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The main objective of the study is to characterize the geological, geochemical and mineralogical minerals tailings panning Emeralds Holy Mount-TO aspects. The mineralized zone of the mine is described as being formed by maficultramafic volcanic rocks Metavulcano-Sedimentary Sequence of the Rio Coco, and that represented by two distinct units: a composite of magnesium schists intercalated with metasediments basal unit; and an upper unit composed of amphibolite and metasediments. The stone powder obtained by grinding the mineral tailings shows 73% of particles with a particle size "sand fraction" (0.06 to 2 mm) and specific surface area of 0,486 m2 g-1 (BET). The whole rock geochemical composition revealed that the rock dust has 7.9% CaO, 9.8% MgO, 2.2% K2O, and various other elements of plant nutrition. The levels of potentially toxic elements (EPT) are very low and do not provide or environmental contamination risks. The results of the dissolution tests with sulfuric acid attack indicate that 50% of K2O present in the rock dust (biotite-shale) is readily available to plants. The extracted contents of CaO and MgO contents (95%) shows that the material can also be a source of these nutrients, with effects on the acidity of agricultural soils. This information will be fundamental in experimental studies of mineral dissolution and the potential effects of rock dust in plant nutrition, in addition to being useful to the registration and commercialization of this agromineral.

O potencial de agrominerais silicáticos como fonte de nutrientes na agricultura tropical