Basic Structural and Geological Features of the Stolovac Uranium Mineral Occurrence, Eastern Serbia

The uranium mineral occurrence of Stolovac is located in the middle of a Permian red sandstone formation, the westernmost east‐Serbian Carpatho‐Balkan metallogenic province, or the Ridanj–Krepoljin ore zone. It was found by geological radiometry survey at the anomaly spots indicated by aerial gamma‐ray spectrometry (AGS). The task of anomaly identification is to accurately locate the AGS‐recorded anomalies in the field, to define the source of anomalous radioactivity (natural or artificial), to understand the relationship between the anomalous radioactivity and the given structural and geological situation, and to sample the material. The geological radiometry survey at scale 1:25,000 indicated increased radioactivity in gray sandstones of the Stolova?ki stream bed in Stolovac, some 40 km NE of Para?in. The instrument used was a scintillometer SSP 2NF, and the measured radioactivity was 10‐fold higher than the local background level. Of all the customary field work, the greatest volume (trenching, drilling and accessory testing) was carried out in Stolovac; other radioactivity anomalies in the red sandstone formation remained inadequately explored and are the subject of this paper. The 3‐year exploration in uranium at Stolovac indicated sandstone‐type infiltrated uranium mineralization in sandstones in the middle of the Permian red sandstone formation: a complex called “variegated rocks”.