Report on blocks relinquished at the conclusion of year 5 for EL 23771 Cox River West, period ending 18 August 2008

Abstract

During the first year of tenure, on the basis of encouraging diamond sampling data from nearby tenements, a Falcon airborne gravity gradiometer survey was flown over a substantial part of the Cox River West tenement and also over neighbouring tenements. Detailed interpretation, anomaly ranking and exploration targeting from the Falcon survey by Gravity Diamonds was completed, however no priority targets were identified within EL 23771 but targets in adjacent EL's currently being explored by Gravity were rated highly with the possibility of kimberlite pipes or alluvial diamonds occurring on EL 23771 being highlighted. Helicopter-supported heavy mineral sampling was carried out on ELs adjacent to EL 23771 focused on priority Falcon target areas and field reconnaissance was carried out at this time on EL 23771 but no appropriate sample sites were located. Reprocessing of the original Falcon gravity data was carried out by BHPB Falcon operation with updated noise suppression algorithms that lowered the noise in the original data set from approximately 10 Eotvos to 3 Eotvos. Small kimberlites discovered by Gravity Diamond at Abner Range had a negative gravity response of 22 Eotvos. Assessment of the relinquished blocks again indicated that the potential of the relinquished blocks to provide adequate sample sites to assess drainages from the east and west of the tenement was limited and they were recommended for relinquishment.