Superfund Site Profile
The Madison County Mines Site includes all of Madison County and the “Mine LaMotte Tract” in southern St. Francois County, Missouri. Mining operations beginning in the early 1700s and ending in the mid-1900s resulted in 13 major tailings and chat deposit areas from mineral processing operations. Erosion of the tailings resulted primarily in heavy metals contamination—primarily lead—of soils, sediments, surface water and groundwater. Contaminated soil, tailings and chat was transported to residential properties for use in foundation bases, driveway aggregate, and for use as fill and topsoil. Seven Operable Units (OUs) are designated for the site:
OU 1 – Northern Madison County Unit is located in northern Madison County and consists of the Mine La Motte Recreation Association (MLMRA) Subsite that contains approximately 250 acres of tailings; Slime Pond, a 100-acre lake used by the MLMRA; the Harmony Lake and Harmony Lake tailings (capped); Basler Mines, also referred to as Copper Mines Tailings/Shoemaker Property (removed); the Old Jack Mine; the Lindsey Mine; the Offset Mine; City of Fredericktown Lake; the small gage feeder rail right-of-way to the abandoned Black Mountain spur and abandoned Missouri Pacific right-of-way. All associated outflow locations are also included.
OU 2 - Anschutz Subsite consists of all mining and mine works locations and adjoining areas located immediately southeast of Fredericktown. Included are the A, B, C, D and E tailings areas (historically known as the Madison Mine, all but D tailings area capped by potentially responsible party); a metallurgical pond and sediment pond; remnants of an old mill and smelter and associated slag pile; head frame and abandoned shafts; a mine decline; a refinery complex; a remnant chat pile and mine dump; associated groundwater; surface water and sediments in Goose Creek and Tollar Branch Creek; the abandoned Black Mountain spur right-of-way through Fredericktown, and all other mine works locations and outflows affected by these past mining activities.
OU 3 – Residential Properties includes residential yards, public areas, child high-use areas, roadways, right-of-ways, storm water drainages and potable groundwater at private wells in halos of mine waste, mine workings and outfalls. Details of the response actions and progress is stated in the Site History and Enforcement Activities Sections.
OU 4 - Conrad Tailings includes a tailings pile and adjoining Ruth mine and mill complex with its mine waste, surface water and sediments affected by the mine waste, eroded materials in the unnamed tributary to Mill Creek with its floodplain and overbank deposits; adjacent road right-of-ways and drainages, mine waste pile wind-blown contamination; groundwater impacts within the mine waste locations; and all other associated mine works locations and outflows. A focused Feasibility Study (FS) and Record of Decision (ROD) were completed in 2011, and a Remedial Design (RD) under development by the Missouri Department of Natural Resources (MDNR) is scheduled for completion by the end of October 2014.
OU 5 - Catherine Mines/Skaggs Tailings includes the Catherine Mine with its mine waste, pond, repository, Logtown Branch Creek and associated drainages. The Skaggs tailings location includes its mine waste and associated drainages with surface water, sediment, overbank and floodplain deposits along two unnamed tributaries. Also included is the transect of a former overhead tram which transported parent rock from the Skaggs subsite to the Little St. Francis River (LSFR) Subsite for processing; the LSFR Subsite; and all other associated mine works locations and outflows. A focused FS and ROD were completed in 2012, and the RD is scheduled for completion by end of September 2014.
OU 6 - Silver Mines includes all other known and undiscovered mining-related contaminated areas including but not limited to the Silver Mines area with the Einstein and Apex mines; Hickory Nut tailings locations 1, 2 and 3 (3 has been removed), nearby groundwater, surface waters and sediments in the unnamed runoffs to the Little St. Francis River; road right-of-way; public drainage ways; and mine works locations and outflows. A portion of this OU is located on U.S. Forest Service property.
OU7 – Little Saint Francis River (LSFR) Watershed includes all surface water, floodplain soil, overbank deposits, and sediments in the Fredericktown City Lake and streams in the LSFR watershed that are not specifically addressed under other OUs or where there is PRP involvement. Although some tailings and chat piles have been removed or capped, many remain in need of a remedy determination and remediation. Cleanup operations for residential properties remains in progress along with maintenance and monitoring activities.