[en] A problem of uranium accumulation in soil horizons of arid areas during Quaternary period is considered (according to the results of landscape-geochemical studies). Mechanism and peculiarities of the formation of uranium secondary accumulations on evaporative geochemical barrier, their dependence on hydrodynamics and morphology of the relief are described. It is proved that uranium secondary accumulations are formed at the expense of uranium mobilization from the area secondary replaced and torn off dispersion halos. The process leads to uranium redistribution in residual secondary halos, which causes their impoverishment and appearance of hypergenous anomalies shifted as to prospective structures. Hypergenous anomaly is used as direct or indirect seach index. A statement that modern exogenous concentrations of uranium are connected geneticallty and spaially with regions of endogenous uranium mineralization is substantiated

[en] Two new types of geochemical barriers: the bioacidic and interground evaporative ones, the effect of which on uranium redistribution in aeration zone must be taken into account during prospecting are considered. Processes of formation of secondary uranium accumulations on the bioacidic geochemical barrier and interground evaporative one in desert and semi-arid regions are shown. Secondary uranium accumulations on bioacidic barrier localize inside of slightly manifested secondary aureole and intensify the degree of contrast of its manifestation on the surface; their basic research importance lies in this fact. Secondary uranium accumutations on interground geochemical barrier can be interpreted as near-surface infilration uranim; concentrations, which are not related directly to primary ores. As a resutt perspective ore-bearing zones can be out of prospecting

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[en] The spectrophotometric method is used to study iron (3) ion interactions with zirconium, thoriUm and scandium ions at simultaneous mononuclear hydrolysis conformably to conditions of coprecipitation with metal hydroxides. Experiments have been conducted at a temperature of 22+-2 deg C and constant ion force I=2.0. The H⁺-ion activity has been measured by means of a glass electrode by the pH-340 meter. Concentration of iron (3), zirconium (4), scandium (3) in the solution was measured to be 3x1a^-4 mol/l, that of thorium (4)=3x10^-4-3x10^-3 mol/l. The results of the investigation performed permit to present particular properties of the neutral hydroxocomplex as a main coprecipitated form of hydrolizing elements as well as to outline the behaviour of microquantities of coprecipitated element both in the solution and collector surface layer

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[en] Particularities of iron (3) ion interaction with zirconium,- thorium- and scandium ions in mononuclear cohydrolysis conformably to coprecipitation with metal hydroxides are found. Absorption spectra were detected by a Specord UVVIS spectro-photometer, the H⁺ ion activity was measured by a pH-340 device. Distinctive properties of a neutral hydrocomplex as a principal coprecipitated form of hydrolyzed elements, as well as the behaviour of microquantities of a coprecipitated element both in solution and a collector surface layer are shown. Coprecipitation of hydrolyzed elements with metal hydroxides is presented as a result of the acid-base interaction of micro- and macrocomponents and as the formation of a corresponding heterohydroxocomplex

[en] In this article the activity TengizChevrOil (TCO) Joint Venture is considered. TCO was established in April 1993 and now among the biggest J V on the territory of former USSR. TCO will carry out important projects connected plans of increasing of gas refinery power and solve serious problems on prepare of qualified personnel and implementation of advanced technologies. (author)

[en] West Kazakhstan - Kumkol pipeline project is being considered. Pipeline's putting into operation will maintain the stability of petroleum supply on Kazakstan refineries and would be profitable on entry to the international market. (author)