New mineralogical and geochemical data of host dolomite evaporitic nature are revealed for the Satka magnesite deposit. Wide-spread collaps-breccias, tepee-structures, doublets of gray and white interlayer (twin lamella) in host dark-gray dolomites and wedge-shaped nests of secondary recrystallized dolomites are the result of dissolution of evaporitic sulfate minerals. Accumulations of fine-grained hexagonal hematite crystals in dolomite nests were obtained with help of electronic microscope. In dolomite nests it is observed the increasing of FeO, Mn and 87Sr. The same feature is peculiar for magnesite from ore bodies. These observations correspond to the model of seepage-reflux of Mg-bearing evaporitic brines for metasomatic sparry magnesites of the Satka deposit.