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Hana Christenson

Hana Christenson
Verum Group

Doctor of Philosophy

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20
Publications
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28
Citations

Publications

Publications (20)
Article
Processed tailings in the Mixed tailings impoundment at the Macraes gold mine built up a sedimentary pile up to 100 m thick between 1990 and 2013. The tailings consist of sand-dominated fluvio-lacustrine sediments with fine (cm scale) bedding and have a mineralogical stratigraphy that reflects changing mine processes. Most of the tailings (>90%) co...
Article
In much of the world, seasonal weather patterns cause a flush of dissolved contaminants from mined areas at the beginning of wet seasons. However, on parts of New Zealand’s west coast, the annual rainfall exceeds 6000 mm/year, with frequent rain days regardless of season; in these conditions, chemically rich flushes are short-lived and subsequently...
Article
Limestone leaching beds are used in passive treatment systems to remove Mn(II) from mine drainage. Removal typically involves a combination of biotic and abiotic mechanisms. Six laboratory scale reactors were set up to examine the relative importance of different removal mechanisms of Mn. Duplicate reactors contained limestone, limestone with pyrol...
Conference Paper
Full-text available
Wall wash samples were collected at man-made coal measures exposures between 3 days and 138 years old to understand to evolution of wall wash chemistry with time. Acidity in the wall wash solutions decreased rapidly from a maximum of >1000mg/l H2SO4 to <1mg/l H2SO4 as the age of the exposure increases. The composition of acidity also changes, at yo...
Article
Wall wash samples were collected from outcrops of Brunner Coal Measures aged between 3 days and 138 years in the Stockton, Denniston and Garvey Creek coalfields of the west coast of the South Island. The purpose of these wall wash samples is to measure differences in the amount of acid and trace elements released as the rocks weather to predict the...
Conference Paper
Full-text available
Mine drainage geochemistry at the Te Kuha deposit has been predicted using traditional acid base accounting, column leach testing and a theoretical approach based on geochemical processes that will operate in the waste rock dumps. The Te Kuha deposit is unusual because it contains both Paparoa and Brunner Coal measures and because Brunner Coal Meas...
Conference Paper
Full-text available
Limestone leaching beds can be utilised as passive treatment systems for oxidative removal of Mn(II) from mine drainage. Oxidation of Mn(II) by O2 is kinetically inhibited at circumneutral pH, however it can be catalysed by Mn oxidising microorganisms and by mineral surfaces, particularly those of Mn oxides. Although limestone treatment can be effe...
Article
Many studies have proposed that silicic acid and phosphate (PV) can displace arsenic sorbed to iron oxides leading to elevated As concentrations in aquatic systems. While surface complexation models are adept at quantifying sorption to synthetic oxides in laboratory systems their application to complex natural systems remains challenging. In this s...

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Projects

Project (1)
Project
We are currently investigating the speciation and mineral associations of arsenic in a tailings dam core. Aging of As bearing minerals that were in the ore, or that formed during processing may alter the mobility of As in the tailings. This project will utilise XRF, XRD, sequential extractions, and SEM techniques for solid phase assessments. Porewater chemistry will be analysed using spectrophotometric and ICP-MS techniques.