Relinquishment report on blocks dropped at the conclusion of year five of tenure for EL 7970 'Arnold River', period ending 23 July 2005

Abstract

EL 7970 forms part of Rio Tinto's 'Hodgson Diamond Project' and is centred approximately 150 km northeast of Daly Waters in the Northern Territory, within the Hodgson Downs 1:250,000 map sheet. The EL was granted to Ashton Mining on 24th July 2000. Ashton Mining Ltd was taken over by Rio Tinto Limited in the 4th quarter of 2000. The tenement forms part of a farmin agreement between Rio Tinto Exploration Pty Ltd ('Rio Tinto') and Diamond Mines Australia Pty Ltd ('DMA') covering numerous Rio Tinto tenements and applications in the Northern Territory. Under this agreement, DMA is conducting predominantly diamond exploration utilising the newly-developed Falcon(tm) airborne gravity gradiometer system. The Falcon(tm) system has been shown to be effective in detecting kimberlite pipes. Gravity Diamonds Ltd is managing the farmin arrangement for Diamond Mines Australia and owns 100% of DMA. The tenement is considered prospective for commercial sources of diamonds. Historic gravel sampling shows that there are unresolved chromite and diamond occurrences in an area of Bukalara Sandstone on EL 7970. During the initial year of the Rio Tinto-DMA farmin arrangement, a review of historic exploration data was conducted by Gravity. On this basis, a Falcon(tm) survey was planned to cover prospective areas within EL 7970 and adjacent farmin tenements to the east. The survey was conducted in August - September 2003 and results were received by Gravity in November 2003. Interpretation and exploration targeting from the Falcon(tm) data was completed during 2004, with target areas defined for follow-up work. Statutory requirements for clear access to target areas were completed in February 2005 and field testing of these targets commenced during the 2005 field season. This Report is in respect of the one hundred and three (103) blocks relinquished from EL 7970 at the conclusion of Year 5. No work was carried out within the relinquished portion of EL 7970 as the Falcon(tm) survey flown in 2003 did not extend to the relinquished blocks.