Currently, uranium production occupies a decisive place in the world energy industry. In Kazakhstan, to meet demand for uranium, hydrogenous deposits with technologically and economically favorable natural indicators are being developed, including large Semizbai deposit. The deposit by genesis belongs hydrothermal-hydrogenous polygenic type terrigenous sandy-clayey deposits. As result of geolog...

In this paper the results of a leaching kinetics study of bauxite ore with sodium hydroxide are presented. The effect of ore particle size, sodium hydroxide concentration and reaction temperature on the Al2O3 extraction rate was determined. The results obtained showed that 99% of Al2O3 was leached out using -200+270 mesh ore particle size at a reaction temperature of 105 °C for 60 min reaction ...

by Jasimuddin U. Ahmed U, Fntil the late 1970s, radon and its daughter products were regarded as radiation health hazards only encountered in the mining and milling of uranium. This notion has dramatically changed as a result of widespread indoor measurements of radon in many parts of the world. Increased radon concentrations in dwellings, for example, have been noted in countries in the temper...

Characteristic spectral parameters such as the wavelength and depth of absorption bands are widely used to quantitatively estimate the composition of samples from hyperspectral reflectance data in soil science, mineralogy as well as vegetation study. However, little research has been conducted on the spectral characteristic of rare earth elements (REE) and their relationship with chemical compo...

The present work analyzes the specimens of orthite (allanite) mineral ores obtained from Vernadsky mine (Slyudyanka River, Irkutsk region) and Yuzhno-Bogatyrskoye occurrence (Kuznetsk Alatau). elemental chemical composition ore was determined by electronic microscopy specimen’s surface. study establishes that uranium thorium in are mainly represented their separate minerals, while content phase...

In developing countries, rapid industrialization without environmental controls has resulted in heavy metal contamination of communities. We hypothesized that residential neighborhoods located near ore industries in three northern Mexican cities would be heavily polluted with multiple contaminants (arsenic, cadmium, and lead) and that these sites would be point sources for the heavy metals. To ...

The paper reports recent observations among Czech uranium miners. The study includes two groups of underground miners exposed in periods 1948-63 and 1968-88. A total of 9960 workers have been followed to the end of 1999 representing 267 thousands person-years. By the end of 1999, a total of 29 cases of leukaemia were observed. The standardized mortality ratio is 1.31, 90%CI: 0.88-1.88. In relat...