Meridian and NZAS Sign Long Term Contracts

Release






M e r i d i a n E n e r g y L i m i t e d ( A R B N 1 5 1 8 0 0 3 9 6 ) A c o m p a n y i n c o r p o r a t e d i n N e w Z e a l a n d
287-2 9 3 D u r h a m S t r e e t N o r t h , C h r i s t c h u r c h 8 0 1 3

m e r i d i a n e n e r g y . c o . n z
Stock Exchange Listings NZX (MEL) ASX (MEZ)
Meridian and NZAS Sign Long Term Contracts

31 May 2024
Meridian Energy and New Zealand’s Aluminium Smelter (NZAS)
1
have signed a package of conditional
20-year contracts for part of the NZAS Tiwai Point aluminium smelter’s electricity needs. The package
includes a long-term fixed price contract for wholesale electricity price cover and a significant demand
response agreement.
Meridian Energy Chief Executive Neal Barclay says the agreement is an excellent result after many years
of hard work.
“This is a fantastic outcome for New Zealand and the Southland region. It’s further proof that large
industrial businesses can utilise New Zealand’s renewable energy advantage and create low carbon
sustainable products, high value jobs and export dollars for our country.”
“We are very pleased that the NZAS team have adopted a more flexible approach toward their
operations. The demand response element of this new agreement is groundbreaking, not only for this
country but globally. The level of flexible demand offered by NZAS will support the electricity system to
become even more renewable, while relying less on coal and gas when the hydro lakes are low.”
Mr Barclay says the contracts are also a good result for Meridian.
“This new package of contracts is commercially sustainable and delivers value for our shareholders, so
we are talking a real win-win here. The NZAS decision to extend the smelter life removes significant
uncertainty for the electricity sector, which also helps pave the way for new renewable energy to be
built.”
Meridian will now consider implications on future pipeline investment and dividend policy. An update
on the dividend policy can be expected at Meridian’s full year results briefing in late August.
Key terms of the long-term contracts include:
•
377 MW base load volume from 2025
•
pricing that begins 1 July 2024 with a 20-year term, up to and including 31 December 2044
•
four demand response options, ranging from 25 MW to 185 MW – an upper limit that roughly
equates to one of Huntly’s Rankine units. Three quarters of a called option will come off
Meridian’s contracted volume

1
NZAS is a joint venture between Rio Tinto (79.36%) and Sumitomo Chemical Company Limited (20.64%)

m e r i d i a n e n e r g y . c o . n z
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A maximum of approximately 800 GWh of demand response is available in any given year, with an
average of approximately 400 GWh per annum over the 20-year term of the contract. This will be
valuable during periods of low lake inflows, providing critical dry year cover to the electricity system.
The new arrangements will replace all the current arrangements between Meridian and NZAS, with the
current arrangements terminating when the new arrangements take effect.
The contracts are conditional on satisfaction of conditions precedent, which include regulatory approval
from the Electricity Authority. If approval is given, the contracts will take effect from the later of 1 July
2024 and the date Meridian confirms to NZAS that all conditions precedent are satisfied or waived. If
conditions precedent are not all satisfied or waived before 31 December 2024, the contracts will not
come into effect.
NZAS has provided Meridian with a letter setting out their commitment to environmental remediation
of the smelter site, including details of their work to date with key stakeholders. A copy of the
environmental remediation letter accompanies this release.
A copy of the long-term electricity contract, the demand response agreement and the other related
conditional contracts signed by Meridian and NZAS are available here. A summary of the key terms of
the long-term electricity contract and the demand response agreement accompanies this release.
ENDS
Neal Barclay
Chief Executive
Meridian Energy Limited

Investor & Media Briefing
Neal Barclay and Meridian CFO Mike Roan will host an investor and media call via Microsoft Teams at
11am NZST (9am AEST) today. This will include an opportunity to ask questions. Click here to register for
this call. Pre-registration is required to attend.
Please note:
• For the Q&A, guests will be required to raise their (virtual) hand if they wish to ask a question.
This will place you in the queue. When invited to ask your question, you will need to unmute
your microphone. There will be no chat available for written questions.
• When you join the meeting, your name will appear to all meeting participants.
• The call will be recorded and a replay posted to the investor presentations page of the Meridian
website. Meridian’s Privacy Policy applies.

Media Interviews
Mr Barclay also has limited availability for media interviews from 9.45am to 10.30am NZST. See media
contact below.

m e r i d i a n e n e r g y . c o . n z
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Background
•
On 23 October 2019, Meridian was advised by the New Zealand Aluminium Smelters Limited’s
(NZAS) major shareholder Rio Tinto, that it intended to initiate a strategic review of the Tiwai Point
Aluminium Smelter.
•
On 9 July 2020, Rio Tinto gave notice it was terminating the contract with Meridian relating to the
Tiwai Point Aluminium Smelter, with effect on and from 31 August 2021.
•
On 14 January 2021, Rio Tinto accepted new short term ‘staged exit’ contract terms offered by
Meridian, effective from that date through to 31 December 2024.
•
On 28 July 2022, Meridian noted NZAS’s statement that they had begun exploring potential
pathways for the smelter to remain operational after December 2024 and announced that it would
engage in contract negotiations with NZAS as part of the process.


For investor relations queries, please contact:
Owen Hackston
Investor Relations Manager
021 246 4772
For media queries, please contact:
Philip Clark
Head of Communications
027 838 5710

31 MAY 2024
NZAS Contract Announcement
New Zealand aluminium smelter, Tiwai Point, Southland

1
NZAS is a joint venture between Rio Tinto (79.36%) and Sumitomo Chemical Company Limited (20.64%)
§Meridian Energy and Rio Tinto have conditionally signed a package of long-term contracts
for part of the NZAS
1
Tiwai Point aluminium smelter’s electricity needs.
§The package includes a long-term fixed price contract for wholesale electricity price cover
(Base Contract) and a demand response agreement.
§The Base Contract includes the following elements:
§sustainable pricing that begins 1 July 2024,
§a 20-year term, up to and including 31 December 2044,
§377 MW base load volume from 2025.
§The demand response agreement gives Meridian four demand response options that
incentivise the smelter to reduce consumption, in blocks ranging from 25 MW to 185 MW.
2
Today’s announcement
31 MAY 2024NZAS CONTRACT ANNOUNCEMENT

§The contracts are subject to satisfaction of conditions precedent, including:
§NZAS agreeing terms with other parties, and
§Regulatory approval from the Electricity Authority.
§Effective Date is the later of 1 July 2024 or the satisfaction of conditions precedent. If the
contracts take effect, regardless of the Effective Date, the pricing is backdated to 1 July
2024.
§Conditions precedent must be satisfied before 31 December 2024, unless waived.
3
Today’s announcement
31 MAY 2024NZAS CONTRACT ANNOUNCEMENT

Meridian NZAS contracts – further detail
4
31 MAY 2024NZAS CONTRACT ANNOUNCEMENT
Base Contract for difference
§472MW from Effective Date to 31 December 2024.
§377MW from 1 January 2025.
§New pricing from 1 July 2024 with annual price escalation based on CPI from start of 2028,
conditional on LME Aluminium Prices in the previous year being higher than the year before
the previous year.
§Term of 20 years to 31 December 2044.However,NZAS may provide 2 years’ notice of
termination any time from 31 December 2032 onwards but must make an irrevocable
payment of $180M to Meridian when providing that notice.
§Aggregate of $235M (first 10 years of term) and $180M (remainder of term) in prudential
support toMeridian in parent company and bank guarantees.

Meridian NZAS contracts – further detail
5
31 MAY 2024NZAS CONTRACT ANNOUNCEMENT
Demand response contract
§Flexible demand response with four demand options exercisable by Meridian. An exercised
demand option reduces the volume of cover provided by Meridian under the Base Contract by
the demand option volume.
§The sizes of the four demand options are 138.75MW, 75MW, 37.5MW, 18.75MW.
§Exercise of a demand option will incentivise NZAS to reduce consumption by 185MW, 100MW,
50MW or 25MW (as applicable).
§Payment of half of the annual premium depends on NZAS's compliance with demand response
calls.
§Strike price payable based on actual reduction.
§Annual price escalation based on CPI from start of 2028, conditional on LME Aluminium Prices
in theprevious year being higher than the year before the previous year.
§Term of 20 years as per the Base Contract and terminates automatically on termination of Base
Contract.
§Maximum of approximately 800 GWh of demand response is available in any given year, with
an average of approximately 400 GWh per annum over the term.

