The reserve base is 3400 million tonnes of magnesium content. Identified world resources of magnesite total some 12 billion tonnes, and there are also large resources of magnesium-bearing substitutes such as dolomite, brucite and olivine. Furthermore, magnesium compounds can be recovered economically from well and lake brines and from sea water. The latter, which contains 0,13% by weight of magnesium, is a major source of metal and compounds. The article analysis the production possibilities of Slovak magnesite industry The object of this article are the external elements and the possibilities of survival of the Slovak magnesit industry.