"VOSTSIBUGOL" (RU: "Востсибуголь") is the productive consortium of the Ministry of the Coal Industry of the USSR for the extraction of the coal, within the Irkutsk and Chita provinces of the Russian Federation, and within the Buryat ASSR. The major industrial centres are the Irkutsk city (the administrative centre of the "VostSibUgol" consortium), and the Cheremhovo city. The consortium has been established during the 1945. The consortium includes 8 open-pit mines, 3 underground mines, beneficiation plants, and so on. The extraction works are conducted at the two mineral coal deposits, and at the five brown coal deposits. The shared participation within the total quantity of the extraction is 1.1% for the mineral coals of the G mark, 35.7% for the mineral coals of the D mark, and 63.2% for the brown coals of the B mark.
The major method of the extraction within the "VostSibUgol" consortium is the opencast method (96.6%). At the same time, more than 80% of the total quantity of the coal is extracted using the "Azeysky named after the 50th anniversary of the USSR", "Kharanorsky", "Safronovsky", and "Cheremhovsky" open-pit mines. There are being developed the layers with the thickness of 1.3-40 metres, and with the angle of the dip of up to 25 degrees. The depth of the development is up to 90 metres. The average overburden stripping ratio is 2.65 cubic metres per tonne. Approximately 73% of the overburden stripping works are performed using the system of the development without the transportation of the waste rock. The major excavation and transportation equipment is: the single-bucket excavators with the voluminous capacity of the bucket of more than 10 cubic metres, the bucket wheel excavators, the drilling installations for the roller-cone and rotary drilling, the automotive dump trucks and automotive trains (coal-carriers) with the load carrying capacity of 27-40 tonnes and 65 tonnes respectively. There is planned to transition completely to the opencast method for the extraction of the coal.
At the underground mines (at the depth of 50-450 metres), there are being developed the layers with the thickness of 1-15 metres, with the angles of the dip of 3-25 degrees. All the underground mines are dangerous because of the explosion of the coal dust. At the clearing works, there are used the KM-81E mechanized complexes, of the OKP and MKM types, while at the penetration works, there are used the 4PU combined cutting-loading machines, and the loading machines of the PNB and PPM types. The level of the comprehensive mechanization is 98.5% at the clearing works, and is 89% at the preparatory works. The coals, which are being extracted, are used mostly within the eastern Siberia by the enterprises of the energetic (80%) and chemical (8%) branches of the industry.
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