Poseidon

Nautilus Minerals discovered two new high-grade seafloor massive sulphide systems in Tonga's NE Lau basin, with samples assaying up to 11.9% copper, 59.8% zinc, 28.6 g/t gold and 673 g/t silver.

Nautilus Minerals has appointed Mike Johnston as interim president and CEO, effective immediately, replacing Steve Rogers.

Nautilus Minerals Inc. granted 225,000 stock options and issued 3.8 million loan shares to employees and its executive director under its incentive plans.

Nautilus Minerals granted 900,000 options and issued 200,000 loan shares to non-executive directors as full 2012 remuneration.

Nautilus Minerals' subsidiary Tonga Offshore Mining released an independent NI 43-101 technical report containing a maiden mineral resource estimate for its Clarion-Clipperton Fracture zone polymetallic nodule project.

Tonga Offshore Mining Ltd. reported a maiden inferred mineral resource of 410 million tonnes of polymetallic nodules in the Clarion-Clipperton Zone, estimated by Golder Associates.