Fingerprinting two metal contaminants in streams with Cu isotopes near the Dexing Mine, China

Shiming Song, Ryan Mathur, Joaquin Ruiz, Dandan Chen, Nicholas Allin, Kunyi Guo, Wenkai Kang

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Transition metal isotope signatures are becoming useful for fingerprinting sources in surface waters. This study explored the use of Cu isotope values to trace dissolved metal contaminants in stream water throughout a watershed affected by mining by-products of the Dexing Mine, the largest porphyry Cu operation in Asia. Cu isotope values of stream water were compared to potential mineral sources of Cu in the mining operation, and to proximity to the known Cu sources. The first mineral source, chalcopyrite, CuFeS2 has a 'tight' cluster of Cu isotope values (-0.15‰ to +1.65‰; +0.37 ± 0.6‰, 1σ, n = 10), and the second mineral source, pyrite (FeS2), has a much larger range of Cu isotope values (-4‰ to +11.9‰; 2.7 ± 4.3‰, 1σ, n = 16).Dissolved Cu isotope values of stream water indicated metal derived from either chalcopyrite or pyrite. Above known Cu mineralization, stream waters are approximately +1.5‰ greater than the average chalcopyrite and are interpreted as derived from weathering of chalcopyrite. In contrast, dissolved Cu isotope values in stream water emanating from tailings piles had Cu isotope values similar to or greater than pyrite (>+6‰, a common mineral in the tailings). These values are interpreted as sourced from the tailings, even in solutions that possess significantly lower concentrations of Cu (65Cu ranging between +2 to +5‰). These data point to the mineral pyrite in tailings as the mineral source for the elevated Cu isotope values. Therefore, Cu isotope values of waters emanating from a clearly contaminated drainage possess different Cu isotope values, permitting the discrimination of Cu derived from chalcopyrite and pyrite in solution. Data demonstrate the utility of Cu isotopic values in waters, minerals, and soils to fingerprint metallic contamination for environmental problems.

Original languageEnglish (US)
Pages (from-to)677-685
Number of pages9
JournalScience of the Total Environment
Volume544
DOIs
StatePublished - Feb 15 2016

Fingerprint

Isotopes
Metals
isotope
Impurities
pollutant
metal
Pyrites
Minerals
chalcopyrite
Tailings
pyrite
tailings
Water
mineral
water
Mineral Waters
transition element
Weathering
Watersheds
Surface waters

Keywords

  • Chalcopyrite
  • Cu contamination
  • Porphyry Cu deposit
  • Tailings

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Waste Management and Disposal
  • Environmental Engineering

Cite this

Fingerprinting two metal contaminants in streams with Cu isotopes near the Dexing Mine, China. / Song, Shiming; Mathur, Ryan; Ruiz, Joaquin; Chen, Dandan; Allin, Nicholas; Guo, Kunyi; Kang, Wenkai.

In: Science of the Total Environment, Vol. 544, 15.02.2016, p. 677-685.

Research output: Contribution to journalArticle

Song, Shiming ; Mathur, Ryan ; Ruiz, Joaquin ; Chen, Dandan ; Allin, Nicholas ; Guo, Kunyi ; Kang, Wenkai. / Fingerprinting two metal contaminants in streams with Cu isotopes near the Dexing Mine, China. In: Science of the Total Environment. 2016 ; Vol. 544. pp. 677-685.
@article{035819efff9041a1b8d3e3cf15c263b5,
title = "Fingerprinting two metal contaminants in streams with Cu isotopes near the Dexing Mine, China",
abstract = "Transition metal isotope signatures are becoming useful for fingerprinting sources in surface waters. This study explored the use of Cu isotope values to trace dissolved metal contaminants in stream water throughout a watershed affected by mining by-products of the Dexing Mine, the largest porphyry Cu operation in Asia. Cu isotope values of stream water were compared to potential mineral sources of Cu in the mining operation, and to proximity to the known Cu sources. The first mineral source, chalcopyrite, CuFeS2 has a 'tight' cluster of Cu isotope values (-0.15‰ to +1.65‰; +0.37 ± 0.6‰, 1σ, n = 10), and the second mineral source, pyrite (FeS2), has a much larger range of Cu isotope values (-4‰ to +11.9‰; 2.7 ± 4.3‰, 1σ, n = 16).Dissolved Cu isotope values of stream water indicated metal derived from either chalcopyrite or pyrite. Above known Cu mineralization, stream waters are approximately +1.5‰ greater than the average chalcopyrite and are interpreted as derived from weathering of chalcopyrite. In contrast, dissolved Cu isotope values in stream water emanating from tailings piles had Cu isotope values similar to or greater than pyrite (>+6‰, a common mineral in the tailings). These values are interpreted as sourced from the tailings, even in solutions that possess significantly lower concentrations of Cu (65Cu ranging between +2 to +5‰). These data point to the mineral pyrite in tailings as the mineral source for the elevated Cu isotope values. Therefore, Cu isotope values of waters emanating from a clearly contaminated drainage possess different Cu isotope values, permitting the discrimination of Cu derived from chalcopyrite and pyrite in solution. Data demonstrate the utility of Cu isotopic values in waters, minerals, and soils to fingerprint metallic contamination for environmental problems.",
keywords = "Chalcopyrite, Cu contamination, Porphyry Cu deposit, Tailings",
author = "Shiming Song and Ryan Mathur and Joaquin Ruiz and Dandan Chen and Nicholas Allin and Kunyi Guo and Wenkai Kang",
year = "2016",
month = "2",
day = "15",
doi = "10.1016/j.scitotenv.2015.11.101",
language = "English (US)",
volume = "544",
pages = "677--685",
journal = "Science of the Total Environment",
issn = "0048-9697",
publisher = "Elsevier",

