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Dom Silverio, southeastern Minas Gerais, was extensively mined until the middle of the last century. The manganese protore is made up of a diversity of lithotypes, including gondites and queluzites. The study of the mineralogy, mineral chemistry and the interpretation of the genesis of the deposit is the purpose of this paper. The banded protore is made up of variable amounts of spessartite, rhodonite, rhodocrosite, manganocummingtonite, pyroxmangite, tephroite and pyrophanite, besides non-manganiferous minerals such as quartz, calcite, dolomite, forsterite, diopside, biotite, titanite, apatite, pyrite, chalcopyrite, cobaltite, and niccolite . The banding of the protore and the intercalation of quartzite and metapelites suggest a sedimentary origin with possible vulcanogenic contribution of Mn. The sedimentary rocks were metamorphosed under lower amphibolite facies during the Brasiliano tectonometamorphic event. Later processes led to the generation of veins composed of a new generation of manganese silicates and carbonates formed by metassomatic remobilization. Evidence of remobilization of As, S, Co Ni and S are indicated by substitutional textures involving arsenides and sulfoarsenides such as niccolite, cobaltite, maucherite and gersdorffite, as well as antimonides and sulfoantimonides such as breithauptite and hauchecornite, which are not mentioned in the consulted literature concerning Mn-deposits around the world. Finally, supergenic alteration of the protore caused the generation of the oxide-facies Mn-deposits.

DISTRITO MANGANESÍFERO DE SAÚDE, GRUPO DOM SILVÉRIO - MG: CARACTERIZAÇÃO MINERALÓGICA E PETROGRÁFICA DO PROTOMINÉRIO