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Analysis reveals a spontaneous flow incident causing a collapse cone in Coștiui, suggesting safety measures are necessary.
On July 21 st 2025, a flow of rocks mixed with water took place in Coștiui (Maramureș), from the surface, in the underground excavations of Ferdinand mine (which operated between 1828-1934), at the limit of its southern shaft, which generated on the surface, in the southern vicinity of the county road DJ 186A, a collapse cone of approx. 1500m 3 . The article develops the geo-mechanical phenomenon and the causes that led to the occurrence of this spontaneous phenomenon, the rehabilitation measures and the safety of the affected area.
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Onica et al. (2026) studied this question.
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