Rockwell Pre-Commissioning New Saxendrift Diamond Recovery Facility Ahead of Schedule

Rockwell Pre-Commissioning New Saxendrift Diamond Recovery Facility Ahead of Schedule

Rockwell Diamonds Inc. announces that it has commenced with full scale pre-commissioning trials of its new final recovery facility at Saxendrift well ahead of the originally scheduled date of October 10, 2008.

This facility comprises a large custom built vertical steel structure located immediately adjacent to the new high volume Saxendrift wet Rotary-pan plant that is in the final stages of construction. This diamond recovery facility was constructed by the previous owner and has been reconfigured and modernized as an integral part of the new Saxendrift wet plant diamond processing and recovery facility.

The facility incorporates seven, flow-sort X-ray recovery machines (wet X-ray technology), a state of the art optical sort machine, hands-off diamond recovery units with built in secure storage capability, and integrated CCTV and security monitoring facilities. All of these components are configured and housed in an easily maintained modern layout. The flow sort X-ray recovery units are configured to process and recover diamonds in the size fraction +2 mm to 32 mm at a high level of throughput and efficiency. The flow sort units will recover diamonds of up to about 210 carats in size.

To enhance the process efficiency of this new facility and to ensure that larger diamonds in the size fraction up to 70 mm will also be recovered, an optical sort machine has been introduced into the design of the Saxendrift final recovery facility. This unit will accommodate the size fraction +32 mm to 70 mm and allow recovery of considerably larger stones up to about 500 carats.

A review of historical data for the lower Vaal (including the Company’s Holpan and Klipdam mines) and Middle Orange River has shown that diamonds of up to about 400 carats have been recovered from alluvial deposits in this setting. The machine has been commissioned successfully.

The throughput and mass balance of the new facility as currently configured has been designed with an overall treatment capacity of about 20 tons per hour. This will ensure that the facility is able to treat and recover diamonds from concentrate produced by the new Saxendrift mining operation when at its full capacity. The structure also has space and support infrastructure (e.g. electrical power and water) to increase the production capacity of this modern facility by adding additional X-ray flow sort equipment thereby allowing for further expansion at Saxendrift, or processing of concentrate from other of the Company’s Middle Orange River sites.

To improve the functionality and steady state performance of the Recovery plant, and in particular the optical sort system, the computer control software has been upgraded to ensure robust steady-state operational conditions and rapid problem solving.

President and CEO John Bristow commented “Our Project Team, led by Hennie van Wyk, has done a great job in completing and initiating pre-commissioning of the new final-recovery facility some three weeks ahead of schedule. The greater efficiency and inclusion of an optical sort machine that, for the first time in the South African alluvial diamond sector, will enable recovery of diamonds larger than 200 carats and modern layout of this facility will provide enhanced recovery and lower operating costs. Much of the innovation made in this facility is driven by the many years of practical hands-on experience that Hennie van Wyk and his Team accumulated while building a successful alluvial diamond business.”

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