Uranium-containing glass samples with an age of 140–145 million years were collected within the volcanic rocks largest volcanic-related uranium ore deposit in world. Main features their composition are high concentrations silica and uranium, for this type. In contrast to this, ages fresh (unaltered) low-silica natural glasses a basic (basalts) usually do not exceed few years. The is unstable at...

CO2 + O2 is a relatively mature, neutral, in situ leaching process that has been widely used. However, the decrease uranium concentration solution during production become serious problem western section of south ore belt Shihongtan deposit Xinjiang, China. In order to solve this problem, mineralogy and batch tests were carried out explore reason for low resource efficiency determine better par...

Abstract The origins of many supergiant ore deposits remain unresolved because the factors responsible for such extreme metal enrichments are not understood. One factor critical importance is timing mineralization. However, information commonly confounded by difficulty dating minerals. world's largest uranium resource at Olympic Dam, South Australia, exceptional high abundance U allows U-Pb Dam...

[1] Secondary calcite shelfstone deposits in caves can be used to precisely measure tilting over geologic timescales. Calcite deposited along the edges of former pools can be surveyed to within a single millimeter, and can be dated using uranium-series disequilibrium. Two caves in the southern Sierra Nevada, California, contain tilted calcite deposits of glacial age. A third cave contains a sim...

Abstract The primary exploration objective of Qiharigetu Sandstone-type Uranium (SU) deposit in the Erenhot Basin China is to understand stratigraphy, lithology and fault distribution target layer. Various geophysical techniques including gravity, magnetic, electromagnetic 2D seismic have been proved not very effective due its shallow depth burial small differences between layers. A specific 3D...

Uranium contains only one naturally occurring isotope, 235U, which will sustain a nuclear chain reaction using normal water to moderate and reflect neutrons. At present, this isotope is present in low abundance (0.72%), requiring enrichment to 3% or greater for effective use in commercial nuclear reactors. Two billion years ago, however, the natural abundance of 235U was approximately 3%. Evide...

The oxi-hydroxides, present at trace level in uranium mill tailings, are responsible of about 70% of the 226 radium sorption, half being fixed on crystallized forms. This radionuclide (half time = 1622y), present at high level (50 to 100kBq.kg), can be released in groundwater, involving a possible contamination of the food chain (actual concentration limit = 0.37Bq.l). So, it is very important ...