Meridian NZAS contracts – further detail
6
31 MAY 2024NZAS CONTRACT ANNOUNCEMENT
Demand response contract – summary of demand options
Option
Equivalent
reduced
consumption
(MWh per
hour)
ExercisableReduction

from Meridian
demand response
agreement
(MWh per
hour)
Usual
Ramp-
Down
Notice
Period
DR Period
(equivalent
number of days)
Usual Ramp-
Down Period
(equivalent
numberof days)
Usual Ramp-Up
Notice Period
(equivalent
number ofdays)
Usual Ramp-Up
Period
(equivalent
number ofdays)
Maximum Calls
12518.75
3 Business
Days
Minimum 10 days,
maximum 150days
5 days3 days15 days
Unlimited, but the
Option cannotbe
exercised more than 4
times inany 12-month
period
250 37.5
3 Business
Days
Minimum 15days,
maximum145 days
10 days3 days30 days
Unlimited, but the
Option cannotbe
exercised more than 2
times inany 18-month
period
3100 75
3 Business
Days
Minimum 22days,
maximum137days
18 days5 days100 days
The Option cannot be
exercisedmore than 8
times over the Term
4185 138.75
5 Business
Days
Minimum 30
days,
maximum75 days
25 days5 days200 days
The Option cannot be
exercisedmore than 4
times over the Term
Stand down periods apply between the exercise of options.

572572
-50-50
472
377377
-138.75-138.75-138.75
-200
-100
0
100
200
300
400
500
600
20231H 20242H 2024
2025 → 20322033 → 2044
MW
Calendar Year
NZAS contracts
Current CfDCurrent demand responseBase ContractDemand response
Meridian NZAS contracts
7
31 MAY 2024NZAS CONTRACT ANNOUNCEMENT
earliest termination notice date, with
minimum 2 years’ termination notice period
off Base Contract
volume
2
Follows smelter load, with minimum volume of 540MW and maximum volume of 572MW.
3
If called, the current demand response reduction volume of up to 50MW comes off the volume of the Current CfD between Meridian and NZAS. Meridian and NZAS have separately
agreed an up to 20MW peak demand response agreement for winter 2024 (effective 3 June 2024).
4
If called, the demand responsereduction volume comesoff the volume of the Base Contractbetween Meridian and NZAS.
4
up to
up to
up to
off Base Contract
volume
off Base Contract
volume
up to -50MW off
Current CfD volume
up to -50MW off Current
CfD volume; -20MW if
peak product called -
effective 3 June 2024
subject to satisfaction of conditions precedent
3
2
↑
540
↑
540

Current arrangements
8
31 MAY 2024NZAS CONTRACT ANNOUNCEMENT
§The current arrangements between
Meridian and NZAS, including the electricity
agreement, 2023/2024 demand response
agreement and 2024 peak demand
response agreement will all terminate at
midnight on the day before the date the
new arrangements take effect.
§If the new arrangements do not come into
effect, the current arrangements will expire
at the end of 2024 at the latest (if they have
not otherwise expired or been terminated
earlier).

9
Closing comments
§This major milestone removes significant
uncertainty for the people of Southland.
§The smelter’s commitment to a long term
relationship with New Zealand will facilitate
the development of further renewable
energy options.
§The demand response agreement is
groundbreaking and will provide critical dry
year cover, further supporting
decarbonisation of New Zealand’s economy.
§We also confirm our investor day scheduled
for 24 and 25 June will proceed. You will
hear more about this in the next few days.
31 MAY 2024NZAS CONTRACT ANNOUNCEMENT

10
Disclaimer
The information in this presentation was prepared by Meridian
Energy with due care and attention. However, the information is
supplied in summary form and is therefore not necessarily complete.
In addition, neither the company nor any of its directors, employees,
shareholders nor any other person shall have liability whatsoever to
any person for any loss (including, without limitation, arising from
any fault or negligence) arising from this presentation or any
information supplied in connection with it.
This presentation may contain forward-looking statements and
projections. These reflect Meridian’s current expectations, based on
what it thinks are reasonable assumptions. Meridian gives no
warranty or representation as to its future financial performance or
any future matter. Except as required by law or NZX or ASX listing
rules, Meridian is not obliged to update this presentation after its
release, even if things change materially.
This presentation does not constitute financial advice. Further, this
presentation is not and should not be construed as an offer to sell or
a solicitation of an offer to buy Meridian Energy securities and may
not be relied upon in connection with any purchase of Meridian
Energy securities.
The information contained in this presentation should be considered
in conjunction with the company’s financial statements, which are
available at:
www.meridianenergy.co.nz/investors
All currency amounts are in New Zealand dollars unless stated
otherwise.
31 MAY 2024NZAS CONTRACT ANNOUNCEMENT

---

COMMERCIAL IN CONFIDENCE
NEW ZEALAND ALUMINIUM SMELTERS LIMITED
Tiwai Road, Invercargill, Southland, New Zealand
Private Bag, 90110, Invercargill 9840
Courier / Delivery Address: 3 Spey Street, Invercargill
+64-3-218-5999
nzas.co.nz
02 May 2024
N
eal Barclay
Chief Executive
Meridian Energy Limited
(via email)
Dear Neal
E
nvironmental Remediation Update
Y
ou have asked for confirmation as to NZAS’ environmental remediation plans.
I
confirm on behalf of NZAS that we are satisfied as to the likelihood of stakeholder acceptance of our
environmental remediation plans, and the significant progress by NZAS on environmental remediation,
addressing outstanding historic issues, and partnering with iwi.
In particular, I would highlight the following:
−N
ZAS’ progressive MOU with Ngāi Tahu, signed in 2022, which has seen the formation of the
Remediation Advisory Working Group (RAWG), between Mana Whenua and NZAS to drive a true
partnership approach to remediation, and ensure iwi involvement in all decisions relating to
environmental efforts at Tiwai. Recent comments from Ngāi Tahu on the success of the partnership are
attached to this letter as is the original MOU announcement (see Annexure 1). The MOU marks a ne
w
c
hapter in NZAS’ long-term partnering with Ngāi Tahu and provides us a substantial foundation fo
r
m
ulti-lateral input on remediation, future planning, as well as partnering and economic development
opportunities.
−O
ngoing extensive monitoring, above and beyond regulatory requirements. A comprehensive review by
GHD in 2023, confirmed overall low risk of ecological impacts from our operations, and assisted NZAS in
identifying specific areas of focus for remediation going forward, which has also been confirmed by the
RAWG as priority areas. A similar, albeit less comprehensive study by Environment Southland, had
broadly similar conclusions and remediation focus areas. (the media release on the GHD report is
enclosed as Annexure 2)

COMMERCIAL IN CONFIDENCE
−Successful repatriation (to the Tiwai smelter site) and export of all ‘Ouvea Premix’ which had been
stored in the community.
−Commencement of export of Spent Cell Lining (SCL) from Tiwai to be processed in Australia and recycled
into cement manufacture, with over 20,000 tonnes planned for export in the next 12 months and
potential for a significant increase moving forward.
−Closure of the onsite landfill in 2022 and commencement of remediation planning for the site.
−Improved operating practices, including the maintenance of the drains (particularly removal of sediment
behind the weirs etc.) to reduce contaminant flux, the implementation of better management processes
for the discharge of stormwater prior to discharge and improvements to stormwater retention systems.
Potential engineered solutions are being explored through our co-design commitment with Ngāi Tahu.
A c
urrent snapshot of the status of the full remediation programme is enclosed as Annexure 3.
Fo
r completeness NZAS is committed to removing all SCL from the site during any remediation process. This
material will then be suitably processed along with any dross residues resulting from the smelting process.
Furthermore, NZAS is dedicated to progressively remediating land and water contamination to meet
appropriate environmental standards. The final closure solution of the landfill will form part of the overall
remediation plan and planning is currently underway with our partners Ngāi Tahu on this.
I t
rust this satisfies your concerns and am happy to discuss these in more detail with you and your team.
Al
though we have more work to do, now and moving forward, we are particularly proud of the significant
progress made in addressing present and historic environmental and operational matters of concern, and of the
platform we have developed internally and with partners, to set NZAS up for success in remediation and
sustainable operations.
Ngā
mihi
Ch
ris Blenkiron
CHIEF EXECUTIVE

