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Nautilus Minerals Inc ("Nautilus") is following the lead by the petroleum industry to tap vast offshore resources and is planning to extract high-grade Seafloor Massive Sulphide ("SMS") deposits of copper, gold, zinc and silver.
Planning is underway for the world's first seafloor copper-gold site in approximately 1,600 metres of water at the Solwara 1 Project in the Bismarck Sea, New Ireland Province of Papua New Guinea.
The Company holds more than 528,000 km2 of tenement licences and exploration applications in the exclusive economic zones and territorial waters of Papua New Guinea, Fiji, Tonga, the Solomon Islands and New Zealand along the western Pacific Ocean's Rim of Fire.
Listed on the Toronto (TSX) and London (AIM) exchanges, Nautilus has among its cornerstone shareholders three of the world's largest resource companies and its alliances and technical partnerships position it as the world leader in deep-water exploration of SMS deposits.
Solwara Project - Gold and Base Metals
DELIVERING OPERATIONS ON TIME AND WITHIN BUDGET
Combining skills from onshore mining, dredging and deepwater construction, our engineering team has scoped out the three main components of the production system, which are the:
Seafloor Mining Tool;
Riser and Lifting System; and
Production Support Vessel.
The first step in the extraction process involves cutting the seafloor material and drawing it into the suction mouth of the Seafloor Mining Tool (SMT) as slurry. It is then transported to a pumping module and lifted up a steel riser pipe to the Production Support Vessel (PSV) on the surface where the material is dewatered. After dewatering, the ore is transferred to barges on a continuous cycle for shipment to a nearby port facility.
Engineering work for the project is ongoing in 2009
METALLURGY
Results from mineralogical and metallurgical investigations of ore concluded that a highly marketable copper concentrate with grades of better than 28% copper can be produced using standard froth flotation techniques with copper recoveries of more than 85%. Additionally the low bond work index, indicates the potential low capital and operating cost for treatment of Solwara 1 ore.
Analysis was completed on 10 composite samples recovered from 1.2 tonnes of Solwara 1 drill core collected during the 2007 drilling campaign at the Company's Solwara 1 Project, located in the territorial waters of Papua New Guinea ("PNG"), as documented in the Resource Report completed by Golder Associates Pty Ltd. Testing indicated that over 95% of the copper occurs as the mineral chalcopyrite The chalcopyrite is coarse-grained and can be liberated from the gangue with high recovery to produce a marketable concentrate.
Grinding and flotation tests indicate effective liberation with a likely primary grind size of 80% - 55 micron and regrind size of 80% -25 microns. Comminution data tabulated indicates that the ore has an average Bond Ball Mill Work Index of about 11 kWh/t. The copper concentrates contain significant gold contents and in some cases payable levels of silver. Greater than 90% of the gold reports to sulphides either to a copper or a pyrite concentrate. Further work defining gold and silver deportment is in progress. (May 23, 2008)
Golder Associates SMS NI43-101 compliant resource estimate for Solwara 1.
• Indicated Mineral Resource: 870kt @ 6.8% Cu, 4.8g/t Au, 23g/t Ag, 0.4% Zn
• Inferred Mineral Resource: 1,300kt @ 7.5% Cu, 7.2g/t Au, 37g/t Ag, 0.8% Zn
The resource was open to the west and at a depth where 38% of holes finished in mineralisation. The area drilled in 2007 was constrained by the vessel contract term and the depth limitations of the new Remote Operated Vehicle drill rigs. Currently Nautilus is working with its partners to extend the depth capacity for 2010.
ON-GOING PROJECT DEVELOPMENT WORK
In addition to the engineering work, the Project Development team continues its work on mine planning, materials handling, shipping, metallurgical testing and processing studies.
Western Pacific
| Directors |
| A. Geoffrey Loudon (Chairman and Non-Executive Director) |
| Stephen Rogers (President, Chief Executive Officer and Executive Director) |
| David De Witt (Non-Executive Director) |
| Russell Debney (Non-Executive Director) |
| A. Farhad Moshiri (Non-Executive Director) |
| John O'Reilly (Non-Executive Director) |
| Management |
| Anthony O'Sullivan (Chief Operating Officer) |
| Shontel Norgate (Chief Financial Officer) |
| Michael Johnston (Vice-President Strategic Development) |
| Scott Trebilcock (Vice-President Business Development and Investor Relations) |
| Glen Smith (Chief Technology Officer) |
| Mel Togolo (PNG Country Manager) |
| Paul Tamoepeau (Tonga Country Manager) |
Company AddressCorporate Office
|
Additional Address/Key ContactProject Office (Brisbane, Australia) |
CapitalCommon Shares;155,558,884
|
Nominated BrokersNumis Securities Limited | Nominated AdvisorsNumis Securities Limited |
| Gazmetall Hiolding (Cypruss) Limited | 21.0% |
| Teck Resources | 6.8% |
| Anglo American plc | 11.1% |