Holpan-Klipdamholpan-Klipdam NN O P O P Botswana Im L

Corporate Presentation Dr John Bristow

March 2008 TSX:RDI JSE:RDI OCTBB:RDIAF Disclaimer…

This presentation includes certain statements and other information that may be deemed "forward-looking". Other than statements of historical fact all statements in this presentation that address future production, resource potential, exploration drilling, exploitation activities and events or developments that the Company expects are forward-looking statements. Although the Company believes the expectations expressed in such forward-looking statements are based on reasonable assumptions, such statements are not guarantees of future performance and actual results or developments may differ materially from those in the forward-looking statements. Factors that could cause actual results to differ materially from those in forward-looking statements include market prices, exploitation and exploration successes, availability of capital and financing, and general economic, market or business conditions. Investors are cautioned that any such statements are not guarantees of future performance and that actual results or developments may differ materially from those projected in the forward-looking statements. For more information on Rockwell, Investors should review Rockwell’s annual Form 20-F filing with the United States Securities and Exchange Commission www.sec.com and the Company's home jurisdiction filings that are available at www.sedar.com.

2 High value producer… Selected examples Jan 2007 -> present

58 carats 110 carats 212 carats D colour I/J colour stone Yellow US$1.55M US$ 555,555 US$2.44M (US$26,676/carat) (US$5,000/carat) (US$11,500/carat)

72.58 carats 96.33 carats Fancy Yellow Fancy Yellow US$919,880 US$950,000 (US$12,674/carat) (US$9,800/carat) 3 “Rarity, Quality and Value”

7.28 carat Flawless Intense Pink Recovered at Holpan

Exceptional, record price achieved US $1.054 million (US$145,000/carat)

4 Project localities

Zimbabwe Southern Africa Limpopo r e v Ri Holpan-KlipdamHolpan-Klipdam NN o p o p Botswana im L

Pretoria SwazilandSwaziland Makoenskloof o Johannesburg Namibia op WouterspanWouterspan ol r Ventersdorp M ve Ri Vaal River

Bloemhof RSA LowerLower OrangeOrange Vaal River Orange Douglas Kimberley GalputsGalputs River Bloemfontein Riet Koa Lesotho Prieska River Springbok Valley MiddleMiddle O Springbok ran OrangeOrange ge Riv Saxendrift er 0 300 Niewejaarskraal Kilometres

5 Company overview

Established alluvial miner: 3 mines in South Africa

Life of Mine: ~14 years at 7 m tonnes per annum (@ current mining rate)

Production: US$1,656 per carat (2007 average sales price)

Positive cash-flow: FY2008 6-month turnover ~ C$26m

THG MORO acquisition being finalized – doubles LOM

Pipe-line of new projects (7)

6 Experienced management

Dr John Bristow (CEO) – ex-DeBeers Dominique de la Roche (CFO) – corporate & mining experience Jeffrey Brenner (Diamond Marketing & Sales) – rough diamond expert Hennie van Wyk (Operations Director) – experienced alluvial miner Mining & Earth Moving Manager (new appointment) Deon Vermuelen (Manager Metallurgy) – ex-DeBeers Glenn Norton (Mineral Resource Manager) – diamond & coal mining experience

7 Board of Directors

David Copeland- Chairperson(mining engineer/ geologist) John Bristow- President & CEO Mark Bristow- CEO Randgold Resources Scott Cousens- Director of Companies Dominique de la Roche- CFO

Patrick Bartlett- Independent (diamond geologist) Rene Carrier- Independent Doug Silver- Independent

8 Diamond market dynamics

Demand outstripping supply

Increasing shortage of high value (+2 carat) diamonds

+2carat stones: 7% of world production by volume, 45% by value

Strong year on year price increases

9 Rough diamond price increases 2002 - 2007

80 >$1500/ct 70 60 <$20/ct 50 $75/ct 40 30 Percent 20 10 0 Middle Orange Market Average Indian Goods River

