In the article the results of studying the process of extracting cobalt out of Dashkesan high-siliceous cobalt ores are cited. The composition of cobalt ore was studied. It was shown that due to the presence of hard soluble minerals and silica compounds of cobalt in the composition of ore leaching of Co with solutions of hydrochloric acid (7 and 20%) and sulfuric acid (up to 2 N) is insufficiently effective. The method of processing ore that provides for its sulfatizing roasting with further leaching with water is suggested. It was observed that extraction of cobalt by sulfatization at 700⁰C made up 85.52%.