## 3 Results and Discussion
### Mineralogical Futures  
In the Lisava sector, the uranium deposits are of a tabular sandstone type, and the mineralization is described as consisting of two generations of pitchblende, sooty pitchblende and uraniferous anthraxolite associated with minor, galena, chalcopyrite, pyrite and sphalerite, which are frequently related with bitumen [19,20].  
In the oxidized zone, torbernite, autunite and uranium black products appear [19]. The organic carbon content in this zone can be up to seven percent. Pitchblende occurs as finely dispersed inclusions mainly in solid bitumen and carbonaceous matter, in fine- and medium-grained sandstones, siltstones and carbonaceous and bituminous shales. Locally, pitchblende is found in the griststone and sandstone matrix. Rarely, uranium black products and pitchblende, which are located near bitumen, form bands or small layers and strings that fill cracks along fissures [19,20].  
The mineralogical analysis of the rock samples (uraniferous red sandstone) collected from the dump in the vicinity of soil sampling points 11 and 23, where the uranium concentration was highest, reflected some of the mineralogical characteristics of the uranium ore (Figure 10). Uranium-bearing minerals were found to be less associated with coaly matter than expected. Instead, the carbonaceous matter contained frequent sulfide grains, sometimes displaying biogenic structures such as framboidal aggregates or mineralized vegetal cell structures. The most frequent sulfides were sphalerite, galena, pyrite, and subordinate chalcopyrite, which is sometimes associated with barite, which also appears in pore-filling aggregates. Uranium minerals were mostly observed in discontinuous pore-filling aggregates associated with rutile and possibly anatase. The mineral phases identified in the available samples were brannerite, coffinite and pitchblende, usually forming crusts on rutile or cementing it. As a rule, the U-minerals found were fine-grained and involved in intergrowth with other phases, typically with rutile.  
\begin{table}
\begin{tabular}{c c c c c c c c} \hline  & \({}^{238}\)U & \({}^{232}\)Th & \({}^{40}\)K & Raeq & DR & Hex & RLI \\ \hline \({}^{238}\)U & 1 & & & & & & \\ \({}^{232}\)Th & \(-0.350\) & 1 & & & & & \\ \({}^{40}\)K & \(0.215\) & \(0.091\) & 1 & & & & \\ Raeq & \(0.986\) & \(-0.189\) & \(0.268\) & 1 & & & \\ DR & \(0.119\) & \(-0.202\) & \(0.270\) & \(1.000\) & \(1\) & & \\ Hex & \(0.986\) & \(-0.189\) & \(0.267\) & \(1.000\) & \(1.000\) & \(1\) & \\ RLI & \(0.567\) & \(-0.157\) & \(0.193\) & \(0.563\) & \(0.564\) & \(0.563\) & \(1\) \\ \hline \end{tabular}
\end{table}
Table 4: [PERSON]’s correlation coefficients matrix between \({}^{238}\)U, \({}^{232}\)Th and \({}^{40}\)K and Raeq, DR, Hex and RLI.  
Figure 10: SEM images of uranium red sandstone mineral assemblages. (**A**) Coffinite (lighter) crust on pore-filling authigenic rutile (dark grey) associated with iron-rich chlorite. (**B**) Detritic zircon and pore-filling aggregates with chlorite and rutile. Brannerite overgrowing rutile needles. (**C**) Detail with idiomorphic brannerite on rutile. (**D**) Pore-filling structures composed of Ti-U oxides (left) and Fe-rich chlorite (right). (**E**) Detail with concentric structure with a rutile and carbonaceous matter core and a mantle formed by rutile intergrown with brannerite. (**F**) Brannerite aggregate, probably replacing rutile (present as lower-scattering ribbons in the upper-right part of the grain). (**G**) Pore-filling with equant TiO\({}_{2}\) crystals (rutile or anatase) forming crusts overgrown or cemented by brannerite. (**H**) Mineralized vegetal cell structures with pyrite and subordinate galena preserved in the carbonaceous matter. (**I**) Aggregates of framboidal pyrite composed of octahedral crystals set in carbonaceous matter. (**J**) Galena grains included in carbonaceous matter. (**K**) Barite deposited on pore-filling chlorite books. (**L**) Sphalerite associated with carbonaceous matter and clay minerals.