ANNEXURE 1



MEDIA RELEASE

26 February 2024

Ngāi Tahu relationship with Tiwai a model for others
The partnership between NZAS, Rio Tinto and Ngāi Tahu is a demonstration of Te Tiriti o Waitangi
partnership in action, according to Jacqui Caine, Te Rūnanga o Ngāi Tahu Group Head of Strategy
& Environment, and a Trustee of Awarua Rūnaka.
Speaking at Te Rau Aroha marae in Bluff on Waitangi Day, Ms Caine shared her perspectives on how
NZAS and Rio Tinto are working collaboratively with Murihiku Rūnaka and Te Rūnanga o Ngāi Tahu
towards delivering against the Memorandum of Understanding (MOU) signed in 2022.
“Ngāi Tahu did not enter this relationship lightly. We wanted any relationship to be something that
went beyond tokenism and nice words, to be something firmly rooted in the expression of partnership
articulated in the Treaty.”
“I feel that we have been able to build a mutually beneficial relationship that is seeing substantial
progress on Tiwai’s site remediation, and engagement on environmental and broader community
programs, to ensure the overall significance and mana of the land, the Rūnaka and our history is taken
into account.”
“This relationship is nested within the Treaty of Waitangi principles of partnership, participation and
protection. The MOU captures a partnership that will ensure the voice of Murihiku Rūnaka is even
stronger regarding remediation and the future of the smelter. Mana whenua now participate in the
discussions on plans to remove waste, conduct environmental monitoring, and remediate the Tiwai
Point site, which is a key priority for mana whenua, NZAS and Rio Tinto.” Ms Caine said.
“The agreement is a commitment by the iwi to share mātauranga Māori (Māori knowledge) and
kōrero tuku iho (history and traditions) relative to Tiwai to support Rio Tinto to responsibly manage and
protect the environment as the future of the smelter is determined,” Ms Caine said.
She said the future of the smelter was a key concern for Awarua, Ngāi Tahu and the wider Southland
economy.
“Tiwai provides jobs for our whānau, and economic activity for our region. With the relationship we as
mana whenua now have with NZAS, we are confident that remediation will continue and that the
future contribution will not just be economic, but also cultural, as our partnership continues to
develop,” Ms Caine said.
NZAS Chief Executive Chris Blenkiron echoed these sentiments.
“The partnership with Ngāi Tahu and Awarua Rūnaka really is making a substantial difference in how
we operate currently, how we both deal with our legacy over 50 years, and how we plan for a future
which will embed a true and enduring partnership.
“The Treaty can often be a vexed topic, but putting its principles around partnership in action, as we
have done with our relationship with Ngāi Tahu and Awarua Rūnaka shows how it can drive tangible
long-term achievements for the benefits of everyone in the community,” Mr Blenkiron said.

The MOU signed in 2022 by Murihiku Rūnaka, Te Rūnanga o Ngāi Tahu, New Zealand Aluminium
Smelters Limited (NZAS) and Rio Tinto Aluminium Limited established a partnership to work together on
restoring the whenua (land) at the Tiwai Peninsula and the future of the Tiwai aluminium smelter
beyond December 2024.
The MOU established a Remediation Advisory Working Group, with representatives from Mana
Whenua and NZAS, and also initiated a NZ$2 million Community Development Fund, to provide
funding for organisations working in wellbeing, cultural, environmental, education and innovation and
economic development initiatives in the Southland community.
ENDS


Media contact:
For media enquiries please contact Senior Communications Advisor, Te Rūnanga o Ngāi Tahu
Crisselda De Leon-Singson, crisselda.deleon-singson@ngaitahu.iwi.nz

MEDIA RELEASE

4 October 2022

New agreement with mana whenua marks a positive step towards a future for Tiwai
Smelter
An agreement has been reached by Murihiku Rūnaka and Te Rūnanga o Ngāi Tahu with the New
Zealand Aluminium Smelters Limited (NZAS) and Rio Tinto Aluminium Limited to work together on
restoring the whenua (land) at the Tiwai Peninsula and the future of the Tiwai aluminium smelter
beyond December 2024.

The agreement was signed on Friday at Te Rau Aroha Marae at Motupōhue (Bluff) by representatives
from Murihiku Rūnaka and Te Rūnanga o Ngāi Tahu.
All parties agreed to work together on plans to remove waste, conduct environmental monitoring,
and remediate the Tiwai Point site, which is a key priority for mana whenua, NZAS and Rio Tinto.
NZAS Chief Executive Chris Blenkiron said “We’re proud to be working alongside Murihiku Rūnaka and
Te Rūnanga o Ngāi Tahu in continuing this important mahi. Their guidance will be invaluable as we
progressively remediate the site.”
“This agreement reinforces the commitments we’ve made to remove waste and remediate the site,
irrespective of the smelter’s future,” he said.
Murihiku Rūnaka hold mana whenua and mana moana over the region and are kaitiaki (guardians)
over the whenua and moana. Murihiku Rūnaka is comprised of four Papatipu Rūnanga including Te
Rūnaka o Awarua, W aihōpai Rūnaka, Ōraka Aparima Rūnaka and Hokonui Rūnanga.
Te Rūnaka o Awarua is leading the partnership on behalf of Murihiku Rūnaka and will actively engage
with NZAS and all parties around remediation, cultural considerations, and future intentions.
Upoko o Te Rūnaka o Awarua Tā Tipene O’Regan has advocated for this partnership and is pleased
to reach this milestone.
“I have always believed there is a future for this land. Now we can engage in responsible
environmental management and look at a long-term future for Tiwai.”
“It is important to note that while the remediation issue is led by Te Rūnaka o Awarua, it is also
supported by other Rūnaka within Murihiku,” he said.
The agreement is a commitment by the iwi to share mātauranga Māori (Māori knowledge) and kōrero
tuku iho (history and traditions) relative to Tiwai to support Rio Tinto to responsibly manage the
environment as the future of the smelter is determined.
Rio Tinto Aluminium Chief Executive Ivan Vella said “NZAS produces some of the lowest carbon, highest
purity aluminium in the world. W e are working hard to secure a longer future for NZAS so it can continue
supporting global decarbonisation, and we must make sure its environmental performance matches
these objectives.”
“Rio Tinto is working to improve our relat ionship with mana whenua and to do this in a way that
recognises their kaitiaki responsibilities. This partnership demonstrates how we intend to operate in
Aotearoa going forward,” he said.

All parties believe the region has a strong future with a range of potential new industries, technologies
and renewable energy bringing new jobs and a wide range of economic benefits.
ENDS


Note to Editors
Image caption: Representatives from Murihiku Rūnaka and Te Rūnanga o Ngāi Tahu sign the
agreement.
Seated L-R: Michael Stevens (Te Rūnanga o Awarua Alt Rep); Rewi Davis (Ōraka Aparima
Rūnaka Rep); Cyril Gilroy (Chair Waihōpai Rūnaka); Terry Nicholas (Hokonui Rūnanga Rep);
Riki Dallas (Kaihautū - General Manager Ōraka Aparima Rūnaka); Dean Whaanga
(Kaiwhakahaere Awarua Rūnaka)
Standing L-R: Albert Brantley (Advisor to parties); Megan Reid (Project Manager for Awarua
Working Group); Gail Thomson (Te Rūnanga o Awarua Rep); Nicole Atherton (Rio Tinto
General Manager Closure Readiness)


Media contacts:
For media enquiries for Rio Tinto and NZAS please contact: Jonathan Webb,
jonathan.webb@riotinto.com
, 021 044 8453
For media enquiries for the Murihiku Rūnaka collective, including Te Rūnaka o Awarua, Te
Rūnanga o Ngāi Tahu please contact: Belinda Milnes, belinda@sbaconsulting.co.nz
021 802
447 or Crisselda De Leon-Singson, crisselda.deleon-singson@ngaitahu.iwi.nz 021 051 6239

ANNEXURE 2

Please direct all enquiries to:
Media Release simon.king2@riotinto.com


For Immediate Release
10 November 2023
Embargoed until 6am

Extensive environmental testing at Tiwai concludes low risk of
human or ecological impact
New Zealand’s Aluminium Smelter (NZAS) has today released a report undertaken by global professional
services company GHD which concluded that there was a limited risk to marine ecology and no increased
risk of health effects for people who come into contact with sediment and surface water or consume kai
moana inhabiting the surrounding coastal marine area.
NZAS engaged GHD to complete extensive testing in and around the Tiwai smelter site to further build on
the findings of a detailed site investigation undertaken in 2021 to establish baseline indicators for the site.
NZAS is committed to further improving its environmental footprint and mitigating the impacts of the smelter.

The purpose of this report and the investigations was to understand discharges occurring from the smelter
and to determine whether these were having an adverse effect on the ecology of the coastal marine area
environment, or people using the coastal area for recreation and food gathering. As part of the investigation,
concentrations of analytes in soil, sediment, groundwater and ocean water were compared to various
regulatory criteria as per Ministry of Environment guidelines.

Given the importance of mahinga kai (food gathering) activities at or near Awarua/Tiwai peninsula to Ngāi
Tahu, this work included testing of kaimoana (seafood) in the coastal marine area adjacent to the site.
The report made three key findings:
• There is no increased risk of health effects from the smelter and its operations for people who come
into contact with sediment and surface water within the coastal marine area or consume seafood
inhabiting nearshore areas of the coastal marine area.
• There is a limited risk to marine ecology related to discharges from the landfill. While localised
effects on aquatic organisms are plausible, elevated concentrations of copper found in marine water
near the landfill are unlikely to have a measurable long-term effect. Elevated copper concentrations
were evident in water quality samples from numerous locations around Bluff Harbour, including other
locations distant from the NZAS smelter indicating secondary sources.
• The three drains are the primary pathway for contaminant transport towards the coastal marine area.
Within the vicinity of the North Drain discharge point, adverse effects to aquatic organisms are
plausible, however, once discharge reaches the coastal marine area, beyond the drain water mixing
zone, there is a low risk of measurable adverse long-term effects on aquatic organisms.
The studies undertaken by GHD in 2021 - 2023 support the findings of previous studies released in 1995
and 2006 that discharges from NZAS drains were having a limited impact upon marine species within the
coastal marine area.

NZAS Chief Executive Chris Blenkiron said, “We are pleased with the findings of the report as they provide
us with confidence that we are implementing effective actions to mitigate the smelter’s environmental impact
but it also provides us with clarity around where we can look to do better.”

