© Nautilus 2008 1

TSX : NUS

AIM : NUSSeptember 2008

NAUTILUS MINERALS INC.

© Nautilus 2008

© Nautilus 2008

FORWARD LOOKING STATEMENTS

This presentation includes certain �forward-looking statements.�

All statements, other than statements of historical fact, are forward-looking statements that involve various risks and uncertainties. There can be no assurances that such statements will prove accurate and actual results and future events could differ materially from those anticipated in such statements.

Such information contained herein represents management's best judgment as of the date hereof based on information currently available. The company does not assume the obligation to update any forward-looking statement.

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© Nautilus 2008

DISCLAIMER AND LEGAL NOTICE

Nautilus Minerals Inc. ("Nautilus", "The Company"), all rights reserved. "Nautilus Minerals" and all logos used in this presentation are trademarks of Nautilus, unless otherwise noted. Nautilus ® is a Registered Trade Mark. All graphics, effects, processes, information and data features in this presentation are owned or used under license by Nautilus, and public access is permitted for lawful personal information purposes only. Any use for any unlawful purpose, and any reproduction or dissemination, of any feature of this presentation in whole or in part, is strictly prohibited.

No information in this presentation shall constitute an invitation to invest in Nautilus or any entities of the Nautilus Group. Neither Nautilus, nor the entities of the Nautilus Group, nor their respective officers, employees or agents, shall be liable for any loss, damage or expense however caused (including through negligence) which you may directly or indirectly suffer in connection with this presentation including, without limitation, any loss or profit, indirect, incidental or consequential loss. An offer to sell, or a solicitation of an offer to buy, securities of the Company can only be made by a broker registered in all jurisdictions in which such offer is being made, and only if such offer is otherwise made in accordance with all applicable securities laws, regulations and rules of any kind whatsoever.

Nautilus shall not be responsible for any special, indirect, incidental or consequential damages that may arise from the use of the information from this presentation, irrespective of whether the information is provided by Nautilus.

While efforts are made to keep the information in this presentation accurate and timely, neither Nautilus nor any of the entities of the Nautilus Group guarantee or endorse the content, accuracy or completeness of the information herein. The information within thispresentation is provided in good faith on an "as is" basis, without representations or warranties of any kind, whether express or implied. For current information, contact Nautilus by e-mail (investor@nautilusminerals.com).

This information has been prepared to provide you with general information only. It is not intended to take the place of professional advice and you should not take action on specific issues in reliance on this information. In preparing this information, we did not take into account the investment objectives, financial situation or particular needs of any particular person. Should you wish to make anyinvestment decision, you need to consider (with or without the assistance of an adviser) whether this information is appropriate to your needs, objectives and circumstances.

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© Nautilus 2008

NAUTILUS SUMMARY

WELL FUNDED

� US$298 million in cash* (US$2.04 per share)

MASSIVE EXPLORATION UPSIDE

� 521,000 km2 exploration tenements

� Large known mineral belts

� High-grade copper, gold and zinc

NEAR TERM PRODUCTION

� Target production Q4, 2010 subject to timely permitting

� Compressed development time line � no pre strip or shaft

* As of June 30, 2008

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© Nautilus 2008

WORLD CLASS PARTNERS AND INVESTORS

22.4% US$109 MM 40% Russia�s Iron ore production

7.2% US$25 MM

+ US$12 MM option payment right to JV

+ US$15 MM warrant exercise @ US$5

5.7% US$25 MM

Gazmetall

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© Nautilus 2008

SEAFLOOR �EEZ� RESOURCE RIGHTS(Updated 2007 from Fouquet, IFREMER, 2002)

© Nautilus 2008

SEAFLOOR MASSIVE SULPHIDE (�SMS�) DEPOSITS

Initiation of hydrothermal discharge and chimney growth

Seafloor sulphide chimney

Collapse of old chimney and growth of new chimneys

Decrease of mound permeability and intra-mound sulphide precipitation, replacement and remobilisation

Growth of mineral sulphide mound by accumulation of chimney talus and defocusing of hydrothermal discharge

Seafloor massive sulphide mound

© Nautilus 2008

VOLCANIC MASSIVE SULPHIDE (�VMS�) DEPOSITS IN NORTH AMERICA

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909mt105mt

270mt

77mt

97mt

516mt

12mt

640mt

� What if you could add up all VMS deposits in Canada?

� 85% Uneconomic

These deposits formed on SEAFLOOR

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© Nautilus 2008

New Vision � New World � New Resources

� First mover advantage

� Emerging producer-start up planned 2010 (subject to timely permitting)

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© Nautilus 2008

IT HAS BEEN DONE BEFORE!

