Technical Report: Saxendrift & South Bank Middle Orange River Operations Alluvial Diamond Property February 2009

Saxendrift is adjacent to Wouterspan, which is located on the north bank of the Middle Orange River. The proximity of these projects offers Rockwell the opportunity to maximize existing infrastructure and operational synergies.

Rockwell acquired the property in April 2008 and initiated processing by re-commissioning an existing 35 tonne per hour Dense Media Separation Plant ("DMS"); repairing and re-commissioning the gravel screening and rotary-pan plants (including three 16-foot and one 14-foot rotary-pans) located near the north-eastern margin of the Saxendrift terrace.

A new wet rotary pan plant, which has design plant throughput of 800 tonne per hour, was built and commissioned in November 2008. This new wet plant includes high volume trommel screening units; four scrubbers feeding four 18-foot rotary-pan plants; puddle-density control systems, cyclone de-sanding, and a water reticulation system; a refurbished X-ray flowsort system; and a hands-off final recovery system.

An estimated inferred resource* of 4,358,143 cubic metres (m3) at a grade of 0.72 carats/100 m3 and indicated resource* of 5,063,099 cubic metres (m3) of diamondiferous gravel at a grade of 1.01 carats/100 m3 was updated in February 2009.

For Financial Year 2009 the average diamond sales value achieved for Saxendrift is US$1,766 per carat.

Click To Enlarge

^*Dr. Tania R. Marshall, Pr.Sci.Nat. was the qualified person responsible for the updated resource estimate