Uralgiproruda Institute, Ekaterinburg, Russia:

E. A. Chibireva, Chief Hydrogeological Specialist, mail@ugruda.ru

The hydrogeological evaluation of Tarynnakh and Gorkitsky iron ore projects was accomplished in the framework of the technical-and-economic assessment of permanent exploration quality standards for appraisal of Tarynnakh and Gorkitsky iron ore province reserves by Uralgiproruda Institute. The studies were based on the data of the preliminary exploration of Charo-Tokkin iron ore, preliminary exploration of Gorkitsky deposit and detailed exploration of Tarynnakh deposit in compliance with the requirements imposed on technical-and-economic assessment of permanent exploration quality standards. The technical-and-economic assessment of the quality standards analyzed hybrid open pit/underground mining method. Ground water inflow in project open pit mines was predicted by combination of balance and hydrodynamic methods, which improved probability of inflow rates predicted. After completion of open pit mining and closing-down of pit water discharge, it is planned to forward open pit mine water in the underground mine drainage system by means of network of drainage holes. The complicated hydrogeological conditions of open pit mining at Gorkitsky deposit preconditioned the choice of a drainage system composed of internal and external open pit mine pumping systems, approved by ecological and economic performance. Water pumping from Tarynnakh open pit mines uses surface drainage system, with water accumulation in advance sumps. In the course of underground mining, water pumping from the mine will use multistage water drainage. After technical-and-economic evaluation of alternatives based on technical solutions, the choice was made in favor of the variant best accounting for the interests of the state and subsoil users and ensuring complete extraction of mineral reserves. As a result, the Federal Agency for Mineral Resources of Russia approved the Tarynnakh and Gorkitsky reserves, which allowed continuing the hydrogeological studies in the iron ore province by means of integrated engineering geological surveying aimed to refine the available data towards further planning and mining of the deposits.

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