HYDROGEOLOGICAL CONDITIONS OF THE BAKCHAR IRON ORE DEPOSIT AND PRELIMINARY ESTIMATION OF WATER INFLOWS

The Bakchar iron ore deposit located in the Tomsk region is a part of the West-Siberian iron ore field, which is considered one of the largest in the world. The length of the ore-bearing strip from the south to the north is about 2,000 km, the strip width is about 150 km. At present, the most detailed research was given to the part of the Bakchar province adjoining Polynyanka village. The explorations were performed as a part of the state geological survey. A relatively deep underlying of ore bodies and a high watering degree of the entire geological section were found out. However, this did not decrease the interest in the development of iron ore since its huge reserves form the powerful resource for the development of the region in the future. Hydrogeological conditions of the deposit in many senses determine the most rational methods of its development and ore mining profitability. The purpose of the article is to estimate the forecasted water inflows and their changes over time under open-cast mining of the iron ore deposit. It is required for the preliminary determination of the scope of works for water lowering and designing of their organization scheme including the selection of drainage water receivers. The paper also analyzes the features of the geological structure down to the depth of ore body bedding. The hydrogeological profile of the section has been schematized for the purpose of predictive analytical hydrodynamic calculation of water inflows. The preliminary estimation of water inflows for the future has been obtained under open-cast mining of the deposit with regard to the change of the groundwater drainage intensity over time. The results of predictive calculations show the significant degree of iron ore deposit watering. The authors emphasize the need for further study of hydrogeological conditions, search and justification of alternative methods of ore field development including hydraulic borehole mining.

Bakchar iron ore deposit, open-cast mining method, groundwater, aquifer, filtration parameters, filtering flow, flow, water inflow, geofiltration calculations

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