Media Release 2 / 2
“
Tiwai is more than 50 years old, and we acknowledge that our practices haven’t always met expectations
but we’ve worked hard to improve our environmental record and this report confirms we’re doing the right
things.”
“In particular, I was really pleased that the report found that there was no increased risk of health effects for
people consuming kai moana from the surrounding coastal marine area. Food gathering from the ocean is
incredibly significant to our Ngāi Tahu partners but also our wider community here in Southland.”
S
pokesperson for Ngāi Tahu, Jacqui Caine said “Ngāi Tahu has welcomed the partnership with NZAS on
remediating the whenua (land) and coastal environment around Tiwai Point. Protection of mahinga kai
activities is of upmost importance to Awarua and Ngāi Tahu more broadly. It is reassuring to know that the
kai moana in the harbour is safe to eat and that we can continue this important practice that we have done
for several hundred years.”
A memorandum of understanding (MoU) was agreed in 2022 between Murihiku Rūnaka and Te Rūnanga o
Ngāi Tahu with the New Zealand Aluminium Smelters Limited (NZAS) and Rio Tinto Aluminium Limited. The
parties have been working closely together over the last year to build a shared vision of remediation of the
site.
T
he Advisory Group established under the MoU works to protect both Te Ao Tūroa (natural environment)
and mahinga kai activities at or near Awarua/Tiwai peninsula coastal environment. With technical support
from a joint Remediation Working Group, site specific remediation criteria have been co-designed with NZAS
and Rio Tinto. A plan for the remediation of the onsite drain network is currently under development.
“W
e are really pleased with the progress made in developing a partnership with NZAS to remediate the site.
The first remediation plan we are co-designing is for the drain network. The GHD report confirms we have
selected the right focus area and we are looking forward to continuing this important mahi,” Caine said
Siobhan Hartwell, Regional General Manager NZ Pacific for GHD said “Our extensive programme of
investigations has helped NZAS build a detailed picture of the site and the surrounding environment. Our
technical support for NZAS will help the continuing environmental improvements and remediation of Tiwai.”
A f
ull copy of the report, including an executive summary, can be found at Sustainability | New Zealand's

Aluminium Smelter | NZAS
ENDS
Background: Ongoing environmental testing and monitoring
•
• As part of NZAS’ commitment to the environment, regular monitoring and testing of environmental
impacts provides important indicators to ensure the measures in place are effective and further work
is prioritised appropriately.
•The detailed site Investigation (DSI), completed in 2021, started to provide a baseline of site
conditions.
•The 2021 DSI report recommended further testing to continue to build on knowledge of site
conditions and understand any seasonal variation.
•When NZAS released the DSI we committed to keeping the community updated as work progressed
and
we have proactively met this commitment.
•GHD is a company with expertise in contamination assessment and remediation and have specialist
skills in environmental testing and monitoring.
•This GHD report was an important part of the work undertaken by the Advisory Group established to
enab
le Te Rūnaka o Awarua and NZAS to work together to progress remediation priorities a
nd
c
riteria.
NZAS is a joint venture company owned by Rio Tinto (80%) and Sumitomo Chemical Company of Japan
(20%).
C
ontact: Simon King (021) 2425723

REMEDIATION AND BY-PRODUCTS
We will remediate the site, irrespective of the date production
ceases, and work is already underway to remove waste and
improve our environmental performance.
NG
-
AI TAHU PARTNERSHIP
Murihiku Runaka and Ngāi Tahu with
NZASand Rio Tinto have an agreement to
work together on restoring the whenua at the
Tiwai Peninsula and thefuture of the Tiw
ai
aluminium smelter beyond December 2024.
All parties are working together on plans
to remove waste, conduct environmental
monitoring, and remediate the Tiwai Point
site, which is a key priority for mana
whenua, NZAS and Rio Tinto.
LANDFILL
No further waste
to be deposited in onsite
landfill.
DROSS
RESIDUES
Commercial contracts
are in place for 42,000
tonnes to be processed
and recycled.
These contracts cover
100% of Ouvea and MRP
landfilled dross residue.
SCL
Commercial contracts
are in place for up to
30,000 tonnes per
annum to be exported
for processing and
recycling offshore.
SMELTER
1. Carbon
2.Reduction lines
3.Power supply
4.Raw material storage
5.Workshops and labs
6.Casting
1
4
5
6
23
BLUFF
LandfillSmelterDross ResiduesSCLDrains
Key:
TIWAI PENINSULA
VERSION FOUR – STATUS AS AT 31 OCTOBER 2023
LANDFILL
No further waste
to be deposited in
onsite landfill.
DROSS
RESIDUES
Commercial contracts
are in place for 42,000
tonnes to be processed
and recycled.
These contracts cover
100% of Ouvea and MRP
landfilled dross residue.
SCL
Commercial contracts
are in place for up to
30,000 tonnes per
annum to be exported
for processing and
recycling offshore.
SMELTER
1.Carbon
2.Reduction lines
3.Power supply
4.Raw material storage
5.Workshops and labs
6.Casting
1
4
5
6
23
BLUFF
LandfillSmelterDross ResiduesSCLDrains
Key:
TIWAI PENINSULA
REMEDIATION AND BY-PRODUCTS
We will remediate the site, irrespective of the date production
ceases, and work is already underway to remove waste and
improve our environmental performance.
NG
-
AI TAHU PARTNERSHIP
Murihiku R
-
unaka and Ng
-
ai Tahu with NZAS
and Rio Tinto have an agreement to work
together on restoring the whenua at the
Tiwai Peninsula and thefuture of the Tiwai
aluminium smelter beyond December 2024.
All parties are working together on plans
to remove waste, conduct environmental
monitoring, and remediate the Tiwai Point
site, which is a key priority for mana
whenua, NZAS and Rio Tinto.
VERSION THREE – STATUS AS AT 15 MAY 2023
PROGRESSIVEPROGRESSIVE
REMEDIATIONREMEDIATION
OBJECTIVESOBJECTIVES
(agreed with Awarua
Representatives on
Advisory Group):
SPENT CELLSPENT CELL
LINING (SCL)LINING (SCL)
Remove all SCL from the Tiwai
peninsula, to be recycled for
alternative industrial use by 2029.
DROSSDROSS
RESIDUESRESIDUES
Return all Ouvea stored in the community
back to NZAS site. Process and remove all
dross residues from the Tiwai peninsula,
to be recycledfor alternative industrial
use by 2029.
LAND & WATERLAND & WATER
CONTAMINATIONCONTAMINATION
Progressively remediate the site to
protect Te Ao T
-
uroa (natural environment)
and mahinga kai (food gathering) activities
at or near Awarua/Tiwai peninsula coastal
environment.
ONSITEONSITE
LANDFILLLANDFILL
Develop a long-term pathway for the
closure of the landfill with an initial
focus on seeking reuse and recycling
options for material in the landfill to
align with our waste philosophy.
CULTURALCULTURAL
HERITAGEHERITAGE
Identify, protect and preserve
wahi tapu, wahi taonga and other
sites of significance at Tiwai Point.
LANDFILL
No further waste
to be deposited in
onsite landfill.
DROSS
RESIDUES
Commercial contracts
are in place for 42,000
tonnes to be processed
and recycled.
These contracts cover
100% of Ouvea and MRP
landfilled dross residue.
SCL
Commercial contracts
are in place for up to
30,000 tonnes per
annum to be exported
for processing and
recycling offshore.
SMELTER
1.Carbon
2.Reduction lines
3.Power supply
4.Raw material storage
5.Workshops and labs
6.Casting
1
4
5
6
23
BLUFF
LandfillSmelterDross ResiduesSCLDrains
Key:
TIWAI PENINSULA
REMEDIATION AND BY-PRODUCTS
We will remediate the site, irrespective of the date production
ceases, and work is already underway to remove waste and
improve our environmental performance.
NG
-
AI TAHU PARTNERSHIP
Murihiku R
-
unaka and Ng
-
ai Tahu with NZAS
and Rio Tinto have an agreement to work
together on restoring the whenua at the
Tiwai Peninsula and thefuture of the Tiwai
aluminium smelter beyond December 2024.
All parties are working together on plans
to remove waste, conduct environmental
monitoring, and remediate the Tiwai Point
site, which is a key priority for mana
whenua, NZAS and Rio Tinto.
VERSION THREE – STATUS AS AT 15 MAY 2023
PROGRESSIVEPROGRESSIVE
REMEDIATIONREMEDIATION
OBJECTIVESOBJECTIVES
(agreed with Awarua
Representatives on
Advisory Group):
SPENT CELLSPENT CELL
LINING (SCL)LINING (SCL)
Remove all SCL from the Tiwai
peninsula, to be recycled for
alternative industrial use by 2029.
DROSS DROSS
RESIDUES RESIDUES
Return all Ouvea stored in the community
back to NZAS site. Process and remove all
dross residues from the Tiwai peninsula,
to be recycledfor alternative industrial
use by 2029.
LAND & WATER LAND & WATER
CONTAMINATIONCONTAMINATION
Progressively remediate the site to
protect Te Ao T
-
uroa (natural environment)
and mahinga kai (food gathering) activities
at or near Awarua/Tiwai peninsula coastal
environment.
ONSITEONSITE
LANDFILLLANDFILL
Develop a long-term pathway for the
closure of the landfill with an initial
focus on seeking reuse and recycling
options for material in the landfill to
align with our waste philosophy.
CULTURALCULTURAL
HERITAGEHERITAGE
Identify, protect and preserve
wahi tapu, wahi taonga and other
sites of significance at Tiwai Point.
ANNEXURE 3

