Relevance. Modern sedimentation conditions are of interest because they can be considered as natural polygons simula-ting facies conditions of sedimentogenesis. The mineralogy of modern lakes can be used to control the degree of evaporation and study the processes of brine evolution, which will help solve the problems of paleoclimatic and paleoecological reconstructions. Seasonal variations in the natural environment are clearly recorded by sediments of lake systems, which can be used as indicators of local climate. Aim. Conducting a detailed diagnosis of the mineral types of sediments of Krasnenkoe lake (both analytical methods and using physicochemical calculations) to understand the genesis of the sediments formed, in particular to clarify their hydrogenous nature. Object. Krasnenkoe lake, located in the territory of the North-Minusinsk basin, in the conditions of a semiarid climate. Methods. The qualitative and quantitative mineral composition of the sediments of Krasnenkoe lake was established using X-ray phase analysis methods, with clay minerals being examined in detail. The chemical composition of the lake waters was determined using titrimetry, ion chromatography (macrocomponents) and inductively coupled plasma mass spectrometry (microcomponents). Physicochemical calculations of the saturation of the lake waters to minerals were made. Results and conclusions. The sediments of Krasnenkoe lake contain minerals of the oxide (quartz), aluminosilicate (clay minerals, feldspars), sulfides (pyrite), carbonates (aragonite, calcite, magnesian calcite, dolomite), sulfates (gypsum, thenardite, burkeite) and halides (halite) groups. At the same time, the values of physicochemical calculations also indicate the presence of magnesite, siderite, strontianite, barite, jarosite and celestine in the sediments. The established mineral species are divided by the genetic principle into two associations: terrigenous and hydrogenous. It should be noted that theoretical calculations of the mineral-forming capacity of waters showed excellent convergence with the analytically established mineral composition of the sediments.