Results of laboratory researches made the base for creation of the technology of complex processing of sideritic ores at Bakalsky deposit is possible are considered in the article. It provides “soft roasting” of ore, magnetic separation and removal of magnesium oxide due to leaching. As a result, it is possible to receive a concentrate with the content of iron 53–60% and content of magnesium oxide 7–9% from the crude ore containing 28–30% of iron and 11–15% of magnesium oxide. The second product of ore processing is magnesium oxide with cleanliness not less than 98%.