Franklin Found mine map
One interactive Sangamon County coal mine map built from ISGS mapped mine layers, county mine directories, and available mine-note source cards. Use the map filters to switch towns, zones, layers, and historic aerials.
Combined map
Sangamon County
All currently mapped Sangamon County and nearby ISGS mine footprints and shaft points in one view, with town radius search, zone filters, source cards, save/share image export, and street, topo, satellite, and historic aerial basemaps.
Quick town filters
Mine features are approximate and intended for historical reference. On the combined Sangamon map, choose a town to show only footprints and shafts within that town's selected radius. Use the Layers panel to separate confirmed footprints, known shafts, uncertain points, and modern active mines where present.