The Los Frailes tailings dam (Aznalcóllar, Spain) was a tailings storage dam. The failure type has been categorized as a foundation sliding failure (or loss of bearing, which then initiated sliding). The weakest part of the foundation was comprised of blue marl (clay and approximately 25% carbonate – CaCO3).
The Los Frailes tailings dam failure (Aznalcóllar, Spain).
