At 10 a.m. on February 10, 2011, disaster struck the Çöllolar coalfield in central Turkey, near the city of Elbistan. The northeastern wall of an open-pit mine collapsed, sending about 50 million tons of material into the mine. The debris buried and killed ten workers.
The collapse was the second at the same mine within a week. Four days earlier, a smaller landslide damaged the opposite wall and killed one person. According to a United Nations report, debris from the two landslides covered 2.73 square kilometers (1 square mile). The larger landslide extended 350 meters (1,150 feet) past the original perimeter of the pit. Inadequate drainage of the mine walls likely caused the landslides, according to Caner Zanbak, an environmental adviser to the Turkish Chemical Manufacturers Association.
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Earth Observatory, June 2012