Nabberu, Western Australia

The Nabberu project area is located about 200 km NE of Meekatharra in the Murchison Mineral Field of Western Australia (see Figure 1).

DRS has acquired the main Nabberu 01 area (E52/2517) from prospector Mr Drew Money for $30,000, 2 million vendor shares and a 1% NSR royalty. DRS also holds E69/3193, with known kimberlites, in its own right. The diamond rights on adjacent tenements E52/2314 and E69/3196 have been acquired from the unlisted Vanguard Exploration Limited, in return for the non-diamond rights on the DRS properties. Tenure now totals 218 km2 and is listed in Table 1 and shown on Figure 2.

The Nabberu area contains several untested or poorly tested diamondiferous kimberlites with known pink diamonds (Figures 3 & 4).

After preliminary geological work, DRS plans to undertake a bulk sampling program with the intention of locating commercial grades of diamondiferous kimberlite.

Following regional stream sampling and aerial surveys, the Nabberu 01 kimberlite area was discovered by De Beers in late 1990. De Beers carried out a successful exploration program which discovered 15 separate kimberlites. However, they ceased exploration leaving untested targets in 1996 when De Beers terminated all their exploration activities in Australia. General views of the Nabberu project area are shown in Figures 5, 6 & 7.

Diamond Resources has collected a number of small (around 2kg) test samples around the collars of the previous De Beers drillholes (e.g. see Figure 7). The aim is to obtain representative kimberlite indicator grains from the different kimberlite intrusions in the Nabberu 01 area to determine priority for later work. All eight samples to date have provided varying numbers of kimberlitic chromites with the chemistry of some plotting in the field normally associated with diamonds. This provides a way of determining which kimberlites are more likely to contain higher diamond concentrations.

Five of these small samples from around previous drillholes have also been examined for microdiamonds. One sample has already producing two microdiamonds from a 2.67kg sample of old drill debris left from the previous core drilling. Further testing will be completed on the recovered microdiamonds and chromites.

The original aerial magnetic survey with wide line spacing defined a target anomaly which was not a kimberlite but did lead to sampling which discovered kimberlite at that site. Recent work by Diamond Resources (see Figures 8 & 9) has shown that the Nabberu 01 kimberlites can be seen in modern high resolution magnetics enabling better mapping of outcrops below the thin soils.

In the Nabberu 01 Target area there are over 15 separate known kimberlite outcrops comprising at least 21 different kimberlite phases. Two separate outcrop areas within Nabberu 01 area have been confirmed as diamondiferous. However, only half of the mapped Nabberu 01 kimberlite outcrops have been drilled, and only one site has been bulk sampled. This would imply that the testing has been extremely limited for many of the kimberlite phases.

Within the greater Nabberu Province area there are over 21 separate kimberlite occurrences with at least three confirmed as diamondiferous. Diamond Resources Ltd now controls the diamond rights for four Exploration Licences covering 218 square kilometres over the Nabberu Kimberlite Province (Figure 2). Similar to the Nabberu 01 local area, many of the kimberlites are multiple bodies and historical activity varied considerably in the effectiveness of testing for diamonds. This has led to DRS’ opportunity to explore each known intrusion more closely.

Since De Beers ceased diamond exploration in this area in 1996, there has been little effective modern diamond exploration in the region. Diamond Resources now intends to apply modern geophysics and sampling to these exciting kimberlites to determine their full economic potential.

Figure 1 Regional location of the Nabberu Project

Table 1 Diamond Resources' tenement holdings for the Nabberu Project

Figure 2 Kimberlite and diamond locations at Nabberu

Figure 3 Diamonds in the 1 to 3 mm size range from Stockdale’s 1993 bulk sampling at Nabberu 01. Photos kindly made available by Cyril Geach who was loaned the diamonds for scientific research by De Beers Australia.

Figure 5 Access track to Nabberu 01 kimberlite area in September 2013.

Figure 4 Percentage of different colours from Nabberu diamonds.

Figure 6 Nabberu 01 kimberlite area showing little surface outcrop – scrape from previous loam sampling.

Figure 7 July 2014 DRS sampling of kimberlite debris around a previous De Beers drillhole at Nabberu.

Figure 8 Steven Cooper collecting ground magnetic data at Nabberu in September 2013.

Figure 9 Nabberu ground magnetics image showing kimberlite locations from DRS September 2013 survey.