The Centralia mine fire, which has been burning underground since 1962, is one of the most prominent long-term coal blazes in the Keystone State. The town of Centralia, Pennsylvania, was once the center of the world's largest anthracite deposits, a highly valuable type of coal that burns hotter, longer, and cleaner than other types of coal found in the northeastern part of the state. Despite a population decline in the early 1960s, Centralia's population dwindled until the 1990s when other forms of energy, including petroleum and natural gas, took over coal's dominance. Despite repeated efforts to stop the fire, it has continued to burn underground for another 250 years. The cost of the fire has now reached $663 million, roughly $2 billion, and as of 2013, the state is allowing only seven residents to remain and their property will become state property under eminent eminent domain.