384 risk to the health of people living nearby due to accidental ingestion of toxic elements present in mining sites. KEYWORDS Bioaccessibility, mobile device, mine tailings, risk assessment, Environmental Monitoring 1.- SCOPE The work focuses on the theme of the conference "“Environmental stewardship and nature-based solutions” and “Post-mining areas, reclamation, and revitalisation”. This topic focuses on showing that moving towards world-class green mining requires the use of technologies that allow monitoring the chemical stability and toxicity of tailings and mine sites. This work demonstrates that the quantification of the bioaccessibility of toxic substances present in mining soils, with MABIOMET, makes it possible to differentiate between a potentially dangerous source of contamination from one with low risk to human health. Therefore, it significantly reduces the number of sites classified as critical, thus optimizing the prioritization of remediation and the use of resources in their recovery. 2.- INTRODUCTION The increasing number of potentially contaminated sites poses a significant challenge to the scientific community, demanding improved approaches for assessing human exposure to toxic elements in soils. Conventional exposure assessments based solely on total soil concentrations are increasingly recognized as inadequate, as only a fraction of contaminants is bioavailable. In contrast, soil ingestion remains the most critical exposure pathway, particularly for children. The release and availability of contaminants in the gastrointestinal tract depend on elemental speciation and soil physicochemical properties, underscoring the importance of incorporating bioaccessibility into health risk assessments (Rosende M., Miro M., 2013; Rosende et al, 2013; Cave et al, 2016). In this context, the Bioaccessibility Research Group of Europe (BARGE) developed the Unified Bioaccessibility Method (UBM), a rapid and reliable in vitro approach standardized as ISO 17924 (ISO, 2018) In 2022, it was estimated that more than 14 billion metric tons of mining tailings were produced annually worldwide from the extraction of metals and minerals. Considering the current level of development in tailings management and that environmental protection is a priority for human health and environmental safety, it is necessary to adopt responsible and safe practices to ensure safe operations. This includes continuous tailings monitoring, as it is a preventive risk management tool. Currently, some environmental problems are associated with tailings management in both Chile and Peru (Cacciuttolo, C. & Cano, D., 2022), especially related to the potential contamination of soil, water (surface/groundwater), and air from tailings
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