There are 215,430 acres or 337 square miles of abandoned coal mines in Pennsylvania.

92,231 acres are dry strip mine, 6,710 acres are strip mine filled with water. 86,317 acres are coal mining refuse, 722 acres of it is currently burning. Underground coal  fires burn on an additional 2,609 acres.

Data Source: Abandoned Mine Land Inventory Polygons, 2019 – Pennsylvania Department of Environmental Protection. http://www.pasda.psu.edu/uci/DataSummary.aspx?dataset=459