In 2005, the exploitation activities in the Moncalvo underground gypsum quarry in the Monferrato area (Moncalvo, Piedmont Region, NW Italy), intercepted a karst cave filled with pressurized water (0.3 MPa). After this event, a hydrodynamic and hydrogeochemical methodology was developed and coupled to direct observations to monitor the water flows into the quarry. In particular, all the existing water flows and the new ones generated by the mining activities were mapped. Redox potential, electrical conductivity and water temperature were recurrently measured and integrated with chemical analyses. Piezometric levels were also measured in many piezometers located around the quarry site. The proposed methodology was successfully applied to the Calliano gypsum quarry, which is located in the same geological framework but it is representative of a different karst system. The paper highlights the key role of the hydrogeochemical monitoring as a potential technique for the sinkhole risk related to mining activities.
Sinkholes and underground mining activities: the key role of monitoring for the hazard assessment and mitigation / Vigna, Bartolomeo; Fiorucci, Adriano; Vagnon, Federico; Barale, Marco. - ELETTRONICO. - (2023), pp. 1448-1453. (Intervento presentato al convegno 15th International ISRM Congress 2023 tenutosi a Salzburg, Austria nel 10-13 Ottobre 2023).
Sinkholes and underground mining activities: the key role of monitoring for the hazard assessment and mitigation
Bartolomeo Vigna;Adriano Fiorucci;Federico Vagnon;Marco Barale
2023
Abstract
In 2005, the exploitation activities in the Moncalvo underground gypsum quarry in the Monferrato area (Moncalvo, Piedmont Region, NW Italy), intercepted a karst cave filled with pressurized water (0.3 MPa). After this event, a hydrodynamic and hydrogeochemical methodology was developed and coupled to direct observations to monitor the water flows into the quarry. In particular, all the existing water flows and the new ones generated by the mining activities were mapped. Redox potential, electrical conductivity and water temperature were recurrently measured and integrated with chemical analyses. Piezometric levels were also measured in many piezometers located around the quarry site. The proposed methodology was successfully applied to the Calliano gypsum quarry, which is located in the same geological framework but it is representative of a different karst system. The paper highlights the key role of the hydrogeochemical monitoring as a potential technique for the sinkhole risk related to mining activities.File | Dimensione | Formato | |
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https://hdl.handle.net/11583/2987230