LANDFILLLANDFILL
Closure study for landfill
Commence closure
execution for landfill
Existing landfill volume approx.
807,000m
3
—Ceased depositing any waste in NZAS landfill from May 2022
—Extensive environmental assessments within and around the
landfill including groundwater monitoring, ecological assessments,
water, soil, marine sediment and marine biota sampling
—RAWG work together on the consent
requirements for the existing landfill, with
the initial focus on seeking reuse and recycling
options for material in the landfill to align with
our waste philosophy of reduce, reuse and recycle
Potential landfill materials that
could be reused / recycled:
—Dross residues – c. 33,500 tonnes
—Carbon fines – c. 100,000 tonnes
Reduction of waste
LAND & WATER LAND & WATER
CONTAMINATIONCONTAMINATION
Address possible
contamination sources
Continue progressive
remediation
We have shared
20 years of groundwater
monitoring results from the SCL
pad & landfill along with the results
of our Detailed Site Investigation

—Additional five rounds of environmental testing
(based on results of DSI)
—Extensive sampling within the Coastal Marine Environment
—Additional 50 groundwater monitoring bores installed
Actions to prevent further contamination
to soil and groundwater
—By-products storage facility constructed
—Ceased wet washing of reduction cell shells and superstructures
—Improvements to washdown facility
Commence progressive remediationCommence progressive remediation
—Remediation Advisory Working Group
(RAWG) established with Ng
-
ai Tahu
—RAWG co-design the standard and
criteria for progressive remediation
—Develop the remediation plan for the
first area of land to be remediated
—Develop the remediation plan for the
drain network and assess options for
future open drain design
Further testing to increase
understanding of contamination sites
SPENT CELL LINING (SCL)SPENT CELL LINING (SCL)
—Complete Pre-Feasibility Study for
onsite SCL processing plant
—Continue disposal of SCL through
export pathways
30,000 tonnes
of SCL exported (target)
Stored SCL
removed by 2029 (target)
220,000 tonnes
of SCL stored on site
(approximately)
—5,500 tonnes of SCL exported
—Sampling/characterisation of SCL pad material
17,000 tonnes
of SCL exported (target)
DROSS RESIDUES DROSS RESIDUES
8,000 tonnes
of Ouvea exported (target)
—5,350 tonnes of Ouvea processed and exported
—Commenced recovery and processing of
MRP dross residue (landfill)
—Sampling of Haysom’s dross residue
Stored dross
residues
processed and removed
by 2029 (target)
55,000 tonnes of dross
residue to be processed
—21,500 tonnes of Ouvea
—20,000 tonnes of MRP (landfill)
—13,500 tonnes of Haysom’s (landfill)
3,000 tonnes
of dross exported (target)
—100% (24,800 tonnes)of Ouvea stored
in community returned to site
—7,800 tonnes of Ouvea exported
20232024–20302022
REMEDIATION TIMELINE
VERSION THREE – STATUS AS AT 15 MAY 2023
LANDFILLLANDFILL
Closure study for landfill
Commence closure
execution for landfill
Existing landfill volume approx.
807,000m
3
—Ceased depositing any waste in NZAS landfill from May 2022
—Extensive environmental assessments within and around the
landfill including groundwater monitoring, ecological assessments,
water, soil, marine sediment and marine biota sampling
—RAWG work together on the consent
requirements for the existing landfill, with
the initial focus on seeking reuse and recycling
options for material in the landfill to align with
our waste philosophy of reduce, reuse and recycle
Potential landfill materials that
could be reused / recycled:
—Dross residues – c. 33,500 tonnes
—Carbon fines – c. 100,000 tonnes
Reduction of waste
LAND & WATERLAND & WATER
CONTAMINATIONCONTAMINATION
Address possible
contamination sources
Continue progressive
remediation
We have shared
20 yearsof groundwater
monitoring results from the SCL
pad & landfill along with the results
of our Detailed Site Investigation
—Additional five rounds of environmental testing
(based on results of DSI)
—Extensive sampling within the Coastal Marine Environment
—Additional 50 groundwater monitoring bores installed
Actions to prevent further contamination
to soil and groundwater
—B y-products storage facility constructed
—Ceased wet washing of reduction cell shells and superstructures
—Improvements to washdown facility
Commence progressive remediationCommence progressive remediation
—Remediation Advisory Working Group
(RAWG) established with Ng
-
ai Tahu
—RAWG co-design the standard and
criteria for progressive remediation
—Develop the remediation plan for the
first area of land to be remediated
—Develop the remediation plan for the
drain network and assess options for
future open drain design
Further testing to increase
understanding of contamination sites
SPENT CELL LINING (SCL)SPENT CELL LINING (SCL)
—Complete Pre-Feasibility Study for
onsite SCL processing plant
—Continue disposal of SCL through
export pathways
30,000tonnes
of SCL exported (target)
Stored SCL
removed by 2029 (target)
220,000tonnes
of SCL stored on site
(approximately)
—5,500 tonnes of SCL exported
—Sampling/characterisation of SCL pad material
17,000 tonnes
of SCL exported (target)
DROSS RESIDUESDROSS RESIDUES
8,000tonnes
of Ouvea exported (target)
—5,350 tonnes of Ouvea processed and exported
—Commenced recovery and processing of
MRP dross residue (landfill)
—Sampling of Haysom’s dross residue
Stored dross
residues
processed and removed
by 2029 (target)
55,000tonnes of dross
residue to be processed
—21,500 tonnes of Ouvea
—20,000 tonnes of MRP (landfill)
—13,500 tonnes of Haysom’s (landfill)
3,000tonnes
of dross exported (target)
—100% (24,800 tonnes)of Ouvea stored
in community returned to site
—7,800 tonnes of Ouvea exported
20232024–20302022
REMEDIATION TIMELINE
VERSION THREE – STATUS AS AT 15 MAY 2023
LANDFILLLANDFILL
Closure study for landfill
Commence closure
execution for landfill
Existing landfill volume approx.
807,000m
3
—Ceased depositing any waste in NZAS landfill from May 2022
—Extensive environmental assessments within and around the
landfill including groundwater monitoring, ecological assessments,
water, soil, marine sediment and marine biota sampling
—RAWG work together on the consent
requirements for the existing landfill, with
the initial focus on seeking reuse and recycling
options for material in the landfill to align with
our waste philosophy of reduce, reuse and recycle
Potential landfill materials that
could be reused / recycled:
—Dross residues – c. 33,500 tonnes
—Carbon fines – c. 100,000 tonnes
Reduction of waste
LAND & WATERLAND & WATER
CONTAMINATIONCONTAMINATION
Address possible
contamination sources
Continue progressive
remediation
We have shared
20 yearsof groundwater
monitoring results from the SCL
pad & landfill along with the results
of our Detailed Site Investigation
—Additional five rounds of environmental testing
(based on results of DSI)
—Extensive sampling within the Coastal Marine Environment
—Additional 50 groundwater monitoring bores installed
Actions to prevent further contamination
to soil and groundwater
—B y-products storage facility constructed
—Ceased wet washing of reduction cell shells and superstructures
—Improvements to washdown facility
Commence progressive remediationCommence progressive remediation
—Remediation Advisory Working Group
(RAWG) established with Ng
-
ai Tahu
—RAWG co-design the standard and
criteria for progressive remediation
—Develop the remediation plan for the
first area of land to be remediated
—Develop the remediation plan for the
drain network and assess options for
future open drain design
Further testing to increase
understanding of contamination sites
SPENT CELL LINING (SCL)SPENT CELL LINING (SCL)
—Complete Pre-Feasibility Study for
onsite SCL processing plant
—Continue disposal of SCL through
export pathways
30,000tonnes
of SCL exported (target)
Stored SCL
removed by 2029 (target)
220,000tonnes
of SCL stored on site
(approximately)
—5,500 tonnes of SCL exported
—Sampling/characterisation of SCL pad material
17,000 tonnes
of SCL exported (target)
DROSS RESIDUESDROSS RESIDUES
8,000tonnes
of Ouvea exported (target)
—5,350 tonnes of Ouvea processed and exported
—Commenced recovery and processing of
MRP dross residue (landfill)
—Sampling of Haysom’s dross residue
Stored dross
residues
processed and removed
by 2029
(target)
55,000tonnes of dross
residue to be processed
—21,500 tonnes of Ouvea
—20,000 tonnes of MRP (landfill)
—13,500 tonnes of Haysom’s (landfill)
3,000tonnes
of dross exported (target)
—100% (24,800 tonnes)of Ouvea stored
in community returned to site
—7,800 tonnes of Ouvea exported
20232024–20302022
REMEDIATION TIMELINE
VERSION THREE – STATUS AS AT 15 MAY 2023
On-site facility:
—Pre-Feasibility study completed.
—Funding approved to finalise study work.
—Consent application development started.
Export:
—2,000T planned to be exported in Q4.
