Using the mineralographic method applied to ores from the Nikitinsky mine, a mineral very similar to pyrite was discovered, but some of its features, such as a pinkish tint, prompted us to subject it to special investigation, after which we arrived at the hypothesis that it might be cobaltite (CoAsS). In addition to cobalt, the mineral aggregates contained chalcopyrite, pyrite, pyrrhotite, and a non-metallic mineral. The presence of cobalt is of great importance, since pyrite and pyrrhotite are frequently found in the Turinsk copper deposits and almost always follow the copper ores. While studying collections from the Dashkesan cobalt deposit, molybdenite (MoS₂) was detected in two samples of cobalt ore. In these samples, molybdenite occurs only at the contact between cobaltite and magnetite, locally forming thin veinlets ranging from fractions of a millimeter to 3–4 mm in thickness; occasionally, the molybdenite is disseminated. The discovery of molybdenite in the Dashkesan cobalt deposit necessitates a detailed examination of the collected material to determine the potential for mineralization both within the cobalt deposit and in its vicinity.