10 Benefits of alluvial mining

Alluvial mining Kimberlite pipe mining Low capital costs High capex (~US$25 m) (~US$150m) Mobile plant + Fixed plant + equipment equipment Low operating cost High opex (~US$11- (~US$3 per tonne) 15 per tonne) Quick start-up (~3 - 6 Long lead time (+18 months) months) Rapid cash flow

11 Holpan & Klipdam mines

R371 R370 To N Warrenton Mines & r e iv R

r l Projects e a v a i V R ROCKWELL MINES R370 s t r KLIPDAM a New prospecting rights H Barkly West office Delportshoop HOLPAN R31 R374 Khosopkraal

Harrisdale N12 R370 BARKLY WEST Pretoria Johannesburg Figure 1 R31 Figure 2 Kimberley Richards Bloemfontein Bay Durban

R64 KIMBERLEY East London Port Elizabeth Cape Town

40 km R357

12 Middle Orange River

R313

er Mines and

i R385

N R

p Projects

e Douglas rights

e DOUGLAS

v i R357 ROCKWELL MINES

o MAKOENSKLOOF New prospecting rights

o l i

o Reads Drift Bulk Sampling R Lanyon Vale Trans Hex MORO Diamond O r a WOUTERSPAN Valley n g e

R iv e Pretoria r Johannesburg Figure 1 Richards Figure 2 Kimberley Bay Bloemfontein Durban R313 40 km R369 R369 PRIESKA East London R357 Port Elizabeth R347 Cape Town

13 Resources (2007 statements)

Wouterspan ~77 m tonnes Ave grade: ~0.3 cpht Ave diamond value: US$ 2,146 per carat (2007 ave) Revenue per tonne: US$ 6.30

Holpan + Klipdam ~20 m tonnes Ave grade: ~0.45 cpht Ave diamond value: US$1,217 per carat (2007 ave) Revenue per tonne: US$ 5.50

THG MORO acquisition ~86 m tonnes Ave grade: ~0.43 cpht Ave diamond value: US$1,400 (2005) Reveue per tonne: US$6.00

cpht – carats per 100 tonnes

14 Mines - Wouterspan

Resource ~ 77m tonnes Introduced larger earth moving equipment

Ave 2007 sales price: US$ 2,146 per carat

15 Mines - Holpan

Upgrading screening capacity (2008)

Installed additional trommel screen

Average 2007 Sales price: US$1,142 per carat

16 Mines - Klipdam

New Scrubber commissioned in October 2007 Upgraded & modernized processing plant

Average 2007 sales price: US$1,291 per carat

17 2007 Production & carats

~275 000 m3 per month (~ 550 000 tonnes per month) 1 986 carats per month

400,000 2,800.00

2,600.00 350,000

2,400.00 300,000

2,200.00

250,000

2,000.00

200,000 Carats Volumes m3 1,800.00

150,000 1,600.00

100,000 1,400.00

50,000 High rainfall Klipdam upgrade 1,200.00

0 1,000.00

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

2007

Volume Total: CaratsTotal: Linear (Volume Total:) Linear (CaratsTotal:)

18 RSA Power-outages

Back-up diesel generator-sets installed at all front-end screening plants

Doubled capacity of screening plants to maintain large stockpiles; choke-feed treatment plants when running

‘Scheduled’ maintenance undertaken during outages

Placed orders for 4 large back-up generator sets to run each operation (total cost ~C$1.5 m; delivery May 2008)

Cost implication: +10% to Opex for 80:20 split Eskom:genset

19 Beneficiation & marketing

Multi-pronged approach to add value:

Manufacturing and marketing agreement with Steinmetz Diamond Group for selected special stones

Manufacturing selected goods in the 2 - 5 carat stone size

Competitive sealed tender process – benefits: adds a premium Maintains cash flow

20 Beneficiation Add-value

Rough Colour Product Add-value

72c Yellow 25c vivid yellow, 10% 4c fancy yellow

212c Yellow 100c intense yellow, At GIA for 23c fancy yellow certification; >20%*

