Abstract The episode of widespread organic carbon deposition marked by peak black shale sedimentation during the Palaeoproterozoic is also reflected in exceptionally abundant graphite deposits this age. Worldwide anoxic/euxinic sediments were preserved as a deep crustal reservoir both carbon, and sulphur accompanying pyrite, commonly >1 wt %. carbon- sulphur-rich crust interacted with mafic ...

Abstract Promising green leaching technique was used by Humic acid (HA) for removing uranium from Abu Zeneima spent residue environmental safety and cost-effective leaching. The studied is outlet vat process using sulfuric of carbonaceous shale ore material with initial assays 185 ppm, which representing a hazardous waste. overall efficiency assaying 93% humic at curing temperature 70 °C, 13% H...


 Some aspects of environmental hazard within uranium mining areas are considered. The content in the environment components (rocks, soils, underground and surface waters) central part Ukrainian Shield beyond area is analyzed on example Michurinske ore field. It emphasized that man-made sources natural origin should be considered more broadly than just waste dumps from processing enterpris...