}

TY - JOUR

T1 - Fingerprinting two metal contaminants in streams with Cu isotopes near the Dexing Mine, China

AU - Song, Shiming

AU - Mathur, Ryan

AU - Ruiz, Joaquin

AU - Chen, Dandan

AU - Allin, Nicholas

AU - Guo, Kunyi

AU - Kang, Wenkai

PY - 2016/2/15

Y1 - 2016/2/15

N2 - Transition metal isotope signatures are becoming useful for fingerprinting sources in surface waters. This study explored the use of Cu isotope values to trace dissolved metal contaminants in stream water throughout a watershed affected by mining by-products of the Dexing Mine, the largest porphyry Cu operation in Asia. Cu isotope values of stream water were compared to potential mineral sources of Cu in the mining operation, and to proximity to the known Cu sources. The first mineral source, chalcopyrite, CuFeS2 has a 'tight' cluster of Cu isotope values (-0.15‰ to +1.65‰; +0.37 ± 0.6‰, 1σ, n = 10), and the second mineral source, pyrite (FeS2), has a much larger range of Cu isotope values (-4‰ to +11.9‰; 2.7 ± 4.3‰, 1σ, n = 16).Dissolved Cu isotope values of stream water indicated metal derived from either chalcopyrite or pyrite. Above known Cu mineralization, stream waters are approximately +1.5‰ greater than the average chalcopyrite and are interpreted as derived from weathering of chalcopyrite. In contrast, dissolved Cu isotope values in stream water emanating from tailings piles had Cu isotope values similar to or greater than pyrite (>+6‰, a common mineral in the tailings). These values are interpreted as sourced from the tailings, even in solutions that possess significantly lower concentrations of Cu (65Cu ranging between +2 to +5‰). These data point to the mineral pyrite in tailings as the mineral source for the elevated Cu isotope values. Therefore, Cu isotope values of waters emanating from a clearly contaminated drainage possess different Cu isotope values, permitting the discrimination of Cu derived from chalcopyrite and pyrite in solution. Data demonstrate the utility of Cu isotopic values in waters, minerals, and soils to fingerprint metallic contamination for environmental problems.

AB - Transition metal isotope signatures are becoming useful for fingerprinting sources in surface waters. This study explored the use of Cu isotope values to trace dissolved metal contaminants in stream water throughout a watershed affected by mining by-products of the Dexing Mine, the largest porphyry Cu operation in Asia. Cu isotope values of stream water were compared to potential mineral sources of Cu in the mining operation, and to proximity to the known Cu sources. The first mineral source, chalcopyrite, CuFeS2 has a 'tight' cluster of Cu isotope values (-0.15‰ to +1.65‰; +0.37 ± 0.6‰, 1σ, n = 10), and the second mineral source, pyrite (FeS2), has a much larger range of Cu isotope values (-4‰ to +11.9‰; 2.7 ± 4.3‰, 1σ, n = 16).Dissolved Cu isotope values of stream water indicated metal derived from either chalcopyrite or pyrite. Above known Cu mineralization, stream waters are approximately +1.5‰ greater than the average chalcopyrite and are interpreted as derived from weathering of chalcopyrite. In contrast, dissolved Cu isotope values in stream water emanating from tailings piles had Cu isotope values similar to or greater than pyrite (>+6‰, a common mineral in the tailings). These values are interpreted as sourced from the tailings, even in solutions that possess significantly lower concentrations of Cu (65Cu ranging between +2 to +5‰). These data point to the mineral pyrite in tailings as the mineral source for the elevated Cu isotope values. Therefore, Cu isotope values of waters emanating from a clearly contaminated drainage possess different Cu isotope values, permitting the discrimination of Cu derived from chalcopyrite and pyrite in solution. Data demonstrate the utility of Cu isotopic values in waters, minerals, and soils to fingerprint metallic contamination for environmental problems.

KW - Chalcopyrite

KW - Cu contamination

KW - Porphyry Cu deposit

KW - Tailings

UR - http://www.scopus.com/inward/record.url?scp=84960355742&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84960355742&partnerID=8YFLogxK

U2 - 10.1016/j.scitotenv.2015.11.101

DO - 10.1016/j.scitotenv.2015.11.101

M3 - Article

C2 - 26674697

AN - SCOPUS:84960355742

VL - 544

SP - 677

EP - 685

JO - Science of the Total Environment

JF - Science of the Total Environment

SN - 0048-9697

ER -