton
  • Mine
  • Pillar
  • Pneumocylinder
  • Roof canopy
  • Room-and-pillar mining
  • Seam
  • Structure

ASJC Scopus subject areas

  • Ecology
  • Geotechnical Engineering and Engineering Geology
  • Geology
  • Geochemistry and Petrology
  • Industrial and Manufacturing Engineering

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