U.S. EPA Contaminated Site Cleanup Information (CLU-IN)

U.S. Environmental Protection Agency
U.S. EPA Technology Innovation and Field Services Division

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U.S. EPA, Technology Innovation and Field Services Division, Washington, DC.
EPA 542-R-18-001, 10 pp, 2017

Working with state and federal regulatory agencies, a proactive responsible party is using an adaptive management approach to address environmental impacts from decades of kyanite mining at the Henry's Knob Superfund Alternative Approach site in York County, South Carolina. Open pit mining in a large pit quarry took place from 1947 to 1965 on top of the knob (mountain). Mined ore-grade rock was ground up, followed by a floatation process to liberate the kyanite from the other minerals in the ore. Leftover ground-up waste rock and spoils were dewatered in ponds, and the piles were left on site. Revegetation of the former mine tailings area is reducing tailings erosion and water infiltration, thus reducing the generation of acid mine drainage as a source of impact to groundwater and nearby streams. Ongoing monitoring will evaluate the effectiveness and other benefits associated with the revegetation. Based on the evaluation results, implementation of a groundwater remedy may or may not be necessary. The site's final cleanup plan is under development and will take at least two years to complete. https://semspub.epa.gov/work/HQ/100000929.pdf *** EPA sponsored a webinar on the Henry's Knob ecological revitalization on March 6, 2018, and the archived webinar materials—audio, video, and PowerPoint slides—are available at https://clu-in.org/conf/tio/mining-ecorev_030618/.

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