Isotopic imprints of mountaintop mining contaminants.

Journal Article

Mountaintop mining (MTM) is the primary procedure for surface coal exploration within the central Appalachian region of the eastern United States, and it is known to contaminate streams in local watersheds. In this study, we measured the chemical and isotopic compositions of water samples from MTM-impacted tributaries and streams in the Mud River watershed in West Virginia. We systematically document the isotopic compositions of three major constituents: sulfur isotopes in sulfate (δ(34)SSO4), carbon isotopes in dissolved inorganic carbon (δ(13)CDIC), and strontium isotopes ((87)Sr/(86)Sr). The data show that δ(34)SSO4, δ(13)CDIC, Sr/Ca, and (87)Sr/(86)Sr measured in saline- and selenium-rich MTM impacted tributaries are distinguishable from those of the surface water upstream of mining impacts. These tracers can therefore be used to delineate and quantify the impact of MTM in watersheds. High Sr/Ca and low (87)Sr/(86)Sr characterize tributaries that originated from active MTM areas, while tributaries from reclaimed MTM areas had low Sr/Ca and high (87)Sr/(86)Sr. Leaching experiments of rocks from the watershed show that pyrite oxidation and carbonate dissolution control the solute chemistry with distinct (87)Sr/(86)Sr ratios characterizing different rock sources. We propose that MTM operations that access the deeper Kanawha Formation generate residual mined rocks in valley fills from which effluents with distinctive (87)Sr/(86)Sr and Sr/Ca imprints affect the quality of the Appalachian watersheds.

Full Text

Duke Authors

Cited Authors

  • Vengosh, A; Lindberg, TT; Merola, BR; Ruhl, L; Warner, NR; White, A; Dwyer, GS; Di Giulio, RT

Published Date

  • September 3, 2013

Published In

Volume / Issue

  • 47 / 17

Start / End Page

  • 10041 - 10048

PubMed ID

  • 23909446

Electronic International Standard Serial Number (EISSN)

  • 1520-5851

Digital Object Identifier (DOI)

  • 10.1021/es4012959

Language

  • eng

Conference Location

  • United States