June 04, 2007 Rockwell Drilling Discovers Extension To Diamond Host Unit At Its Klipdam Alluvial Diamond Mine
June 4, 2007, Vancouver, BC -- Rockwell Diamonds Inc. ("Rockwell" or the "Company") (TSXV: RDI; OTCBB: RDIAF) announces that it has completed the first phase of a reverse circulation drilling program on the Klipdam palaeochannel at its Klipdam Mine north of Kimberley in South Africa. This program is in line with Rockwell's objective to expand and optimise its existing mining operations by increasing production and further evaluating and expanding the resource base at its Holpan-Klipdam, Wouterspan, and Makoenskloof properties.
The Klipdam palaeochannel is one of the two main host units of diamonds that are currently being mined at the Klipdam property. The extensive Rooikoppie gravels are also mined on the property. A total of 238 Reverse Circulation ("RC") boreholes (totalling 2,214 metres) were drilled along the northwest flank and at the northern end of the Klipdam palaeochannel. This palaeochannel trends northeast--southwest across the Klipdam property and is approximately 1.9 kilometers in length and roughly 450 metres across at its widest point.
This work was carried out using a new RC rig which has been built for the purpose of evaluating the alluvial geology encountered throughout the Rockwell properties. The drill is currently contracted to the Company and a second rig is available on demand. A photograph of the new rig is included in hard copies versions of this release, or can be viewed on the Company's website.
The RC program comprised drilling of holes at 100 metre x 50 metre intervals and extending down to bedrock. The program was designed to more fully delineate and define the northwestern and northern boundaries and possible extensions of the Klipdam palaoechannel. The drilling program has shown that the gravel sequence preserved in the palaeochannel extends further to the northwest than previously outlined and is also thicker along the northwest margin than originally estimated from percussion drilling results, thereby adding additional volumes of diamond bearing gravel inventory at Klipdam.
The drill results are being incorporated into a Paradox database and will be modelled in Surpac 3D mine planning and modelling software. Results from this modelling will be incorporated into a revised estimate for the Klipdam and Holpan resource statement, which is currently the focus of work by an independent Qualified Person. The revised resource statement will also form an important part of the Company's revised 5 year mining plan for Klipdam, thereby allowing Rockwell to optimize the efficiencies of the fleet assigned to mining of both the Klipdam palaeochannel and the surrounding Rooikoppie gravels, which also host the diamond deposits at Klipdam.
The RC drill has subsequently been relocated to the Wouterspan Mine to facilitate the upgrading of the extensive alluvial diamond gravel sequence on Wouterspan. The Wouterspan program is designed to upgrade the Wouterspan material to inferred and indicated resource categories where appropriate.
President and COO John Bristow commented that: "We have embarked on a RC drilling program to improve our understanding of the alluvial gravel deposits on all of our properties, and to add new resources. These positive results for Klipdam are most encouraging".
Glenn Norton, Pr.Sci.Nat, a Qualified Person, has reviewed this news release and supervised the preparation of the scientific or technical information that forms the basis of this news release.
For further details on Rockwell Diamonds Inc., please visit the Company's website at www.rockwelldiamonds.com or contact Investor Services at (604) 684-6365 or within North America at 1-800-667-2114.
John Bristow President and COO
Rockwell's reverse circulation rig is shown drilling at the Klipdam site. The RC rig was built for testing alluvial gravels at Rockwell's growing number of projects in South Africa.