With the aim of establishing a geochemical reference base for stream sediments and surface waters in one of the country’s most important regions in terms of mining and human occupation, the project involves the systematic collection of data, the creation of chemical element distribution maps, and the definition of background and baseline values, focusing on potentially toxic elements (PTEs) such as arsenic (As), cadmium (Cd), chromium (Cr), copper (Cu), mercury (Hg), manganese (Mn), nickel (Ni), lead (Pb), and zinc (Zn).
The proposal arises from the need to understand the complex interaction between natural and anthropogenic factors that shape the chemical composition of the surface environment in the Iron Quadrangle (QF), a region marked by intense mining, industrial, and urban activities, with multiple potential sources of contamination. Vale has a strategic interest in deepening its knowledge of the local geochemical signature, contributing to environmental safety and long-term sustainable development.
Although there have been previous studies on the geochemistry of QF, many of them were carried out for mineral prospecting or in specific areas. There are still few surveys with dense sampling and an integrated environmental approach that cover the entire region. In addition, the reference values currently available for soils are not sufficient to adequately assess the quality of water and stream sediments, especially in a territory with such geological diversity. The project plans to fill this gap by providing robust, up-to-date data that can support monitoring, environmental management, and decision-making.




