HYDROGEOLOGICAL FORECASTS FOR DEWATERING DIAMOND DEPOSIT NAMED AFTER V. GRIB

• Main Authors: Lyudmila A. Elantseva, Denis A. Zaitsev, Sergey V. Fomenko
• Format: Article
• Language: Russian
• Published: Tomsk Polytechnic University 2019-07-01
• Series: Известия Томского политехнического университета: Инжиниринг георесурсов
• Subjects: managed dewatering; pumping wells; open pit drainage; hydrogeological forecasts; numerical modeling; radial drainage; horizontal drainage wells
• Online Access: http://izvestiya.tpu.ru/archive/article/view/2176/1995

The relevance of the research is caused by the need to involve in industrial using a diamond deposit, very complicated from hydro-geological point of view, in which ore production is carried out with important dewatering activities aimed to create a safe mining conditions. Forecasting the managed dewatering and changes in hydro-geological conditions during deposit exploitation is a complex problem, which requires a consideration of many natural and mining factors and development of methodical approach for its solution. The main aim of the research is to develop the methodology and implement the hydro-geological forecasts for effective draining during exploitation of diamond deposit named after V. Grib. Objects: drained aquifers and drainage system of open pit. Methods: analysis of using the numerical modeling methods for studying groundwater filtration during dewatering of mineral deposits, numerical modeling. Results. Based on the study of geological and hydrogeological conditions of the diamond deposit named after V. Grib, method of development, drained aquifers, sources of formation of water inflows to the drainage system of the open pit, the numerical model of groundwater filtration have created. In order to drainage of the Padun aquiferous complex at sites where dewatering is not ensured by pumping wells it is recommended to intercept a part of groundwater penetrating into the open pit by means of a drainage devices inside the open pit for dewatering transitional zone between Padun and Mezen sedimentations. The authors proposed the technique for implementing drains inside the open pit in numerical model and carried out the prognosing calculations for effective drainage of the deposit. Using the numerical modeling method the authors proved the efficiency of applying radial drains and horizontal drainage wells to intensify dewatering of the Padun sedimentations in rock massif near the open pit border. The forecast calculations were performed for estimation of seepage height inside the open pit taking into account the mining plan. The timing of drainage devices construction inside the open pit was substantiated.