Titlebar

Export bibliographic data
Literature by the same author
plus on the publication server
plus at Google Scholar

 

Contributions of discharges from a historic antimony mine to metalloid content of river waters, Marlborough, New Zealand

Title data

Wilson, Nathaniel ; Craw, Dave ; Hunter, Keith A.:
Contributions of discharges from a historic antimony mine to metalloid content of river waters, Marlborough, New Zealand.
In: Journal of Geochemical Exploration. Vol. 84 (2004) Issue 3 . - pp. 127-139.
ISSN 0375-6742
DOI: https://doi.org/10.1016/j.gexplo.2004.06.011

Abstract in another language

Historic antimony mining at Endeavour Inlet, New Zealand, was developed in a stibnite-rich mesothermal vein system hosted in a km scale shear zone in metasedimentary schist. The schist contains calcite, and all waters have pH between 7 and 8. Underground tunnels (adits) have largely collapsed, but two adits provided access to waters which have interacted chemically with mineralised rock. Natural groundwater entering an adit at the top of the mineralised catchment had 190 μg/l Sb and 10 μg/l As. The amount of arsenic increased along the adit as the water interacted with arsenopyrite-bearing rocks and debris (up to 2000 mg/kg As, 500 mg/kg Sb) on the adit floor. Sb(III) was below 14 μg/l, and there was no detectable As(III). Antimony content remained near constant in the adit but increased outside the adit because of interaction with stibnite-rich debris. Negligible attenuation of metalloids occurred via adsorption outside the adit, as iron oxyhydroxide is rare. Metalloid attenuation was by dilution in a nearby natural stream, which carried <30 μg/s Sb and <10 μg/s As away from the site. An adit 500 m downstream was developed in a lower, more arsenopyrite-rich portion of the mineralised system with debris containing up to 15,000 mg/kg As and 5000 mg/kg Sb. Water from this adit had up to 200 μg/l Sb and 1650 μg/l As. Arsenic was attenuated by adsorption outside this adit, and by dilution by the natural stream. Antimony was not attenuated by adsorption, nor by dilution as the natural stream contained up to 200 μg/l Sb. Metalloid flux away from this site was ca. 200 μg/s Sb and 40 μg/s As, and the adit contributed negligible amounts of metalloids to this flux. Total metalloid flux from the catchment is 14,000 μg/s antimony and 5000 μg/s arsenic, which is around three orders of magnitude greater than observed mine inputs to the catchment. Highest flux occurred in September as water tables rose in the winter. Nearly all the metalloid flux is derived by natural groundwater and surface water interaction with mineralised rock. This interaction between water and mineralised rock is enhanced in this area because the catchment runs subparallel to the shear zone which controls the mineralised veins.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER88568
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Environmental Geochemistry Group
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 22 Oct 2015 07:29
Last Modified: 08 Mar 2016 06:33
URI: https://eref.uni-bayreuth.de/id/eprint/20639