The environmental and geomorphological impacts of historical gold mining in the Ohinemuri and Waihou river catchments, Coromandel, New Zealand
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F17%3A00481060" target="_blank" >RIV/67985831:_____/17:00481060 - isvavai.cz</a>
Nalezeny alternativní kódy
RIV/61388980:_____/17:00506313
Výsledek na webu
<a href="http://dx.doi.org/10.1016/j.geomorph.2017.06.011" target="_blank" >http://dx.doi.org/10.1016/j.geomorph.2017.06.011</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.geomorph.2017.06.011" target="_blank" >10.1016/j.geomorph.2017.06.011</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
The environmental and geomorphological impacts of historical gold mining in the Ohinemuri and Waihou river catchments, Coromandel, New Zealand
Popis výsledku v původním jazyce
Between 1875 and 1955 approximately 250,000 Mg yr− 1 of mercury-, arsenic-, and cyanide-contaminated mine tailings were discharged directly into the Ohinemuri River and its tributaries, in the Coromandel Region, North Island, New Zealand. A devastating flood on 14 January 1907 deposited large amounts of mine waste across the floodplain of the Ohinemuri and Waihou rivers in the vicinity of the township of Paeroa. The 1907 mine-waste flood deposit was located as a dirty yellow silt in cores and floodplain profiles, with a thickness ranging from 0.15–0.50 m. Geochemical analysis of the mine waste shows elevated concentrations of Pb (ca 200–570 mg kg− 1) and As (ca 30–80 mg kg− 1), compared to early Holocene background concentrations (Pb < 30 mg kg− 1, As < 17 mg kg− 1). Bulk sediment samples recovered from the river channel and overbank deposits also show elevated concentrations of Pb (ca 110 mg kg− 1), Zn (ca 140–320 mg kg− 1), Ag (ca 3 mg kg− 1), and Hg (ca 0.4 mg kg− 1). Using the mine-waste deposit as a chronological marker shows that sedimentation rates increased from ca 0.2 mm yr− 1 in the early Holocene, to 5.5–26.8 mm yr− 1 following the 1907 flood. Downstream trends in the thickness of the flood deposit show that local-scale geomorphic factors are a significant influence on the deposition of mine waste in such events. Storage of mine waste is greatest in the upstream reaches of the floodplain. The volume of mine waste estimated to be stored in the Ohinemuri floodplain is ca 1.13 M m3, an order of magnitude larger than recent well-publicised tailings-dam failures, such as the 1996 South America Porco, 2000 Romanian Baia Mare and Baia Borsa accidents, and constituted, and was recognised at the time, a significant geomorphological and environmental event. The mine-waste material remains in the floodplain today, representing a sizable legacy store of contaminant metals and metalloids that pose a long-term risk to the Ohinemuri and Waihou ecosystems.
Název v anglickém jazyce
The environmental and geomorphological impacts of historical gold mining in the Ohinemuri and Waihou river catchments, Coromandel, New Zealand
Popis výsledku anglicky
Between 1875 and 1955 approximately 250,000 Mg yr− 1 of mercury-, arsenic-, and cyanide-contaminated mine tailings were discharged directly into the Ohinemuri River and its tributaries, in the Coromandel Region, North Island, New Zealand. A devastating flood on 14 January 1907 deposited large amounts of mine waste across the floodplain of the Ohinemuri and Waihou rivers in the vicinity of the township of Paeroa. The 1907 mine-waste flood deposit was located as a dirty yellow silt in cores and floodplain profiles, with a thickness ranging from 0.15–0.50 m. Geochemical analysis of the mine waste shows elevated concentrations of Pb (ca 200–570 mg kg− 1) and As (ca 30–80 mg kg− 1), compared to early Holocene background concentrations (Pb < 30 mg kg− 1, As < 17 mg kg− 1). Bulk sediment samples recovered from the river channel and overbank deposits also show elevated concentrations of Pb (ca 110 mg kg− 1), Zn (ca 140–320 mg kg− 1), Ag (ca 3 mg kg− 1), and Hg (ca 0.4 mg kg− 1). Using the mine-waste deposit as a chronological marker shows that sedimentation rates increased from ca 0.2 mm yr− 1 in the early Holocene, to 5.5–26.8 mm yr− 1 following the 1907 flood. Downstream trends in the thickness of the flood deposit show that local-scale geomorphic factors are a significant influence on the deposition of mine waste in such events. Storage of mine waste is greatest in the upstream reaches of the floodplain. The volume of mine waste estimated to be stored in the Ohinemuri floodplain is ca 1.13 M m3, an order of magnitude larger than recent well-publicised tailings-dam failures, such as the 1996 South America Porco, 2000 Romanian Baia Mare and Baia Borsa accidents, and constituted, and was recognised at the time, a significant geomorphological and environmental event. The mine-waste material remains in the floodplain today, representing a sizable legacy store of contaminant metals and metalloids that pose a long-term risk to the Ohinemuri and Waihou ecosystems.
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
10511 - Environmental sciences (social aspects to be 5.7)
Návaznosti výsledku
Projekt
—
Návaznosti
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Ostatní
Rok uplatnění
2017
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Geomorphology
ISSN
0169-555X
e-ISSN
—
Svazek periodika
295
Číslo periodika v rámci svazku
OCT 15 2017
Stát vydavatele periodika
NL - Nizozemsko
Počet stran výsledku
17
Strana od-do
159-175
Kód UT WoS článku
000413175000013
EID výsledku v databázi Scopus
2-s2.0-85030484987