—All remaining Ouvea will be exported by end of
2023
—1,800 tonnes of MRP dross residue (landfill)
recycled YTD
—Sampling of Haysom’s Dross Residue.
—Remediation Advisory Working Group (RAWG)
established with Ngai Tahu
—RAWG co-design the standard and criteria for
progressive remediation
—Draft remediation plan created for the first area
of land to be remediated
—Draft remediation plan for the drain network and
assess options for future open drain design
—RAWG supported strategy change to submit a short
term 5 year consent for landfill to provide time to
develop appropriate long term closure design.
—5 year consent submitted to ES.
LANDFILLLANDFILL
Closure study for landfill
Commence closure
execution for landfill
Existing landfill volume approx.
807,000m
3
—Ceased depositing any waste in NZAS landfill from May 2022
—Extensive environmental assessments within and around the
landfill including groundwater monitoring, ecological assessments,
water, soil, marine sediment and marine biota sampling
—RAWG work together on the consent
requirements for the existing landfill, with
the initial focus on seeking reuse and recycling
options for material in the landfill to align with
our waste philosophy of reduce, reuse and recycle
Potential landfill materials that
could be reused / recycled:
—Dross residues – c. 33,500 tonnes
—Carbon fines – c. 100,000 tonnes
Reduction of waste
LAND & WATERLAND & WATER
CONTAMINATIONCONTAMINATION
Address possible
contamination sources
Continue progressive
remediation
We have shared
20 yearsof groundwater
monitoring results from the SCL
pad & landfill along with the results
of our Detailed Site Investigation
—Additional five rounds of environmental testing
(based on results of DSI)
—Extensive sampling within the Coastal Marine Environment
—Additional 50 groundwater monitoring bores installed
Actions to prevent further contamination
to soil and groundwater
—B y-products storage facility constructed
—Ceased wet washing of reduction cell shells and superstructures
—Improvements to washdown facility
Commence progressive remediationCommence progressive remediation
—Remediation Advisory Working Group
(RAWG) established with Ng
-
ai Tahu
—RAWG co-design the standard and
criteria for progressive remediation
—Develop the remediation plan for the
first area of land to be remediated
—Develop the remediation plan for the
drain network and assess options for
future open drain design
Further testing to increase
understanding of contamination sites
SPENT CELL LINING (SCL)SPENT CELL LINING (SCL)
—Complete Pre-Feasibility Study for
onsite SCL processing plant
—Continue disposal of SCL through
export pathways
30,000tonnes
of SCL exported (target)
Stored SCL
removed by 2029 (target)
220,000tonnes
of SCL stored on site
(approximately)
—5,500 tonnes of SCL exported
—Sampling/characterisation of SCL pad material
17,000 tonnes
of SCL exported (target)
DROSS RESIDUESDROSS RESIDUES
8,000tonnes
of Ouvea exported (target)
—5,350 tonnes of Ouvea processed and exported
—Commenced recovery and processing of
MRP dross residue (landfill)
—Sampling of Haysom’s dross residue
Stored dross
residues
processed and removed
by 2029 (target)
55,000tonnes of dross
residue to be processed
—21,500 tonnes of Ouvea
—20,000 tonnes of MRP (landfill)
—13,500 tonnes of Haysom’s (landfill)
3,000tonnes
of dross exported (target)
—100% (24,800 tonnes)of Ouvea stored
in community returned to site
—7,800 tonnes of Ouvea exported
20232024–20302022
REMEDIATION TIMELINE
VERSION THREE – STATUS AS AT 15 MAY 2023
LANDFILLLANDFILL
Closure study for landfill
Commence closure
execution for landfill
Existing landfill volume approx.
807,000m
3
—Ceased depositing any waste in NZAS landfill from May 2022
—Extensive environmental assessments within and around the
landfill including groundwater monitoring, ecological assessments,
water, soil, marine sediment and marine biota sampling
—RAWG work together on the consent
requirements for the existing landfill, with
the initial focus on seeking reuse and recycling
options for material in the landfill to align with
our waste philosophy of reduce, reuse and recycle
Potential landfill materials that
could be reused / recycled:
—Dross residues – c. 33,500 tonnes
—Carbon fines – c. 100,000 tonnes
Reduction of waste
LAND & WATERLAND & WATER
CONTAMINATIONCONTAMINATION
Address possible
contamination sources
Continue progressive
remediation
We have shared
20 yearsof groundwater
monitoring results from the SCL
pad & landfill along with the results
of our Detailed Site Investigation
—Additional five rounds of environmental testing
(based on results of DSI)
—Extensive sampling within the Coastal Marine Environment
—Additional 50 groundwater monitoring bores installed
Actions to prevent further contamination
to soil and groundwater
—B y-products storage facility constructed
—Ceased wet washing of reduction cell shells and superstructures
—Improvements to washdown facility
Commence progressive remediationCommence progressive remediation
—Remediation Advisory Working Group
(RAWG) established with Ng
-
ai Tahu
—RAWG co-design the standard and
criteria for progressive remediation
—Develop the remediation plan for the
first area of land to be remediated
—Develop the remediation plan for the
drain network and assess options for
future open drain design
Further testing to increase
understanding of contamination sites
SPENT CELL LINING (SCL)SPENT CELL LINING (SCL)
—Complete Pre-Feasibility Study for
onsite SCL processing plant
—Continue disposal of SCL through
export pathways
30,000tonnes
of SCL exported (target)
Stored SCL
removed by 2029 (target)
220,000tonnes
of SCL stored on site
(approximately)
—5,500 tonnes of SCL exported
—Sampling/characterisation of SCL pad material
17,000 tonnes
of SCL exported (target)
DROSS RESIDUESDROSS RESIDUES
8,000tonnes
of Ouvea exported (target)
—5,350 tonnes of Ouvea processed and exported
—Commenced recovery and processing of
MRP dross residue (landfill)
—Sampling of Haysom’s dross residue
Stored dross
residues
processed and removed
by 2029 (target)
55,000tonnes of dross
residue to be processed
—21,500 tonnes of Ouvea
—20,000 tonnes of MRP (landfill)
—13,500 tonnes of Haysom’s (landfill)
3,000tonnes
of dross exported (target)
—100% (24,800 tonnes)of Ouvea stored
in community returned to site
—7,800 tonnes of Ouvea exported
20232024–20302022
REMEDIATION TIMELINE
VERSION THREE – STATUS AS AT 15 MAY 2023
LANDFILLLANDFILL
Closure study for landfill
Commence closure
execution for landfill
Existing landfill volume approx.
807,000m
3
—Ceased depositing any waste in NZAS landfill from May 2022
—Extensive environmental assessments within and around the
landfill including groundwater monitoring, ecological assessments,
water, soil, marine sediment and marine biota sampling
—RAWG work together on the consent
requirements for the existing landfill, with
the initial focus on seeking reuse and recycling
options for material in the landfill to align with
our waste philosophy of reduce, reuse and recycle
Potential landfill materials that
could be reused / recycled:
—Dross residues – c. 33,500 tonnes
—Carbon fines – c. 100,000 tonnes
Reduction of waste
LAND & WATERLAND & WATER
CONTAMINATIONCONTAMINATION
Address possible
contamination sources
Continue progressive
remediation
We have shared
20 yearsof groundwater
monitoring results from the SCL
pad & landfill along with the results
of our Detailed Site Investigation
—Additional five rounds of environmental testing
(based on results of DSI)
—Extensive sampling within the Coastal Marine Environment
—Additional 50 groundwater monitoring bores installed
Actions to prevent further contamination
to soil and groundwater
—B y-products storage facility constructed
—Ceased wet washing of reduction cell shells and superstructures
—Improvements to washdown facility
Commence progressive remediationCommence progressive remediation
—Remediation Advisory Working Group
(RAWG) established with Ng
-
ai Tahu
—RAWG co-design the standard and
criteria for progressive remediation
—Develop the remediation plan for the
first area of land to be remediated
—Develop the remediation plan for the
drain network and assess options for
future open drain design
Further testing to increase
understanding of contamination sites
SPENT CELL LINING (SCL)SPENT CELL LINING (SCL)
—Complete Pre-Feasibility Study for
onsite SCL processing plant
—Continue disposal of SCL through
export pathways
30,000tonnes
of SCL exported (target)
Stored SCL
removed by 2029 (target)
220,000tonnes
of SCL stored on site
(approximately)
—5,500 tonnes of SCL exported
—Sampling/characterisation of SCL pad material
17,000 tonnes
of SCL exported (target)
DROSS RESIDUESDROSS RESIDUES
8,000tonnes
of Ouvea exported (target)
—5,350 tonnes of Ouvea processed and exported
—Commenced recovery and processing of
MRP dross residue (landfill)
—Sampling of Haysom’s dross residue
