LLC “UMMC-Holding”, Verkhnyaya Pyshma, Russia:

A. N. Prodanov, Chief Specialist of Mining, e-mail: a.prodanov@ugmk.com
A. P. Tyulkin, Chief Specialist of Mining

Institute of Mining of Ural Department of Russian Academy of Sciences, Ekaterinburg, Russia:
O. V. Zoteev, Leading Researcher of Laboratory of Geodynamics and Rock Pressure

This article considers the possibility of reclamation of waste borrow excavations, connected by water tunnels with functioning underground mines and rock refuse. There was made a conclusion that application of ordinary pulp with low weight persentage of solid component is irrational for this purpose, because it leads to the sharp increasing (by far and away) of water inflows into the underground mine. Application of dehydrated concentration tails is the most optimal, which makes possible the sharp decrease of costs for reused water swap and load reduction for underground mine dewatering. Waste dehydration by various design filters to the cake state is possible only with low amount of products or appreciated value ores. It is more reasonable to use paste thickening technologies with high volumes of low and average value ore processing (more than 1 mln t of ore pre year). Using such technologies allows not only optimize the costs for return of reused water with absence of working-capable slip road to open-pit, but, in some cases, to dispose free water losses from reclamayed excavations. At the same time, risks of volley pulp break and flood of underground excavations with pulp are excluded because of high viscosity of paste thickening products. Using paste thickening products for reclamation of open pits, connected with underground mines by large channels, requires the construction of solid straight arch system, intended for high pressure, for the protection of functioning underground excavations. There is also required the organization of removement of free water, sent into the open pit bowl due to atmospheric precipitations, drainage of underground waters and paste product runout.

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