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The expansion of iron mining activities in Brazil and the discovery of the speleological richness in ferriferous rocks called the attention of companies, environmental agencies and researchers about the need to know in deeper level the karstic environments. The CONAMA Resolution No. 347 of 2004 establishes the minimum area of influence on speleological heritage already identified. In this sense, the studies regarding water connections around the cavities previously mentioned, is part of a project which the main goal is to understand the hydro dynamic in the surroundings of the 34 underground natural cavities located in in banded ferriferous formations and lateritic canga located in the mines of Serra Norte, Carajás/PA. This project involved experimental procedures performed during 5 years, applying fluorescent chemical tracers, with different spacings, in areas of mining operations, to analyze the presence of markers inside the cavities. The results show that the smaller and shallower cavities have more local hydro influence, and that the presence of soil and vegetation are likely to reduce the hydro connection. The hydro flow through the canga is much influenced by the analyzed canga volume, due to karstic fissures and discontinuity in this environment. In addition, the work conducted by the field collaborators while carefully extracting the samples is something to be valued as of extreme importance also in future researches, considering the anthropogenic and animal presence on the inside and surroundings of the cavities are considerable relevance.

águas subterrâneas

Comparação Entre Traçadores Químicos Fluorescentes e Seus Respectivos Resultados Obtidos Através da Metodologia de Injeção de Traçadores no Entorno de Cavidades Para Detecção de Influência Hídrica. Estudo de Caso em Serra Norte, Carajás/PA