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© Nautilus 2008

EXPLORATION � THE CHALLENGE FOR THE MINING INDUSTRY

� Most belts are maturing

� Rate of discovery is dropping

� Av. discovery costs are rising

� Quality acreage is very hard to find

� Acquisitions � commonly destroy value for acquirers

© Nautilus 2008

EXPLORE

THE �TOOL KIT�

© Nautilus 2008

ONTONG � JAVAPLATEAU

PACIFIC PLATE

AUSTRALIAN PLATE

CAROLINE PLATE

North Fiji Basin

South FijiBasin

LauBasin

NEW ZEALAND

FIJI

PAPUA NEW GUINEA

AUSTRALIA

EXPLORE

© Nautilus 2008

WHERE TO EXPLORE THE ADVANTAGES OF SMS MINING

EXPLORE

Regional earthquake centres from USGS Database colour coded by depthYellow triangles � active volcanoes 3D modelling of earthquake data

© Nautilus 2008

EXPLORE

LOCATION OF TENEMENTS

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© Nautilus 2008

EXPLORE

SOLWARA 1 � UNDER DEVELOPMENT

Solwara 1

� Territorial waters of PNG

� 100% Nautilus owned

� Sheltered quiescent ocean

� 10 systems found to date

� >190km2 of exploration ground

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© Nautilus 2008

GROWING PIPELINE OF HIGH GRADE PROSPECTS IN PNG

EXPLORE

Prospect Cu % * Zn %* Au g/t* Comments

Solwara 1 7.2 0.6 6.2 NI 43-101 indicated and inferred resource

Solwara 2 1.2 22.1 10.3 68 samples with Solwara 3

Solwara 3 1.2 22.1 10.3 68 samples with Solwara 2

Solwara 4 12.0 23.8 13.2 34 samples

Solwara 5 6.7 7.8 17.4 13 samples

Solwara 6 14.4 18.7 18.1 4 samples

Solwara 7 5.9 24.1 17.1 7 samples

Solwara 8 6.1 32.5 16.9 12 samples

Solwara 9a 4.7 11.6 TBD 8 samples; currently XRF only

Solwara 9b 8.1 9.2 TBD 9 samples; currently XRF only

Solwara 10 5.2 11.5 TBD 13 samples; currently XRF only

* All grab samples lab assayed except Solwara 9 +10; see details in associated press releases

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© Nautilus 2008

EXPLORE2008 EXPLORATION PROGRAMS >US$32MM IN PNG AND TONGA

Nautilus Minerals� PNG & Tonga >$20MM program� Opened Tongan office� 165+ days w/ new EM and ROVdrill tools� Exploration and environmental programs

Teck Cominco�Commenced a US$12 million program on Nautilus 100% owned tenements�Opened Brisbane project office (12 staff)��Fantastic results !�

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© Nautilus 2008

TECK COMINCO ON NAUTILUS GROUND IN TONGA

Tonga TenementsProspect Sample No. Au (g/t) Cu (%) Zn (%) Ag (g/t)

MAKA NEL1002 8.46 10.6 8.39 109

MAKA NEL1003 4.69 1.66 7.28 53

MAKA NEL1004 0.76 3.81 2.44 25TUNU-SOSISI NEL1009 29.9 4.69 3.03 194TUNU-SOSISI NEL1010 14.05 15.9 0.55 48TUNU -SOSISI NEL1011 16.4 7.36 26.4 211TUNU -SOSISI NEL1012 7.69 24.8 10.25 300TUNU -SOSISI NEL1013 33.4 18.75 0.56 113

PIA NEL1014 29 0.78 27.4 277PIA NEL1015 24.8 4.52 14.65 229

PIA NEL1017 28.9 0.29 22.6 221

PIA NEL1018 13 0.44 14.7 90PIA NEL1019 14.25 6.52 14.65 165

PIA NEL1020 13.75 15.2 11.6 162

NIUA_2 NEL1024 10.75 18.5 13.15 363NIUA _3 NEL1025 14.15 1.24 19.2 274

NIUA _3 NEL1026 16.15 4.43 13.65 302

Min 0.76 0.29 0.55 25Max 28.9 24.8 26.4 302

Average 16.4 8.2 12.3 184� 4 new systems in 9 days

� Nautilus has 35-40 days planned on the water in Tonga !

