Groningen Province Challenges Extension of Salt Extraction at Heiligerlee
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The province of Groningen is formally contesting a recent decision allowing Nobian, a salt and chemicals producer, to continue extracting salt near the village of Heiligerlee for another decade. This legal challenge underscores growing concerns about subsidence and potential environmental risks associated with decades of salt mining in the region.
The dispute centers around a plan approved in April by outgoing Minister of Climate and Green Growth Sophie Hermans to permit extraction through 2035. While the minister’s approval came with conditions – including further research into safe cavern closure and a mandated closure plan within five years – provincial officials argue these measures are insufficient to address the inherent dangers.
Decades of Extraction and Rising Concerns
Salt has been extracted near Heiligerlee since 1957, and the practice has long been a source of anxiety for local residents. The State Supervision of Mines (SodM), the Dutch regulatory body overseeing mining operations, previously advised against extending the extraction permit, deeming it “irresponsible” to continue operations at these caverns. While the SodM currently considers the situation “manageable and safe,” it has repeatedly expressed concerns about long-term subsidence and the possibility of leaks, potentially manifesting as cracks or sinkholes.
“The regulator finds the current situation manageable and safe, but is concerned about subsidence and possible leaks in the long term,” a senior official stated. Nobian has been under increased scrutiny from the SodM for years as a result.
Conflicting Assessments of Cavern Safety
Nobian, along with the Mining Council and research institute TNO, maintains that the salt caverns can be safely closed using a “hard closure” method outlined in the extraction plan. The company asserts that salt mining has not contributed to earthquake damage in the past and is committed to monitoring ground vibrations for thirty years following the cessation of extraction. Residents experiencing damage can file claims with the Groningen Mining Damage Institute.
However, the province’s appeal also extends to a similar extension granted in October for Nobian’s salt extraction operations at Zuidwending, also in East Groningen. The core of the province’s objection lies in the uncertainty surrounding the risks associated with “hard closure” – a process that remains largely untested at this scale.
According to the minister, the province’s “legitimate” concerns about safe closure have been taken into account.
A Broader Regional Strategy
The government recently signed a declaration of intent with the region earlier this month, hailed by Minister Hermans as “an important milestone towards a future vision for the area.” This agreement coincides with the launch of the Netherlands Salt Research Program, which will prioritize research into effective cavern closure techniques.
“Closing caverns will have a strong place in this,” Hermans stated.
The province of Groningen is expected to formally submit its arguments to the Council of State next month, setting the stage for a critical legal battle that could reshape the future of salt extraction in the region and determine the long-term safety and stability of the land.