35c Vivid Yellow 2 * 10c matching At GIA for vivid yellows certification; >20%* 96c Fancy In factory * - estimates Yellow

21 Financial highlights – FY2008

Revenue FY 2008 FY 2008 QTR 1 QTR 2 Carats Sold 5231.39 7777.50 Average Selling Price $2532.20 $1581.40 Revenue - Diamond Sales C$14.0 million C$12.1 million GP% 45.27% 34.0% Profit/(Loss) C$0.4 million C$(1.1) million Cash end of Period C$36.6 million C$12.8 million Restricted Cash C$15.5 million C$15.5 million Weighted Shares in Issue 187,131,953 187,816,993 EPS (Cents) 0.23 (0.01)

Year-end : 29 Feb 08

22 Financials - Costs

COSTS QTR 1 2008 QTR 2 2008

Carats Produced 7805.98 5579.17 Tonnes 1,907,270 1,704,116 Costs – Produced Diamonds C$ 5.7million C$ 9.5million Costs – Amortization and depletion C$ 2.0 million C$ 2.1 million Cost per Tonne (Inc amortization) $4.00 $5.48 Cost per Tonne (Excl amortization) $2.97 $4.21 Cost Per Carat $978 $1364 COST BREAKDOWN Fuel and Oils 27% 31%

Maintenance and repairs 30% 23%

Salary and wages 24% 28%

Drilling and blasting 6% 4%

Security 4% 2%

Royalties 5% 5%

23 New projects & acquisitions

Primary focus - high-value alluvial diamond production eg. MOR area; other producing entities

Awarded 6 new prospecting permits in RSA; 4 in MOR area

Assessing Kwango River alluvial project in Democratic Republic of Congo (DRC)

Concluding Trans Hex MORO acquisition (includes Saxendrift and Niewejaarskraal mines on C+M)

Pursuing other acquisition targets (must be value accretive)

24 THG MORO Acquisitions

R313

er Mines and

i R385

N R

p Projects

e DOUGLAS

v i R357 ROCKWELL MINES

o Makoenskloof New prospecting rights

o l i

o o WOUTERSPAN Bulk Sampling R Trans Hex MORO O r Saxendrift a n g e

Niewejaarskraal R iv e Pretoria r Johannesburg Figure 1 Richards Figure 2 Kimberley Bay Bloemfontein Durban R313 40 km R369 R369 PRIESKA East London R357 Port Elizabeth R347 Cape Town

25 Pro-forma production projection Assumptions 5 to 6 mining operations by end-2011 Trans Hex acquisition doubles resource base Conservative average diamond value Resource Profile Saxendrift Wouterspan Holpan/Klipdam Pro Forma

Inferred Resources (million tonnes) 63.8 33.2 20.4 117.4

Indicated Resources (million tonnes) 18.2 43.6 61.8

Grade cpht 0.39 0.31 0.41 0.38*

Ave Diamond Value (US$/carat) 1,400 1,783 1,330 1506**

*Weighted average ** Assumed long term average price

26 Pro-forma production projection

Group Production Profile (Monthly Average)

In-situ valuation ~ 2500 US$1,018,020,000 Projected production: ~1.95M 2000 tonnes per month by end-2011 1500

Based on revenues and costs Tonnes (000's) 1000 equates on a 74% basis to: 500 ~US$110M revenue per year

~US$59M operating margin 0 per year 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 HOLPAN/KLIPDAM WOUTERSPAN MAKOENSKLOOF SAXENDRIFT NIEWEJAARS REMHOOGTE Shortage of electrical power from National utility grid could slow projected growth

27 Highlights

Established producer (not an explorer)

