MINERALOGICAL AND GEOCHEMICAL FEATURES AND PROSPECTS FOR COMPLEX MINERALIZATION OF THE YAKHTON DEPOSIT (MOUNTAINS CHAKYL-KALYAN, UZBEKISTAN)

Abstract

Link for citation: Sayitov S.S., Tsoi V.D. Mineralogical and geochemical features and prospects for complex mineralization of the Yakhton deposit (mountains Chakyl-Kalyan, Uzbekistan). Bulletin of the Tomsk Polytechnic University. Geo Аssets Engineering, 2023, vol. 334, no. 9, рр. 76-90. In Rus. The relevance. The results of mineralogical and geochemical studies increase the efficiency of exploration work, since reliable knowledge about the distribution of useful components and their finding forms in various types of ores, character of distribution, their intergrowth, sequence of hypogene mineral formation are necessary for predicting the ore potential of objects and determining the directions of geological exploration. In addition, the data of mineralogical and geochemical studies are used in the development of a rational scheme for the enrichment of ores and ensure the complex processing and use of mineral resources. The main aim of the research is to study the material composition and mineralogical and geochemical features of ores and ore-bearing rocks. Object of the research is Yakhton deposit, located in the Chakyl-Kalyan mountains of Uzbekistan, which is known as a skarn tungsten object with associated gold. The results of recent exploration work have shown high prospects of the object for gold mineralization. Industrial grades of gold with a complex of associated components were established in the zones of metasomatic alteration of granitoids. Methods. Chemical composition of ores was studied by silicate, spectral semi-quantitative, ICP-mass spectrometric, atomic absorption, chemical research methods. Mineral composition of ores was established by complex analyzes: optical microscopy in transmitted and reflected light, mineralogical analysis of heavy fractions, X-ray spectral local analysis under a microprobe. Results. Ore and ore-bearing rocks of Yakhton deposit are aluminosilicate (granitoid) and carbonate (skarns, limestones) composition. The ores of the Yakhton deposit are complex. The content of gold in the composition of ores is up to 4,45 g/t, tungsten oxide is up to 0,33 %. In the sequence of increasing concentration clarks in the composition of ores, the following series of elements with clarke concentrations of 40–16500 times was established: Sb<W<Re<Au<Cu<As<Ag<Se<Mo<Te<Bi. The mineral form of gold is native gold, electrum. The pyrite-arsenopyrite paragenetic mineral association is the main productive one for gold mineralization. The manifestation of the gold-silver stage and the telescoping of several paragenetic mineral association are due to the formation of complex ores.

Keywords

• ore
• chemical
• mineral composition
• granitoids
• native gold
• pyrite