This paper presents new mineralogical data from the small uranium occurrence Soseň-Kosobody near Jesenice in the Rakovník District in the western part of the Czech Republic. The uranium anomaly, discovered in early 50th, was explored by two shafts No 33 and No 36 in 1954–1959 and subsequently by boreholes and exploration trenches in 1970–1972 (Mrázek 1972). The host rock of the mineralization is Neoproterozioc phyllite of the Teplá-Barrandian Zone or Bohemicum (Fig. 1); the contact with granite and granodiorite of the Čistá-Jesenice Composite Pluton is exposed in the proximity. The studied samples were collected in 2019–2020 and analysed by XRF and ICP-MS for bulk rock chemistry, and by EMPA and XRD for mineralogy (see Table 1 and 2). The samples with primary hydrothermal mineralization were collected in a dump of a shaft No 33(Fig. 2a, b, f), and those with supergene mineralization at a shaft No 36 (Fig. 2c, d). The mineralization occurs in cm thick, discordant brecciated veinlets with sharp contacts (Fig. 3a, b) composed of quartz, K-Ba-feldspar (potassium feldspar to hyalophane), with minor spessartine garnet, pyrite, TiO2 and kaolinite or dickite (Fig. 4a–f). The presence of carbonates and/or baryte mentioned by Mrázek (1972) was not confirmed. The primary mineralization is rather weak and dispersed. An inhomogeneous U-Ca-Pb phosphate phase represents the sole primary uranium carrier. Molybdenum or Mo-S bearing phase forms tiny intergrowths with this phase. Associated ore mineralization is also low-grade, being represented by sphalerite, galena and chalcopyrite (see Figs. 4g–h, Tables 3–5). The samples of supergene mineralization contain common metatorbernite (with minor torbernite) and corkite, accompanied by kaolinite and abundant “limonite” (goethite). The mineralogical and compositional data indicate the origin of mineralization from silica-K-Ba-U-P-Mn-rich fluids poor in sulphate anion. Although the ore mineralization (Pb, Zn, Cu, As and Mo) accompanying uranium is of a low grade, especially the elevated Mo content indicates genetic connection with the Hůrky Mo-REE deposit, which is also associated with the Čistá-Jesenice Composite Pluton (see Klomínský 1962, Kopecký et al. 1997).