Institute of Earth Sciences, Belgorod State University Belgorod, Russia:

V. V. Khaustov, Professor, Doctor of Geological and Mineralogical Sciences, khaustov@bsu.edu.ru
N. A. Lukyanenko, Post-Graduate Student
N. B. Agarkov, Post-Graduate Student
V. N. Tyupin, Professor, Doctor of Engineering Sciences, Professor

Tyrnyauz tungsten–molybdenum deposit is located within the Elbrus volcanic region, on the left bank of the river Baksan. The deposit is associated with a series of granitoids formed during the period of activation of tectonic–magmatic processes at the southern boundary of the Scythian plate in the Meso-Cenozoic, and embedded in carbonate, terrigenous and volcanic rocks of the Devonian, Carboniferous and Jurassic. Groundwater that forms the drainage runoff is mainly fissure or fissure-vein water. In the field, groundwater belongs to an integrated system, within which, subject to the feeding conditions, and to the nature of circulation and chemical composition, two hydrogeological zones are clearly distinguished alongside with a mixing subzone between them. Between 1964 and 1997, the average annual water inflow into the underground openings of Molybdenum Mine varied from 122.4 m³/h in 1965 to 629.0 m³/h in 1986. In recent years of observations, the average annual water inflow ranged from 427.0 m³/h (1993) to 420.0 m3/h (1997). According to the measurements in October–November 2018, the water inflow in Molybdenum Mine was 494.3 m3/h. By the data of VIOGEM, in mid-September 2020, the inflow of groundwater into the mine amounted to 571 m³/h. The temperature of drainage waters in the Central ore field of the deposit, on the upper level of 2767 m during the study period ranged from 4.0 to 5.0 °C. Infrared photography using thermal imager detected hidden glaciers and flows of cold groundwater inside the rock mass.

1. Rybnikova L. S., Rybnikov P. A. Hydrogeological investigations in mining areas in the post-operational stage. Ground water of Eastern Russia : Proceedings of All-Russian Conference on Russia’s East Ground Water (XXII Conference on Ground Water in Siberia and Russian Far East with international participation). Novosibirsk : Izdatelstvo Novosibirskogo natsionalnogo issledovatelskogo gosudarstvennogo universiteta, 2018. pp. 403–408.
2. Khaustov V. V., Ustiugov D. L. Formation of drainage waters of Tyrnyauz deposit in ecological aspect. IOP Conference Series: Earth and Environmental Science. 2017. Vol. 87, Iss. 4. 042006. DOI: 10.1088/1755-1315/87/4/042006
3. Gramenitskiy E. N., Kononov O. V. Mineral associations and Mo–W ore types of the Slepaya zalezh’ orebody at the Tyrnyauz deposit. Geology of Ore Deposits. 2019. Vol. 61, No. 4. pp. 359–380.
4. Weihua Wu, Shuyi Qu, Werner Nel, Junfeng Ji. The impact of natural weathering and mining on heavy metal accumulation in the karst areas of the Pearl River Basin, China. Science of The Total Environment. 2020. Vol. 734. 139480. DOI: 10.1016/j.scitotenv.2020.139480
5. Kalov R. O., Bekarov G. A. Assessment of Post-Mining Condition of a Tungsten-Molybdenum Depositand Possibility of its New Development. Gornaya promyshlennost. 2020. No. 6. pp. 80–83.
6. Gramenitskaya P. N., Gramenitskiy E. N., Kononov O. V. Chemical types of amphiboles from the Tyrnyauz deposit. Moscow University Geology Bulletin. 2013. Vol. 68, No. 4. pp. 242–252.
7. Vrublevskiy M. I. Mineral water as an evidence of geological structure of the Central Caucasus. Leningrad : Izdatelstvo LGU, 1962. 255 p.
8. Aetov A. U., Usmanov R. A., Mazanov S. V., Gumerov F. M. Treatment of molybdenum-containing wastewater in supercritical environment. Tsvetnye Metally. 2020. No. 7. pp. 68–73. DOI: 10.17580/tsm.2020.07.09
9. Khaustov V. V., Lushnikov E. A. Karst marble deposit Tyrnyauz. Izvestiya Yugo-Zapadnogo gosudarstvennogo universiteta. Ser. Tekhnika i tekhnologii. 2011. No. 1. pp. 76–83.
10. Kuzevanov K. I., Kuzevanov K. K. Dutova E. M., Pokrovskiy V. D. Hydrogeological conditions of the Bakchar iron ore deposit and preliminary estimation of water inflows. Izvestiya Sibirskogo otdeleniya Sektsii nauk o Zemle Rossiyskoy akademii estestvennykh nauk. Geologiya, razvedka i razrabotka mestorozhdeniy poleznykh iskopayemykh. 2018. Vol. 41, No. 4(65). pp. 22–36.
11. Purgina D., Strokova L., Kuzevanov K. Modeling of changing hydrogeological conditions during construction of pier foundations on the Kama river bank. IOP Conference Series: Earth and Environmental Science. 2016. Vol. 33, No. 1. 012046. DOI: 10.1088/1755-1315/33/1/012046
12. Khaustov V. V. Ground water and deep-level geodynamics in Tyrnyauz. Kursk : Izdatelstvo Kurskogo gosudarstvennogo tekhnicheskogo universiteta, 2009. 177 p.
13. Kharkhordin I. L., Gurin A. N., Nazima V. V., Ivanov I. N. Organization of a system of hydromechanical monitoring on Lomonosov diamond deposit. Gornyi Zhurnal. 2012. No. 7. pp. 40–43.