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Significant High-Grade Copper and Gold Deposit at Solwara 1 Confirmed by Drill Assay Results

Tuesday, September 25th, 2007

Nautilus Minerals Inc. announces that it has received high-grade Copper (“Cu”) and Gold (“Au”) assays over significant widths from this year’s drilling program at its Solwara 1 prospect located in the territorial waters of Papua New Guinea (“PNG”). Selected intercepts from the Solwara 1 drilling program are listed in Table 1 below.
Table 1 Solwara 1 Drilling – Selected Intercepts
Hole, Massive Sulphide Intercepts-Interval m, Cu %, Au g/t, Pb %, Zn %, XRF* Cu %, Hole Depth m, From m, To m
SD038 5.9 15.3 11.7 0.1 0.7 10.2 13.6 1.1 7.0
SD042 6.2 12.2 12.9 0.1 0.2 8.1 8.9 0.0 6.2
SD047 9.3 11.0 6.3 0.0 0.1 4.6 9.5 0.3 9.5
SD052 7.8 11.8 15.1 0.1 0.2 12.0 16.7 0.3 8.1
SD056 18.9 5.0 3.4 0.1 0.4 4.7 18.9 0.0 18.9
Hole ended in mineralisation
SD063 6.9 10.1 7.4 0.1 0.1 6.9 11.9 0.8 7.7
SD064 13.7 8.5 8.4 0.1 0.5 9.6 19.5 0.4 14.1
SD065 8.1 14.8 8.4 0.0 0.1 13.5 9.6 0.2 8.3
SD072 6.5 13.4 9.4 0.0 0.0 12.2 15.1 1.7 8.2
*XRF Cu results are the results from hand XRF instrument reported previously.
David Heydon, Nautilus CEO, commented: “These results confirm that there is a significant high-grade copper and gold deposit at Solwara 1. Results to date have returned 36 mineralised intercepts from 44 holes with spectacular intercepts like hole SD 052 with 7.8 metres at 11.8% Cu and 15.1 g/t Au, and hole SD065 with 8.1m at 14.8% Cu and 8.4 g/t Au.”
“These outstanding results demonstrate that the high grades returned from 146 surface samples at Solwara 1 averaging 11.3% Cu and 15.2 g/t Au continue at depth with holes intersecting up to 19m (open at depth) high-grade massive sulphide mineralisation. Of the 36 sulphide intercepts reported today, 18 of them remain open at depth. The results also show remarkable consistency of the Cu and Au grades within the mineralised massive sulphide zones: It is rare to see an assay below 2% Cu within the mineralised zones.”
“It is particularly encouraging that the first prospect that we have evaluated, Solwara 1, has returned such encouraging grades over such thicknesses. There are a further seven systems that we have already identified in Nautilus’ exploration licences in PNG, four of which we discovered in four weeks target testing this year. We are currently planning the next program with the aim of extending this prospect inventory further.”
A total of 107 holes were drilled during the program this year over the Solwara 1 Prospect. All samples have been despatched for analysis.
For further information visit: (http://www.nautilusminerals.com/i/misc/Solwara-1_2007-Holes_Sep07.jpg).

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