Studies of an opencast coalmine in western Germany suggest that the mining activity has caused significant ground sinking, or subsidence, in the surrounding area and has reactivated previously inactive geological faults. Researchers from the GFZ Helmholtz Centre for Geosciences in Potsdam analyzed satellite imagery and field data from the Rhenish coalfields, which are located between the cities of Aachen and Cologne. Their findings, published in the journal Engineering Geology, reveal that the large amounts of groundwater extracted to support mining operations have lowered the water table. This has led to widespread subsidence, with effects observed as far as 20 kilometers (12 miles) from the mine's edge. The areas most affected by subsidence were not randomly distributed. Instead, they clustered and intensified along existing geological faults, which were reactivated by the ground movement caused by mining. This reactivation has had visible impacts on the local infrastructure, with cracks appearing in buildings and roads. One notable example is a local school that has shifted by half a meter due to the ground movement. Although mining operations continue in the region, the researchers note that subsidence is likely to persist for decades. However, their study highlights the potential of combining satellite monitoring with geological data to create detailed subsidence hazard maps. These maps can help local communities prepare for future ground movements and design more resilient infrastructure to mitigate the risks associated with subsidence. The research underscores the long-term environmental and structural challenges posed by opencast coal mining. While such mining practices have been vital for energy production, they can also lead to significant geological changes that affect the stability of the surrounding land. The findings emphasize the importance of ongoing monitoring and proactive planning to manage these risks effectively.