Stored dross
residues
processed and removed
by 2029 (target)
55,000tonnes of dross
residue to be processed
—21,500 tonnes of Ouvea
—20,000 tonnes of MRP (landfill)
—13,500 tonnes of Haysom’s (landfill)
3,000tonnes
of dross exported (target)
—100% (24,800 tonnes)of Ouvea stored
in community returned to site
—7,800 tonnes of Ouvea exported
20232024–20302022
REMEDIATION TIMELINE
VERSION THREE – STATUS AS AT 15 MAY 2023
LANDFILLLANDFILL
Closure study for landfill
Commence closure
execution for landfill
Existing landfill volume approx.
807,000m
3
—Ceased depositing any waste in NZAS landfill from May 2022
—Extensive environmental assessments within and around the
landfill including groundwater monitoring, ecological assessments,
water, soil, marine sediment and marine biota sampling
—RAWG work together on the consent
requirements for the existing landfill, with
the initial focus on seeking reuse and recycling
options for material in the landfill to align with
our waste philosophy of reduce, reuse and recycle
Potential landfill materials that
could be reused / recycled:
—Dross residues – c. 33,500 tonnes
—Carbon fines – c. 100,000 tonnes
Reduction of waste
LAND & WATERLAND & WATER
CONTAMINATIONCONTAMINATION
Address possible
contamination sources
Continue progressive
remediation
We have shared
20 yearsof groundwater
monitoring results from the SCL
pad & landfill along with the results
of our Detailed Site Investigation
—Additional five rounds of environmental testing
(based on results of DSI)
—Extensive sampling within the Coastal Marine Environment
—Additional 50 groundwater monitoring bores installed
Actions to prevent further contamination
to soil and groundwater
—B y-products storage facility constructed
—Ceased wet washing of reduction cell shells and superstructures
—Improvements to washdown facility
Commence progressive remediationCommence progressive remediation
—Remediation Advisory Working Group
(RAWG) established with Ng
-
ai Tahu
—RAWG co-design the standard and
criteria for progressive remediation
—Develop the remediation plan for the
first area of land to be remediated
—Develop the remediation plan for the
drain network and assess options for
future open drain design
Further testing to increase
understanding of contamination sites
SPENT CELL LINING (SCL)SPENT CELL LINING (SCL)
—Complete Pre-Feasibility Study for
onsite SCL processing plant
—Continue disposal of SCL through
export pathways
30,000tonnes
of SCL exported (target)
Stored SCL
removed by 2029 (target)
220,000tonnes
of SCL stored on site
(approximately)
—5,500 tonnes of SCL exported
—Sampling/characterisation of SCL pad material
17,000 tonnes
of SCL exported (target)
DROSS RESIDUESDROSS RESIDUES
8,000tonnes
of Ouvea exported (target)
—5,350 tonnes of Ouvea processed and exported
—Commenced recovery and processing of
MRP dross residue (landfill)
—Sampling of Haysom’s dross residue
Stored dross
residues
processed and removed
by 2029 (target)
55,000tonnes of dross
residue to be processed
—21,500 tonnes of Ouvea
—20,000 tonnes of MRP (landfill)
—13,500 tonnes of Haysom’s (landfill)
3,000tonnes
of dross exported (target)
—100% (24,800 tonnes)of Ouvea stored
in community returned to site
—7,800 tonnes of Ouvea exported
20232024–20302022
REMEDIATION TIMELINE
VERSION THREE – STATUS AS AT 15 MAY 2023
LANDFILLLANDFILL
Closure study for landfill
Commence closure
execution for landfill
Existing landfill volume approx.
807,000m
3
—Ceased depositing any waste in NZAS landfill from May 2022
—Extensive environmental assessments within and around the
landfill including groundwater monitoring, ecological assessments,
water, soil, marine sediment and marine biota sampling
—RAWG work together on the consent
requirements for the existing landfill, with
the initial focus on seeking reuse and recycling
options for material in the landfill to align with
our waste philosophy of reduce, reuse and recycle
Potential landfill materials that
could be reused / recycled:
—Dross residues – c. 33,500 tonnes
—Carbon fines – c. 100,000 tonnes
Reduction of waste
LAND & WATERLAND & WATER
CONTAMINATIONCONTAMINATION
Address possible
contamination sources
Continue progressive
remediation
We have shared
20 yearsof groundwater
monitoring results from the SCL
pad & landfill along with the results
of our Detailed Site Investigation
—Additional five rounds of environmental testing
(based on results of DSI)
—Extensive sampling within the Coastal Marine Environment
—Additional 50 groundwater monitoring bores installed
Actions to prevent further contamination
to soil and groundwater
—B y-products storage facility constructed
—Ceased wet washing of reduction cell shells and superstructures
—Improvements to washdown facility
Commence progressive remediationCommence progressive remediation
—Remediation Advisory Working Group
(RAWG) established with Ng
-
ai Tahu
—RAWG co-design the standard and
criteria for progressive remediation
—Develop the remediation plan for the
first area of land to be remediated
—Develop the remediation plan for the
drain network and assess options for
future open drain design
Further testing to increase
understanding of contamination sites
SPENT CELL LINING (SCL)SPENT CELL LINING (SCL)
—Complete Pre-Feasibility Study for
onsite SCL processing plant
—Continue disposal of SCL through
export pathways
30,000tonnes
of SCL exported (target)
Stored SCL
removed by 2029 (target)
220,000tonnes
of SCL stored on site
(approximately)
—5,500 tonnes of SCL exported
—Sampling/characterisation of SCL pad material
17,000 tonnes
of SCL exported (target)
DROSS RESIDUESDROSS RESIDUES
8,000tonnes
of Ouvea exported (target)
—5,350 tonnes of Ouvea processed and exported
—Commenced recovery and processing of
MRP dross residue (landfill)
—Sampling of Haysom’s dross residue
Stored dross
residues
processed and removed
by 2029
(target)
55,000tonnes of dross
residue to be processed
—21,500 tonnes of Ouvea
—20,000 tonnes of MRP (landfill)
—13,500 tonnes of Haysom’s (landfill)
3,000tonnes
of dross exported (target)
—100% (24,800 tonnes)of Ouvea stored
in community returned to site
—7,800 tonnes of Ouvea exported
20232024–20302022
REMEDIATION TIMELINE
VERSION THREE – STATUS AS AT 15 MAY 2023
LANDFILLLANDFILL
Closure study for landfill
Commence closure
execution for landfill
Existing landfill volume approx.
807,000m
3
—Ceased depositing any waste in NZAS landfill from May 2022
—Extensive environmental assessments within and around the
landfill including groundwater monitoring, ecological assessments,
water, soil, marine sediment and marine biota sampling
—RAWG work together on the consent
requirements for the existing landfill, with
the initial focus on seeking reuse and recycling
options for material in the landfill to align with
our waste philosophy of reduce, reuse and recycle
Potential landfill materials that
could be reused / recycled:
—Dross residues – c. 33,500 tonnes
—Carbon fines – c. 100,000 tonnes
Reduction of waste
LAND & WATERLAND & WATER
CONTAMINATIONCONTAMINATION
Address possible
contamination sources
Continue progressive
remediation
We have shared
20 yearsof groundwater
monitoring results from the SCL
pad & landfill along with the results
of our Detailed Site Investigation
—Additional five rounds of environmental testing
(based on results of DSI)
—Extensive sampling within the Coastal Marine Environment
—Additional 50 groundwater monitoring bores installed
Actions to prevent further contamination
to soil and groundwater
—B y-products storage facility constructed
—Ceased wet washing of reduction cell shells and superstructures
—Improvements to washdown facility
Commence progressive remediationCommence progressive remediation
—Remediation Advisory Working Group
(RAWG) established with Ng
-
ai Tahu
—RAWG co-design the standard and
criteria for progressive remediation
—Develop the remediation plan for the
first area of land to be remediated
—Develop the remediation plan for the
drain network and assess options for
future open drain design
Further testing to increase
understanding of contamination sites
SPENT CELL LINING (SCL)SPENT CELL LINING (SCL)
—Complete Pre-Feasibility Study for
onsite SCL processing plant
—Continue disposal of SCL through
export pathways
30,000tonnes
of SCL exported (target)
Stored SCL
removed by 2029 (target)
220,000tonnes
of SCL stored on site
(approximately)
—5,500 tonnes of SCL exported
—Sampling/characterisation of SCL pad material
17,000 tonnes
of SCL exported (target)
DROSS RESIDUESDROSS RESIDUES
8,000tonnes
of Ouvea exported (target)
—5,350 tonnes of Ouvea processed and exported
—Commenced recovery and processing of
MRP dross residue (landfill)
—Sampling of Haysom’s dross residue
Stored dross
residues
processed and removed
by 2029 (target)
55,000tonnes of dross
residue to be processed
—21,500 tonnes of Ouvea
—20,000 tonnes of MRP (landfill)
—13,500 tonnes of Haysom’s (landfill)
3,000tonnes
