«VIOGEM» Institute, Belgorod, Russia:

Volkov Yu. I., Chief Executive Officer, Candidate of Engineering Sciences, e-mail: viogem@mail.belgorod.ru

Izotov A. A., Chief Engineer, Candidate of Engineering Sciences

Kovdor Ore Dressing and Processing Enterprise, Kovdor, Russia:

Sapozhnikova T. G., Hydrogeologist of the Geological Survey

Prishchenko V. D., Head of the Hydraulic Structure Area of the «Zheleznyy» Mine

“Murmansk Geological Prospecting Expedition” Company, Apatity, Russia:

Melikhova G. S., Chief Hydrogeologist

As a result of the many years researches, «VIOGEM» JSC created the regional hydrodynamic model of Kovdor deposit of baddeleyte-apatite-magnetite ores. On the basis of this model was recommended the complex of the immediate and prospective projects of the protection of near-edge massifs and open pit area from the negative effect of underground and other water discharge outlets during the construction of the ultradeep open pit with the enlarged slopes` angles of benches and edges. According to the hydrodynamic model and actual data, the basic part of water inflow to the open pit is situated on its North-eastern and Eastern edges. Considering this sector, in the content of the preproject designing of the open pit development and in the technical and economic assessment of the standards, there was considered and recommended the following package of measures on the external
hydroprotection of the open pit area: phased reconstruction and broadening of the Eastern line of water drawdown with the construction of new holes, including the replacement of worn and low yield holes; reduction of the filtration volumes in the open pit from core pool of the disposal of open pit and other waters, due to the water extraction for the industrial needs of the enterprise; several variants of the construction of sealing curtains as the radical isolation method of near-edge massif from the growndwater inflows.