EXPLORE

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© Nautilus 2008

EXPLORE

NAUTILUS 2008 TONGA PROGRAM

� 35 to 40 days planned

� Number of known systems

� Great potential for new discoveries

© Nautilus 2008

DELIVER SOLWARA 1PROVEN HIGH GRADE RESOURCE

� Resource open to the west and at depth

38% holes ended in mineralisation

Inferred Mineral Resource*: 1,300 kt @ 7.5% Cu, 7.2 g/t Au, 37 g/t Ag, 0.8% Zn

Indicated Mineral Resource*: 870 kt @ 6.8% Cu, 4.8 g/t Au, 23 g/t Ag, 0.4% Zn

* Golder Associates Ltd Pty completed resource estimate

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© Nautilus 2008

DELIVER SOLWARA 1FOCUSED ON PRODUCTION BY 2010

2008 2009 2010

Design and Construction

Equipment Deliveryand Production

Readiness Production

�Exploration work in PNG, Tonga and potentially by Teck Cominco to increase pipeline of opportunities

�Continue increasing tenement holdings

�Construction of mining system equipment

�More exploration work in PNG, Tonga and other countries

�Continue increasing tenement holdings

�Obtain all necessary permits, licenses and mining lease

�Fabrication and integration

�Further develop pipeline of opportunity at other prospects

�Complete integration of mining equipment and vessel

�Begin commissioning of offshore production facilities

�Bring Solwara 1 into full production

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© Nautilus 2008

FIVE+ ADVANTAGES TO SEAFLOOR MINING

Limited social disturbance

Minimal mining infrastructure

Minimal overburdenor stripping

Minimal mining waste

Increased worker safety

DELIVER SOLWARA 1

From 2006 Annual Report

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© Nautilus 2008

EXTENSIVE 3 YEAR ENVIRONMENTAL IMPACT STUDY ON TRACK

DELIVER SOLWARA 1

� Environmental Impact Statement (EIS) nearing completion

� Involves world leading scientists

� Submission Q3 2008

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© Nautilus 2008

DELIVER SOLWARA 1PHASE 1 DEVELOP AND COMMISSION

MINING SYSTEM � DIRECT SHIP ORE

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Treatment Facility (Phase 2)

Product to Market

On-Shore Storage

OFF-SHORE ON-SHORE

Ore Barged to Shore

© Nautilus 2008

DELIVER SOLWARA 1SEAFLOOR MINING TOOL CONTRACT

� £33 million contract for 2 machines (100% redundancy)

� Peak production 6,000 tonnes/day

� Design based on seafloor pipeline trenching equipment

� Cutting/gathering trials in progress

� Assembly and testing in 2009

� Multiple cutting heads

� Interchangeable walking and tracked

15m long x 13m wide x 8m high

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© Nautilus 2008

RISER AND LIFTING SYSTEM (RALS) CONTRACT

DELIVER SOLWARA 1

� Awarded a US$116 million target price EPCM contract to Technip USA

� World leaders in their field

� Majority of equipment provided on a fixed pricebasis by oilfield equipment specialists

� Riser handling equipment is off the shelf

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© Nautilus 2008

DELIVER SOLWARA 1MINING SUPPORT VESSEL CONTRACT

� North Sea Shipping Holding AS

� Five year charter basis with options to extend for another five years (OPEX)

� Ideal vessel for seafloor mining

� Under construction at RMK Marine (Turkey)

� Outfitting at Barreras (Spain)

Key Vessel Specifications� 21 MW � meets all power needs

� 400 tonne seafloor crane

� 160m long dynamically positioned

� Sufficient strength and space to accommodate mining equipment

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© Nautilus 2008

DELIVER SOLWARA 1

MINE TRANSPORT

Barge fleet loaded alongside MSV

Solwara 1

Barging 60 km to Port of Rabaul

Existing deep waters berths at Rabaul for handy sized shipment to market

Port of Rabaul

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© Nautilus 2008

STRATEGIC SHAREHOLDERS CONTINUE TO BUY-IN AT MARKET PREMIUM

AIM & NA Placement:

$4.30RTO: $2

May 2006ABCPCrisis

Teck$5.00

Gazmetall $3.60

Anglo:$3.37

Teck $3.76

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Current$1.60

� 147 million shares outstanding

� $298 million in cash as of June 30, 2008

TRADING BELOW CASH VALUE$2.04 / share

Risk Reduction

© Nautilus 2008

A NEW INDUSTRY, NOT JUST A NEW MINE

nautilusminerals.comTSX & AIM : NUS

Mike Johnstonmdj@nautilusminerals.com

Scott Trebilcocksat@nautilusminerals.com

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