Presenter:  Graeme Quickfall, Hiway Environmental Ltd, Ghassan Basheer, Waikato Regional Council

Presentation title:  Tui Mine tailings remediation project – geotechnical and construction challenges

Tui Mine tailings remediation project – Geotechnical and Construction Challenges – project case study of the recently completed remediation of NZ’s largest contaminated remediation project.

This paper will provide a case study describing the Tui Mine remediation project located on the flanks of the Kaimai ranges behind Te Aroha township in the Waikato. The Tui mine was abandoned in the 1970’s, leaving behind a tailings dam containing some 100,000 m3 of contaminated tailings.   The tailing dam was both seismically unstable and producing Acid Rock Drainage resulting from acid leaching of heavy metals into the local receiving environment.      The design objectives were therefore to improve geotechnical stability and improve the geochemistry of the impounded tailings. This was achieved using a combination of Insitu mass stabilising and ex situ stabilising to rework the tailings into an earthfill with a stable landform profile that does not retain water.       The stage 2 Tui Mine Remediation Project was carried out between September 2011 and April 2013. This was the largest project ever funded by the Ministry for the Environment and the largest insitu stabilising project in New Zealand’s history.    The project represents an excellent example of cooperation between the Principal, Designer, Project Manager, Contractor and stakeholders to successfully deliver a very challenging project

Event: WasteMINZ Conference 2013

Date: Thursday 24 October 2013