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The role of groundwater testing in uranium exploration in SE Mongolia 2019 ISSN 0007-3938 http://ezaposleni.singidunum.ac.rs/rest/sciNaucniRezultati/oai/record/1/7576 http://bgd.bg/REVIEW_BGS/REVIEW_BGD_2019_3/PDF/61_Vakanjac_B_GeoSci_2019.pdf B. Vakanjac N. Rutherford V. Ristić Vakanjac Many of the uranium deposits of major economic importance are mainly associated with the dispersal of uranium eroded from magmatic or skarn sources and sources are generally related to the ancient craton regions. Primary uranium deposits which are located within volcanic rocks and skarns usually have small exploitation reserves and have high production costs. There are exceptions such as The Rossing Uranium deposit in Namibia (Basson & Greenway, 2004). The most significant uranium deposits have been developed mainly within the sediments rich in organic matter. Ages range from the Middle-Upper Paleozoic to younger than the Mesozoic. Deposits are developed in basins, present in the areas of eroded granites and volcanic rocks and filled with its weathered material. Kazakhstan and Mongolia have the potential for the mentioned younger types of deposit. Roll front uranium deposits are characteristic for arid climate and continental environment. They generally require surface-decomposed uranium-rich sources present in rock outcrops. Dissolved uranium compounds with water are transported through surface decomposed and oxidized sediments of tertiary and younger ages. They are moving up to the point/place where the redox geochemical environment is developed, in these places the uranium concentrates and forms deposits. conferenceObject 197 199 Proceedings of the national conference with international participation „Geosciences 2019“