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Identifying preferential acid mine drainage flow paths in the shallow subsurface using 3D electrical resistivity tomography
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|Authors:||Bridge, Cas; Bizzell, Karson; Ramachandran, Kumar|
|Author Affiliations:||Primary: |
University of Tulsa, Tulsa, OK, United States
|Volume Title:||Society of Exploration Geophysicists international exposition and Eighty-fifth annual meeting; technical program expanded abstracts|
|Source:||SEG Technical Program Expanded Abstracts, Vol.34, p.5021-5025; Society of Exploration Geophysicists international exposition and Eighty-fifth annual meeting, New Orleans, LA, Oct. 18-23, 2015, edited by Anonymous. Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States. ISSN: 1949-4645|
|Summary:||The Catholic 40 is a reclaimed mining site located within the Tar Creek Superfund Site (TCSS) of Ottawa County, Oklahoma. Mining for lead and zinc ores took place in the early 20th century within the Mississippian-aged Boone Group, which consists of fractured limestone and interbedded chert. Large quantities of mining wastes and fine tailings were generated and disposed of on-site. Remediation efforts began in 2013 with the removal of surficial wastes (107,000 tons) and plugging of three mine shafts. Groundwater conditions at the site have not been assessed. Water sampled from mine shafts in other locations within the TCSS has been shown to have concentrations of cadmium as high as 590 µg/L, lead as high as 282 µg/L, and zinc as high as 560,000 µg/L as a result of weathering of sulfide minerals present in mine voids. Water contained in the underground mine workings is in direct contact with the groundwater in the surrounding rocks of the Boone Group and thus provides a source of direct contamination to the Boone aquifer. The objective of this study was to identify zones of low resistivity in the shallow subsurface at the Catholic 40 site in order to determine if mining-related contamination was migrating via preferential groundwater flow pathways. Electrical resistivity surveys are commonly applied to acid mine drainage studies because the products of acid mine drainage (SO42-, H+, metal ions) cause affected waters to be highly conductive to electrical current. 3D inversion results indicated a linear, low conductivity anomaly with an azimuthal orientation of 120° that extended vertically through the entire inverted volume. This zone of low conductivity was interpreted to be an open fracture through which potentially contaminated groundwater was moving.|
|Subjects:||Acid mine drainage; Cadmium; Carbonate rocks; Carboniferous; Chemically precipitated rocks; Chert; Electrical methods; Geophysical methods; Ground water; Heavy metals; Hydrochemistry; Lead; Limestone; Metals; Mississippian; Paleozoic; Pollutants; Pollution; Remediation; Resistivity; Sampling; Sedimentary rocks; Superfund sites; Three-dimensional models; Tomography; Zinc; Oklahoma; Ottawa County Oklahoma; United States; Boone Group; Tar Creek Superfund Site|
|Coordinates:||N364200 N370000 W0943800 W0950000|
|Copyright Information:||GeoRef, Copyright 2021 American Geosciences Institute. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States|
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