In the Baimak-Buribai complex (Southern Urals) rare, well exposed, boninitic rocks (lavas, dikes, and shallow-level intrusive rocks) associated with arc tholeiitic lavas have documented. Even though the boninitic rocks are affected by pervasive low-grade hydrothermal metamorphism and show obvious disequilibrium assemblages, they can be classified on the basis of the relict petrographic characteristics. The criteria are following: the presence of glassy texture, olivine phenocrysts, Cr-spinel microphenocrysts, piroxene phenocrysts; and the absence of phenocryst and groundmass plagioclase. Seven petrologic groups of boninites are identified. By chemical composition, as by petrography, the boninitic rocks are similar to the Tertiary West Pacific low-and intermediate-Ca boninites; in contrast, the arc tholeiitic and calc-alkaline lavas range from high-Mg andesite, to andesite and dacite. The boninitic rocks are basic-intermediate with (in wt %) 52-59 of Si02, 7-19 - MgO, 0.3-0.5 - ТЮ2, 4-10 - CaO < low alkalis and relatively high Cr (up to 1000 ppm) and Ni (up to 400 ppm).