Department or Program



Before mining ceased, ore-processing residues were piled outside the Callery battery, a gold processing plant in East Otago, New Zealand. These residues were rich in arsenic and mercury. After mining ceased, the site was turned into a historic reserve. In 2005, Mains and Craw investigated the geochemistry of the residues. Unacceptably high concentrations of arsenic were found, prompting the Department of Conservation to clean up the site. This cleanup was successful in decreasing Hg concentrations, but only partially successful with As concentrations. Fe concentrations have drastically increased since 2005. Up to 87000 ppm of As was found, prompting the conclusion that the cleanup was only partially successful.

Level of Access

Open Access

First Advisor

Beverly Johnson

Date of Graduation


Degree Name

Bachelor of Science

Number of Pages


Components of Thesis

1 PDF document, 4 CSV documents, 1 GIS gdb

Open Access

Available to all.