I mentioned roll-front deposits in response to one of your questions about uranium deposits. The formation of a roll-front orebody is controlled by a change in electrochemical conditions along a groundwater flow path. That is, in shallow oxygenated groundwater, uranium is transported in a hexavalent (U+6) state, but as groundwater reaches downgradient areas where reducing conditions are established through the accumulation of buried organic matter, the dissolved uranium transitions to a tetravalent (U+4) state, forming a uranium ore mineral such as uraninite (UO2 ... although U3O8 might also be present).
You might find the following website to be helpful.
https://world-nuclear.org/information-library/nuclear-fuel-cycle/uranium-resources/geology-of-uranium-deposits
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