Abstract <p>The throughout lightening up to the whitening of basement granites, ore-bearing alluvial sediments, volcanogenic-sedimentary strata and fracture zones of plateau basalts are considered using the example of the Vershinnoe uranium ore deposit of the Khiagda ore field of the Vitim uranium ore region. The contribution of deep carbonated waters with high reducing capacity to this process is shown. The ore-generating, ore-localizing, and ore-preserving role of the lightening of the ore-bearing alluvial sediments is proved. The accumulation of uranium in deposits of this genetic type occurs at an immobile reducing geochemical barrier.</p>