of dross exported (target)
—100% (24,800 tonnes)of Ouvea stored
in community returned to site
—7,800 tonnes of Ouvea exported
20232024–20302022
REMEDIATION TIMELINE
VERSION THREE – STATUS AS AT 15 MAY 2023
LANDFILLLANDFILL
Closure study for landfill
Commence closure
execution for landfill
Existing landfill volume approx.
807,000m
3
—Ceased depositing any waste in NZAS landfill from May 2022
—Extensive environmental assessments within and around the
landfill including groundwater monitoring, ecological assessments,
water, soil, marine sediment and marine biota sampling
—RAWG work together on the consent
requirements for the existing landfill, with
the initial focus on seeking reuse and recycling
options for material in the landfill to align with
our waste philosophy of reduce, reuse and recycle
Potential landfill materials that
could be reused / recycled:
—Dross residues – c. 33,500 tonnes
—Carbon fines – c. 100,000 tonnes
Reduction of waste
LAND & WATERLAND & WATER
CONTAMINATIONCONTAMINATION
Address possible
contamination sources
Continue progressive
remediation
We have shared
20 yearsof groundwater
monitoring results from the SCL
pad & landfill along with the results
of our Detailed Site Investigation
—Additional five rounds of environmental testing
(based on results of DSI)
—Extensive sampling within the Coastal Marine Environment
—Additional 50 groundwater monitoring bores installed
Actions to prevent further contamination
to soil and groundwater
—B y-products storage facility constructed
—Ceased wet washing of reduction cell shells and superstructures
—Improvements to washdown facility
Commence progressive remediationCommence progressive remediation
—Remediation Advisory Working Group
(RAWG) established with Ng
-
ai Tahu
—RAWG co-design the standard and
criteria for progressive remediation
—Develop the remediation plan for the
first area of land to be remediated
—Develop the remediation plan for the
drain network and assess options for
future open drain design
Further testing to increase
understanding of contamination sites
SPENT CELL LINING (SCL)SPENT CELL LINING (SCL)
—Complete Pre-Feasibility Study for
onsite SCL processing plant
—Continue disposal of SCL through
export pathways
30,000tonnes
of SCL exported (target)
Stored SCL
removed by 2029 (target)
220,000tonnes
of SCL stored on site
(approximately)
—5,500 tonnes of SCL exported
—Sampling/characterisation of SCL pad material
17,000 tonnes
of SCL exported (target)
DROSS RESIDUESDROSS RESIDUES
8,000tonnes
of Ouvea exported (target)
—5,350 tonnes of Ouvea processed and exported
—Commenced recovery and processing of
MRP dross residue (landfill)
—Sampling of Haysom’s dross residue
Stored dross
residues
processed and removed
by 2029
(target)
55,000tonnes of dross
residue to be processed
—21,500 tonnes of Ouvea
—20,000 tonnes of MRP (landfill)
—13,500 tonnes of Haysom’s (landfill)
3,000tonnes
of dross exported (target)
—100% (24,800 tonnes)of Ouvea stored
in community returned to site
—7,800 tonnes of Ouvea exported
20232024–20302022
REMEDIATION TIMELINE
VERSION THREE – STATUS AS AT 15 MAY 2023
LANDFILLLANDFILL
Closure study for landfill
Commence closure
execution for landfill
Existing landfill volume approx.
807,000m
3
—Ceased depositing any waste in NZAS landfill from May 2022
—Extensive environmental assessments within and around the
landfill including groundwater monitoring, ecological assessments,
water, soil, marine sediment and marine biota sampling
—RAWG work together on the consent
requirements for the existing landfill, with
the initial focus on seeking reuse and recycling
options for material in the landfill to align with
our waste philosophy of reduce, reuse and recycle
Potential landfill materials that
could be reused / recycled:
—Dross residues – c. 33,500 tonnes
—Carbon fines – c. 100,000 tonnes
Reduction of waste
LAND & WATERLAND & WATER
CONTAMINATIONCONTAMINATION
Address possible
contamination sources
Continue progressive
remediation
We have shared
20 yearsof groundwater
monitoring results from the SCL
pad & landfill along with the results
of our Detailed Site Investigation
—Additional five rounds of environmental testing
(based on results of DSI)
—Extensive sampling within the Coastal Marine Environment
—Additional 50 groundwater monitoring bores installed
Actions to prevent further contamination
to soil and groundwater
—B y-products storage facility constructed
—Ceased wet washing of reduction cell shells and superstructures
—Improvements to washdown facility
Commence progressive remediationCommence progressive remediation
—Remediation Advisory Working Group
(RAWG) established with Ng
-
ai Tahu
—RAWG co-design the standard and
criteria for progressive remediation
—Develop the remediation plan for the
first area of land to be remediated
—Develop the remediation plan for the
drain network and assess options for
future open drain design
Further testing to increase
understanding of contamination sites
SPENT CELL LINING (SCL)SPENT CELL LINING (SCL)
—Complete Pre-Feasibility Study for
onsite SCL processing plant
—Continue disposal of SCL through
export pathways
30,000tonnes
of SCL exported (target)
Stored SCL
removed by 2029 (target)
220,000tonnes
of SCL stored on site
(approximately)
—5,500 tonnes of SCL exported
—Sampling/characterisation of SCL pad material
17,000 tonnes
of SCL exported (target)
DROSS RESIDUESDROSS RESIDUES
8,000tonnes
of Ouvea exported (target)
—5,350 tonnes of Ouvea processed and exported
—Commenced recovery and processing of
MRP dross residue (landfill)
—Sampling of Haysom’s dross residue
Stored dross
residues
processed and removed
by 2029 (target)
55,000tonnes of dross
residue to be processed
—21,500 tonnes of Ouvea
—20,000 tonnes of MRP (landfill)
—13,500 tonnes of Haysom’s (landfill)
3,000tonnes
of dross exported (target)
—100% (24,800 tonnes)of Ouvea stored
in community returned to site
—7,800 tonnes of Ouvea exported
20232024–20302022
REMEDIATION TIMELINE
VERSION THREE – STATUS AS AT 15 MAY 2023
LANDFILLLANDFILL
Closure study for landfill
Commence closure
execution for landfill
Existing landfill volume approx.
807,000m
3
—Ceased depositing any waste in NZAS landfill from May 2022
—Extensive environmental assessments within and around the
landfill including groundwater monitoring, ecological assessments,
water, soil, marine sediment and marine biota sampling
—RAWG work together on the consent
requirements for the existing landfill, with
the initial focus on seeking reuse and recycling
options for material in the landfill to align with
our waste philosophy of reduce, reuse and recycle
Potential landfill materials that
could be reused / recycled:
—Dross residues – c. 33,500 tonnes
—Carbon fines – c. 100,000 tonnes
Reduction of waste
LAND & WATERLAND & WATER
CONTAMINATIONCONTAMINATION
Address possible
contamination sources
Continue progressive
remediation
We have shared
20 yearsof groundwater
monitoring results from the SCL
pad & landfill along with the results
of our Detailed Site Investigation
—Additional five rounds of environmental testing
(based on results of DSI)
—Extensive sampling within the Coastal Marine Environment
—Additional 50 groundwater monitoring bores installed
Actions to prevent further contamination
to soil and groundwater
—B y-products storage facility constructed
—Ceased wet washing of reduction cell shells and superstructures
—Improvements to washdown facility
Commence progressive remediationCommence progressive remediation
—Remediation Advisory Working Group
(RAWG) established with Ng
-
ai Tahu
—RAWG co-design the standard and
criteria for progressive remediation
—Develop the remediation plan for the
first area of land to be remediated
—Develop the remediation plan for the
drain network and assess options for
future open drain design
Further testing to increase
understanding of contamination sites
SPENT CELL LINING (SCL)SPENT CELL LINING (SCL)
—Complete Pre-Feasibility Study for
onsite SCL processing plant
—Continue disposal of SCL through
export pathways
30,000tonnes
of SCL exported (target)
Stored SCL
removed by 2029 (target)
220,000tonnes
of SCL stored on site
(approximately)
—5,500 tonnes of SCL exported
—Sampling/characterisation of SCL pad material
17,000 tonnes
of SCL exported (target)
DROSS RESIDUESDROSS RESIDUES
8,000tonnes
of Ouvea exported (target)
—5,350 tonnes of Ouvea processed and exported
—Commenced recovery and processing of
MRP dross residue (landfill)
—Sampling of Haysom’s dross residue
Stored dross
residues
processed and removed
by 2029
(target)
55,000tonnes of dross
residue to be processed
—21,500 tonnes of Ouvea
—20,000 tonnes of MRP (landfill)
—13,500 tonnes of Haysom’s (landfill)
3,000tonnes
of dross exported (target)
—100% (24,800 tonnes)of Ouvea stored
in community returned to site
—7,800 tonnes of Ouvea exported
20232024–20302022
REMEDIATION TIMELINE
VERSION THREE – STATUS AS AT 15 MAY 2023