Tselyk
A block - a section of hazardous, threatened or non-hazardous coal seam bounded by separate workings, mined space or geological disturbance from at least two opposite sides, and its smallest size in the plane of stratification does not exceed the size of the abutment pressure zone
Source: "INSTRUCTION ON SAFE MINING OPERATIONS AT COAL MINE SHAFTS PRONE TO ROCKBURSTS. RD 05-328-99"
(approved by the Order of the State Coal Safety Inspectorate of Russia dated 29.11.1999 No. 87)
(together with "METHOD OF FORECASTING ROCKBURST HAZARD IN COAL SEAMS AND ROCKS", "REGULATIONS ON THE COMMISSION FOR ROCKBURSTS", "MODEL REGULATIONS ON THE SERVICE FOR FORECASTING AND COMBATING ROCKBURSTS AT MINES", "METHOD OF FORECASTING ROCKBURST HAZARD IN COAL SEAM AREAS AND CONTROLLING THE EFFECTIVENESS OF PREVENTIVE MEASURES")