Mataura River rips past the former Mataura paper mill. Photo: Otago Daily Times
The Environmental Defence Society (EDS) is filing Declaration Proceedings in the Environment Court today (Monday)
concerning the storage of ouvea premix at sites on Kana Street, Mataura, Southland. The Mataura sites were nearly
inundated with floodwaters in February sparking a civil defence emergency.
New Zealand Aluminium Smelters Limited’s (NZAS) aluminium processing produces a by-product called dross. Dross can be
subjected to an aluminium recovery and recycling process. One of the outputs of that process is ouvea premix. It has
potential use in fertiliser manufacturing and steel production.
“We are concerned that if the stored ouvea premix gets wet, it produces ammonia gas which is toxic to humans. It can
also harm aquatic life. There are residences nearby as well as a Te Kohanga Reo child care centre,” said EDS CEO Gary
“It’s our contention that NZAS is responsible for the material and should be taking immediate steps to remove it
promptly to a safe site.
“NZAS is owned by Rio Tinto (80%) and Sumitomo Chemical Company (20%). Rio Tinto does not have a good environmental
track-record offshore, having recently destroyed a 45,000-year old Aboriginal cultural site in the Pilbara region in
Western Australia. We wish to see a more responsible approach from NZAS to avoid adverse environmental impacts in this
“The backstory to this matter is complex, with NZAS having contracted out processing and recycling of the ouvea premix
to a company that went into liquidation. Our Declaration Proceedings ask the Environment Court to rule on whether NZAS
can contract itself out of legal responsibilities to avoid, remedy or mitigate adverse effects (or potential adverse
effects) under the Resource Management Act.
“The EDS proceedings are supported by affidavits that track the history of the matter and provide expert evidence on
hydrology and chemistry. Our concern is that another flood event could inundate the warehouse storage facilities.
“If the ouvea premix gets wet, it could release ammonia gas at concentrations that could harm people. Whilst such an
event is a low probability, it could have serious consequences. The timeframe for removal of the material, which is
vague and uncertain, seems excessive given those risks.
“EDS is filing its proceedings in the Environment Court in Christchurch today. Barrister Rob Enright is acting.
Donations to support this case would be very welcome and can be made here ,” Mr Taylor concluded.
Environmental Defence Society
EDS is a not-for-profit environmental organisation committed to improving environmental outcomes within New Zealand.
The Environmental Defence Society (EDS) is a professionally run, independent environmental group that was established in
1971. It brings together the disciplines of science, planning, landscape and the law.
MORE ABOUT EDS
It operates as a think-tank, providing thought leadership on key environmental issues as well as representing the
environment before councils and the courts.
EDS is located at the collaborative and business aware end of the environmental movement, seeking constructive
engagement with all sectors, to achieve good environmental and economic outcomes for all New Zealanders. It has
It also plays an education role, helping business, councils, community groups and iwi to better understand best
practice resource management. EDS runs national and regional conferences and seminars on topical issues.
EDS is a registered charity and donations to it are tax-deductible.