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Mine Water and the Environment

, Volume 34, Issue 4, pp 417–429 | Cite as

Metalloid Attenuation from Runoff Waters at an Historic Orogenic Gold Mine, New Zealand

  • J. DruzbickaEmail author
  • D. Craw
Technical Article

Abstract

The metalloids arsenic and antimony are mobilised through the decomposition of arsenopyrite, pyrite, and stibnite at the historic Big River Mine. Their content in the solid substrates reach levels up to ≈25 wt% As and 3.6 wt% Sb, but their concentrations in the mine water are only elevated locally, up to 0.85 mg/L dissolved As and 0.007 mg/L dissolved Sb. Water draining the waste rock are characterised by neutral pH, but at the mine’s former processing site, the oxidation of sulphide concentrates has produced acidic conditions, both in the water (pH 3.8) and solid mining residues (paste pH 2–4). Dissolved metalloid concentrations are being effectively attenuated on site through the formation of secondary As phases in the mining residues, including scorodite, iron sulphoarsenate, and amorphous iron arsenate. Attenuation is also occurring by co-precipitation and adsorption onto iron oxides or hydroxides, and adsorption onto clay mineral surfaces. These processes are complemented by dilution of the dissolved As and Sb by the Big River. Therefore, despite the extremely high levels of As and Sb in the mining residues, metalloid mobilisation is limited, resulting in relatively low concentrations in water leaving the site.

Keywords

Gold mining Arsenic Antimony Metalloid mobility Mining residues 

Metalloid-Rückhaltung aus dem Abwasser eines ehemaligen Goldabbaus in einer orogen gebildeten Lagerstätte in Neuseeland

Zusammenfassung

Die Metalloide Arsen und Antimon werden als Abbauprodukt bei der Umsetzung von Arsenopyrit, Pyrit und Stibnit aus der Big River Mine freigesetzt. Es sind Feststoffgehalte bis zu 25 Gew-% As und 3.6 Gew-% Sb in den Bergwerksabfälle bekannt. Im Abwasser des Standorts werden jedoch nur lokal erhöhte Werte von bis zu 0.85 mg/L gelöstes As und 0.007 mg/L gelöstes Sb gemessen. Die Haldenabwässer haben neutrale pH-Werte. Am früheren Aufbereitungsstandort des Bergwerks existieren jedoch sowohl im Wasser (pH 3.8) als auch in den festen Rückständen (Feststoff pH 2–4) saure Bedingungen, was auf die Oxidation von Sulfiden zurückgeführt wird. Die gelösten Metalloide werden auf dem Gelände durch die Bildung von sekundären Arsen-Phasen (Skorodit, Eisen-Sulfoarsenat, amorphe Eisenarsenate) in den Bergwerksrückständen wirksam zurückgehalten. Die Rückhaltung geschieht zudem durch Mitfällungs- bzw. Sorptionsprozesse an Eisenoxiden und –hydroxiden sowie durch die Sorption an Tonmineralen. Zusätzlich wirken bei gelöstem As und Sb auch Verdünnungprozesse im Abfluss des Big River. Aus diesem Grund ist eine Freisetzung trotz der extrem hohen As- und Sb-Gehalte in den Bergwerksabfällen begrenzt und führt nur zu relativ geringen Gehalten im Abwasser des Bergwerksstandortes.

Atenuación de metaloides en las aguas que escurren de una histórica mina de oro orogénico en Nueva Zelanda

Resumen

Los metaloides arsénico y antimonio son movilizados a través de la descomposición de arsenopirita, pirta y estibnita en la histórica mina Big River. Los contenidos en los sustratos sólidos alcanzan niveles de hasta ≈25 % p/p As y 3,6 % p/p Sb, pero sus concentraciones en el agua de mina son sólo localmente elevadas (hasta 0,85 mg/L de As y 0,007 mg/L de Sb disuelto). El agua que drena a través de los residuos está caracterizada por pH neutro pero en el sitio de procesamiento original de la mina, la oxidación de concentrados de sulfuros ha producido condiciones ácidas tanto en el agua (pH 3,8) como en los residuos sólidos (pH 2–4). Las concentraciones de los metaloides disueltos están siendo efectivamente atenuados en el sitio a través de la formación de fases secundarias de As en los residuos mineros incluyendo escorodita, sulfoarsenato de hierro y arseniato de hierro amorfo. La atenuación también ocurre por co-precipitación y adsorción sobre óxidos e hidróxidos de hierro y adsorción sobre las superficies de los minerales arcillosos. Estos procesos son complementados por la dilución del As y Sb disueltos que provoca el río Big River. Así, independientemente de los altos valores de As y Sb en los residuos mineros, la movilización de los metaloides es limitada, resultando en relativamente bajas concentraciones en el agua que deja el sitio.

新西兰废弃的造山带金矿排放废水中类金属的衰减

摘要

大河矿(Big River Mine)的毒砂、黄铁矿和辉锑矿的分解使类金属砷和锑活化。虽然采场固体废物底质中的砷和锑含量分别达到25 wt%和 3.6 wt%,但它们在矿井废水中的浓度仅局部升高,溶解态砷和锑的浓度分别为0.85 mg/L和0.007 mg/L。矿井废水的pH值中等,但是冶炼场浓缩硫化物的氧化使水环境酸化,水pH值3.8,固体废弃物paste pH为2-4。溶解类金属的浓度由于采矿固体废物生成次生砷化物(如臭葱石、硫砷酸铁和非晶质砷酸铁)而明显衰减;同时,共同沉淀作用、铁氧化物和氢氧化物的吸附作用和泥岩的表面吸附作用也都使溶解类金属浓度衰减。大河矿(Big River)进行一步稀释了溶解态砷和锑。因此,即使采矿废弃矿石含有丰富的砷和锑,但其类金属化合物活性有限,排放废水中浓度较低。

Notes

Acknowledgments

This study was funded by the NZ Ministry of Business, Innovation, and Employment and the University of Otago. The Department of Conservation kindly permitted sampling at the historic site. We are grateful to Dave Hodson for his assistance in the field and to OceanaGold Ltd for logistical support. Technical assistance from Kat Lilly and Damian Walls is appreciated. Helpful reviews by two anonymous referees and Dr. R. Kleinmann improved the manuscript.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Geology DepartmentUniversity of OtagoDunedinNew Zealand

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