High average prices: US$1,656 per carat in 2007

Benefiting from world shortage of large diamonds

Positive financial performance

Main Board TSX and JSE listings completed

28 Corporate Structure

Shares on issue: 223.6m Fully diluted: 392.6m Market Capitalization: ~C$130m

Warrants ~42 m: (2yr structure – 80c strike in 2008; 100c in 2009; can generate C$25m in 2008) Warrants ~115m: (2 yr period @ 70c)

Cash on hand ~C$20m

29 Share Analysis TSX:RDI JSE:RDI OTCBB:RDIAF

Price and Volume Shareholders TSX: RDI Major Institutional Holders $0.80 Pala Investments 16.7% $0.70 BlackRock Financial 7.6% Peregrine Capital 4.9% $0.60

(C$/share) QVT Financial 4.3% $0.50 BAC Fund 3.2%

$0.40 Front Street Capital 2.4% M-07 A-07 M-07 J-07 J-07 A-07 S-07 O-07 N-07 D-07 J-08 F-08 Craton Capital 2.4% Volume (000s)

4,000 Cadiz African Harvest 2.2% 3,000 Oryx Investment Mgt 2.1% 2,000 1,000 US Global Investors 1.6%

0 M-07 A-07 M-07 J-07 J-07 A-07 S-07 O-07 N-07 D-07 J-08 F-08 Directors/Mgmt 6.9%

Other 45.7%

30 Appendices

31 High value producer… Selected examples May 2006 - Jan 2007

156 carats 39 carats 152 carats 132 carats Flawless D Flawless D Flawless D Intense Yellow US$5.7M US$858,000 US$4.3M US$1.6M (US$37,000/carat) (US$22,000/carat) (US$28,000/carat) (US$12,200/carat)

51 carats 49 carats 34 carats 54 carats Spotless D D Vivid Yellow Fancy Yellow US$1.3M US$1.0M US$720,000 US$432,000 (US$25,750/carat) (US$21,200/carat) (US$21,100/carat) (US$8,000/carat)

32 Diamond Characteristics

0.01 0.01 0.1 VEVVEVee nKL ntKLerterIsPIsdPGdorGorApATpT 0.1 SWVSWaal R RIVERVIiIvVERVIer EWEW Vaal River 2 2 BW HOLPAN 5 HBWHoolplp aHanOn-K-LKlipPlipANddaamm 5 1010 MOMidRdl eW OPrAangN e River 20 MOMidRdl eW OPrAangN e River 20 Greater than Z Greater than Z 4040 6060 70% 8080 > 2 carats 9090 9595 9898 Percentage Carats Percentage Carats

100100 0.0.0101 0.0.11 11 1100 100100

CCaararatsts pe per rSt Stoneone ( Z(Z) )

33 Alluvial Diamond Deposits

Uplift Erosion Kimberlite pipes carry Alluvial Terraces diamonds to surface Rivers transport creates secondary (alluvial) Longshore drift weather/wind diamond deposits Deposition

Poor quality diamonds Atlantic destroyed Ocean Eroding Gemstones survive Kimberlites

RaisedRaised Drowned BeachesBeaches Beaches Rooikoppie Calcrete Upper Gravels 3 – 12m Basal Gravels

Bedrock

Trap Sites 34 Mining and processing Flow Sheet

ROM Bin Open Pit Gravel Mining +70 mm Oversize Trommel Back-fill Screen

-70 mm

Plant ROM Stockpile

Process ROM water Bin Scrubber dam Prep-screen

Scrubber water supply +30mm DMS or Sinks -30 mm +2.0 mm Rotary Pan Plant -2.0 mm Fresh Concentrate water +0.35 mm Float Bin pump -0.35 mm De-grit screen Mine Residue Final Recovery Deposit -70 mm +30 mm to X-Ray, Grease Rehabilitation Rehabilitation

Return water 35 BEE ownership

BEE partner - Africa Vanguard Resources (AVR)

26% ownership of South African assets

Contribute to development of business, support training and skills development

Actively pursuing other diamond projects with BEE partner