San cristóbal ii. Un caso de inventario, caracterización, evaluación de riesgos, priorización y rehabilitación de una presa minera en España  <span class="so-article-trans-title" dir="auto"> Translated title: San cristóbal ii. A case of inventory, characterization, risk assessment, prioritization and rehabilitation of a mining impoundment in Spain </span>

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Abstract

Resumen La presa de relaves conocida como San Cristóbal II fue incluida en el año 2012 en el reciente inventario de instalaciones abandonadas de residuos mineros realizado en España por el IGME. Para pertenecer al inventario, una instalación de residuos mineros ha de haber alcanzado un mínimo de nivel de riesgo según una metodología preliminar de evaluación de riesgos desarrollada expresamente. El establecimiento de prioridades de actuación llevó a esta presa minera a ocupar la primera posición del listado de prioridades. Durante el año 2018 se aplicaron diferentes actuaciones de remediación, con un presupuesto de ejecución material de 1.241.584 €. Este trabajo explica todo el proceso seguido y concluye que, cuando se plantean acciones de remediación, puede ser interesante realizar una nueva evaluación de riesgos más refinada, detallada y cuantitativa

Translated abstract

Abstract The tailings dam known as San Cristobal II was included in 2012 in the recent inventory of abandoned mining waste facilities carried out in Spain by the IGME. A mining waste facility must have met a minimal risk level to be included in the inventory, as determined by a preliminary risk assessment technique created particularly for this purpose. The establishment of priorities for action led this mining tailings dam to occupy the first position on the list of priorities. During 2018, different rehabilitation actions were implemented, with a material execution budget of €1,241,584. This work explains the whole process followed and concludes that, when considering remediation actions, it may be interesting to perform a new, more refined, detailed, and quantitative risk assessment.

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Most cited references 7

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Floods from tailings dam failures.

M Rico, G Benito, A Díez-Herrero (2008)

This paper compiles the available information on historic tailings dam failures with the purpose to establish simple correlations between tailings ponds geometric parameters (e.g., dam height, tailings volume) and the hydraulic characteristics of floods resulting from released tailings. Following the collapse of a mining waste dam, only a part of tailings and polluted water stored at the dam is released, and this outflow volume is difficult to estimate prior the incident. In this study, tailings' volume stored at the time of failure was shown to have a good correlation (r2=0.86) with the tailings outflow volume, and the volume of spilled tailings was correlated with its run-out distance (r2=0.57). An envelope curve was drawn encompassing the majority of data points indicating the potential maximum downstream distance affected by a tailings' spill. The application of the described regression equations for prediction purposes needs to be treated with caution and with support of on-site measurement and observations. However, they may provide a universal baseline approximation on tailing outflow characteristics (even if detailed dam information is unavailable), which is of a great importance for risk analysis purposes.