Estimation of Geodynamic Activity and Its Effect on Mining-Geological Conditions And Flooding of Potassium Mines I. S. Kopylov Perm State University, Russia Abstract. The problem of forecasting of geodynamic dangerous zones at early stage of potash deposits development is very important for providing safe mining operation. In result of insufficient geological studies and /or improper mine planning more than 80 potash mines have been flooded over the past 150 years in the world. The author and others have developed special techniques for assessing geodynamic (neotectonic) activity of territories - morphoneotectonic, lineament-geodynamic and landscape-geodynamic analyzes based on remote sensing, which allow to reliably establish geoactive zones of various levels - from regional (with areas of hundreds and thousands km2) to local (with areas less than 1 km2). The used methodology includes analysis of the remote sensing data at different scale and defining the spatial distribution of the neotectonic indicators, the most important of which is a density of lineaments. The results of the analysis of modern tectonics and geodynamics in the area of the Verkhnekamskoye potassium salt deposit (Russia, Perm Territory) - the largest in the world and best studied by various geological and geophysical methods, as well as Zhilyanskoe (Kazakhstan) and Tyubegatanskoye (Uzbekistan, Turkmenistan) potassium salt deposits. Keywords: neotectonics, geodynamic active zones, potash mines, remote sensing, photo-interpretation. Introduction other structures, objects, manifestations, Evaluation of the geodynamic activity of the of together with the salt karst, determine the mine lands in the development of any mineral main factors of engineering-geological and deposits, including - potassium salts is an mining-geological conditions (especially the essential element of their geological safety. strength properties of the water-resistant The problem of forecasting geodynamic strata of rocks, due to the increased degree of hazardous zones at an early stage of potash fracture) conducting mining operations in the mining is very important to ensure the safe potash mines. Most accidents at potash mines mining of mineral resources. As a result occur at the boundaries of neotectonic blocks of insufficient geological research and / or of different levels, where, under conditions of inadequate mine planning in the world over high geodynamic activity, areas with a high the past 150 years, more than 80 potash degree of fracture of rocks are formed. mines have been flooded (of which over 30 In recent years, remote sensing methods, in Germany, 6 in Canada, 2 in Russia). It was interpretation of satellite images for studying established that the overwhelming majority regional interblock faults [2], environmental of accidents in mines occur under conditions problems of mining in karst areas [1] and of high geodynamic activity of mountain geodynamic zoning of mine lands [5, 6, 7 have ranges, complicated by high fracturing of been widely used to assess the geodynamic rocks [1, 3, 5]. activity of territories of various objects. ]. The newest tectonics and modern In this article, we present an example of geodynamics, pronounced geodynamic successful use of remote sensing data to solve active zones, discontinuous dislocations and the problems of the geological safety of mines. 16 Wolkersdorfer, Ch.; Khayrulina, E.; Polyakova, S.; Bogush, A. (Editors) IMWA 2019 “Mine Water: Technological and Ecological Challenges” Methodology for assessing class (x + s) ÷ (x + 2s); 5 class (x + 2s) ÷ (x geodynamic activity + 3s); 6 class > (x + 3s). It is quite confident Geodynamic active zones (or simply geo- that they reflect, respectively, various degrees active zones) are areas of the earth’s crust that of geodynamic activity (from conditionally are active at the present stage of neotectonic stable to conditionally extremely high development, characterized by increased activity). In this case, geoactive zones fracturing, permeability, manifestations of include areas with very high and extremely discontinuous tectonics, seismicity and other high fracturing, and in some cases - areas processes. They are a powerful factor in the with high fracturing, characterized by high formation and alteration of the ecological, contrast relative to the background. The hydrogeological, and geological conditions of author identifies 9 ranks of geoactive zones the territories of the development of mineral by dimension: 1 - planetary zones (several resources, and often lead to accidents in hundred thousand km2), 2 - subplanetary mines. zones (tens of thousand km2), 3 - geozones The basis of the methodology for (first tens of thousand km2), 4 - megazones studying and evaluating geodynamic hazards (first thousand). km2), 5 - macrozones (several (geodynamic active zones) in areas of existing hundreds of km2), 6 - mezozones (up to 100 and projected potash mines can be a systemic km2), 7 - local I order zones (several tens of lineament-geodynamic analysis based on km2), 8 - local II order zones (several km2), remote aerospace geological methods in 9 - local III order zones (shares and units combination with geophysical, structural km2). As a rule, large geo-active zones have geomorphological, hydrogeological and a complex mosaic structure and upon more geochemical methods. detailed study, they are divided into lower- The author and others have developed level zones with different degrees of activity. special methods for assessing the geodynamic The analysis consists in obtaining a lineament- (neotectonic) activity of territories - block model by interpreting satellite images, morphoneotectonic, lineament-geodynamic ranking the territory according to the degree and landscape-geodynamic analyzes based of geodynamic activity and building its on remote sensing, which allow to reliably cartographic evaluation models, comparing establish geoactive zones of various levels - it with geophysical fields. Decoding of digital from regional (with areas of hundreds and space images, data processing, geographic thousands km2) to local (with areas less information cartographic modeling is carried than 1 km2). Lineament analysis based on out using GIS technologies in Arc GIS and remote sensing studies in combination with ArcView GIS. geological and geophysical data proved to be Below are some examples of identifying a useful tool for characterizing the regional geodynamic active zones based on the analysis and local geodynamic field [5, 6, 7]. of modern tectonics and geodynamics based Criteria for assessing geodynamic on aerospace research in various salt-bearing (neotectonic) activity are various calculated regions: in the Verkhnekamskoye potassium indicators. One of the most important salt deposit (Russia, Perm region), the largest indicators of geoactive zones is the increased and best studied in the world by various density of tectonic disturbances (lineaments), geological and geophysical methods and also expressed in their total length per unit area. Zhilyansky (Kazakhstan) and Tubegatansky The ranking of geodynamic activity by this (Uzbekistan and Turkmenistan) deposits of indicator is carried out according to the potassium salts. In areas poorly studied by gradations, taking into account the classes aerospace methods, deciphering was carried of statistical distribution according to their out over several (5-8) levels of generalization, intensity (usually 6 grades are distinguished ranging from survey and regional 1:10 000 000- taking into account the arithmetic mean – 1: 1 000 000 over large areas (hundreds of «x» and the standard deviation – «s»): 1 class thousands of km2) to detailed work 1:50 000 <(x-s); 2 class (x-s) ÷ x; 3 class x ÷ (x + s); 4 and 1:25 000 in the mining allotment areas. Wolkersdorfer, Ch.; Khayrulina, E.; Polyakova, S.; Bogush, A. (Editors) 17 IMWA 2019 “Mine Water: Technological and Ecological Challenges” Research results and discussion mine No. 2 (2014) occurred precisely in the The Verkhnekamskoye potassium- geodynamic active zones. magnesium salt deposit (VPMSD) is the In 2010, special work was carried out to world’s largest deposit of potassium and compile a map of the geodynamic active zones potassium-magnesium salts. After its of the Perm Territory at a scale of 1: 500,000 discovery in 1925, over 1000 works were and at the Verkhnekamskoye field at a scale published, highlighting its geological structure of 1: 100,000 (I.S. Kopylov, V.Z. Khursik). and genesis, several large monographs were According to the results of the interpretation published, a large number of maps and of digital spectral space images on the schemes of discontinuous tectonics and territory of VPMSD, more than 1,800 straight faults were compiled (e.g. R.N Valeev, 1974; lineaments identified with tectonic basement M.I. Denisov, 1980; G.G. Kassin, 1985, and sedimentary cover disturbances were 1991; N.M. Dzhinoridze, 1987; V.P. Belyaev, identified. 1989; L. Noyaksova, 1990; T.V. Kharitonov, According to the regional geodynamic 1992; I.A. Sanfirov, G.G. Kassin, 1993; estimate of a scale of 1: 500,000, it was B.M. Golubev, 1998; A.I. Kudryashov, 2001, established that the territory of VPMSD 2004, 2013; I.A. Sanfirov, S.G. Bychkov, 2009; is within geo-active zones of the regional V.P. Kolesnikov, 2010; V V. Belkin, 2010; level with an area of more than 1,000 km2. G.G Kassin, V.V. Filatov, 2011). According to the zoning scale of 1: 100,000, The Verkhnekamskoye field isover 50 geoactive zones ranging in size from characterized