The collapse is thought to have been the result of subsidence caused by poor weather conditions.
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The Saarland workings are in sandstone, which crumbles and cracks, causing frequent tremors and subsidence.
Through time, you'll see these episodes of subsidence, and it doesn't appear to be decreasing through time.
Wigan is famous for its Flashes - flooded areas of mining subsidence which are home to wetland species.
Virginia Burkett is the scientist at the U.S. Geological Survey who has analyzed the ground-based measurement of subsidence.
The average settling, or subsidence, was about the same as it was measured on land - about six millimeters a year.
Other aspects of climate change and land subsidence significantly exacerbate this effect though the relative importance of these factors varies from location.
China's rising sea levels hit a record high in 2012 due to global warming and land subsidence, threatening millions of coastal residents, reports China Daily.
About half of the route is across permafrost, which poses particular challenges because of the danger of subsidence caused by melting at the surface in summer.
Professor TIMOTHY DIXON (Director, Geodesy Lab, University of Miami): What we found was that some of the levees that failed in Katrina had extremely high rates of subsidence.
The city, which attracts millions of tourists every year, is seeing sea-level rises of around 2 mm per year, together with slow, mostly natural, subsidence of about another 2 mm every year.
Dr. VIRGINIA BURKETT (Chief, Forest Ecology Branch, National Wetlands Research Center, U.S. Geological Survey): For example, where we have artificial fill, the subsidence rates are much more rapid than they are on the natural levee deposits.
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