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This investigation reports the results of a study realized in areas related to the development of sand mining activities, which belong to CRS-Mineracao Industria e Comercio Ltd. and Sibelco Mineracao Ltd. Both areas are located around Analândia municipality, nearly in the center of Sao Paulo State, Brazil. Flow rate and hydrochemical analyses were realized over different periods of time, with the aim of evaluating the possibility of release of several constituents to the liquid phase, which may be a source of pollution of the surface hydrological resources. This is because some tributaries from the Corumbatai River may be suffering contamination, implying on the impoverishment of the water quality that is a very important resource in the region, as it is extensively used for drinking purposes, among others.

Flow rate and hydrochemistry in areas of sand mining activities