Southeast Missouri / Lead Belt / Mississippi Corridor
Mine tailings (chat): what those big light-colored piles are
The pale tailings hills around the old Lead Belt are a defining feature of the local landscape, and understanding what they are helps residents and visitors read the area accurately.
Drive around Park Hills and the former Flat River district and you will see large, pale hills of crushed rock left over from lead mining and milling — locally called chat or tailings. They are not natural hills; they are mine waste from processing lead ore, and they are one of the most recognizable features of the Old Lead Belt. Some of this ground is now part of St. Joe State Park, where designated areas are open for off-road riding on the sand-like tailings. Outside park boundaries, tailings can be subject to environmental oversight and cleanup, so they are not an open invitation to dig or ride. Missouri State Parks describes the recreation areas, while the Missouri Geological Survey within DNR is the right source for the geology and mining-landform context. Treat the piles as a managed landscape, not a free-for-all.
References
More from St. Francois County: browse every local note for the county.
Last checked against the sources above: June 15, 2026.