Christchurch Discussion Group


The Christchurch AusIMM discussion group invites you to a talk from Terry Widdowson on Thursday the 28th of June at 6.00pm in the Golder Associates Christchurch office. The talk is titled “Remediation of arsenic and zinc at the former Alexander Gold Mine near Reefton”.

Terry will present on the remediation of arsenic and zinc contaminated tailings at the former Alexander Gold Mine Processing Complex near Reefton. Arsenic concentrations reached 35 wt % in a ‘Roaster’ and 10 wt % in tailings stockpiles. The primary objective was to make the site safe for human access while retaining heritage structures, this was achieved by burying the contaminated soil and tailings in an on-site engineered containment cell. The main challenge for the project was the remote location and the logistics of getting equipment and people in and out of the site during the remediation works.

Terry Widdowson has over 25 years’ experience as a hydrogeologist and geoscientist, gained in the UK and NZ. He has worked in both the private (environmental consultants) and public sector (environmental regulators). With a degree in Earth Science, Terry spent his early post graduate years working for a deep drilling contractor involved in the geological investigations for an underground nuclear waste repository in the UK; since then he has worked in the contaminated land sector. Terry has lived in NZ for the past 10 years and he has been fortunate to work on the consenting for some of the country’s largest infrastructure projects (Waterview Connection, Victoria Park Tunnel, City Rail Link (Auckland); Southern Motorway (Christchurch). He has also worked on some really interesting remediation projects, Alexander Gold Mine being one of them.


Date: Thursday 28th June 2018
Time: 6:00pm
Venue: The Regent Meeting Room Level 1, 214 Durham St  Christchurch Central
Cost: Free for all to attend. Includes Drinks and finger food.
Registrations: Please RSVP your interest to attend to Henry Dillon by emailing

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