Dr. John Bristow

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Dr. John Bristow Botswana Resources Sector
Conference 24 July 2008
TSXRDI JSERDI OTCBBRDIAF
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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 Rockwells 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.

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Investment Highlights

• Producer and Developer
• Established low cost alluvial diamond producer
  15 years life of mine at current rate of 6.5
  million tonnes per annum from 3 established mines
  
  
• Producer of exceptionally high value diamonds
  US1754/carat in FY2008 (14 year on year
  increase)
• Positive cash flow at operations Revenue for FY
  2008 C48 million (annualized)
  
  

• Acquirer (to fast-track Growth)
• Middle Orange River (MOR) acquisition completed
• Adds mines and advanced projects
• Doubles resource base
• Pipeline of five new projects

• Beneficiator (on selective basis)
• Long-term beneficiation and marketing agreement
  with Steinmetz Diamond Group
• Pursuing additional options

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Investment Summary

• Shares Outstanding (June 30, 2008)
• 238 million
• 406.7 million Fully Diluted
• Trading Symbols
• TSXRDI
• JSERDI
• OTCBBRDIAF
• 52 week trading range
• TSX - C0.80 C0.40
• Key Financial Data (June 30, 2008)
• Cash on Hand - C13million
• Fully Diluted Cash 113million
• Note assuming all warrants exercised in
  2008

• Major Institutional Shareholders
• Pala Investments 18.1
• BlackRock Financial 7.2
• Peregrine Capital 4.6
• QVT Financial 4.1
• BAC Fund 3
• Directors/Mgmt 12

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Experienced Management

• Dr John Bristow, President CEO
  
  
• Over 25 years experience, encompassing the
  exploration, evaluation and mining of kimberlite
  and alluvial diamond deposits, including 12 years
  with 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
  
  
• Bruce Cubitt, Mining Earth Moving Manager
• Appointed April 2008
• Deon Vermuelen, Manager Metallurgy
• Ex-DeBeers
  
• Glenn Norton, Mineral Resource Manager
• Diamond coal mining experience
• Supported by a strong Board of Directors

152 carats, Flawless D color US4.3million
(US28,000/ct)
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High value producer of rarity, quality and value
Selected examples January 2007 to
present
110 carats, I/J colour US 555,555 (US5,000/cara
t)
212 carats, Yellow US2.44 million
(US11,500/carat)
107 carats US 1.07 million (US10,000/carat)
72.58 carats, Fancy Yellow US919,880 (US12,674/c
arat)
7.28 carat Flawless Intense Pink US 1.054
million (US145,000/carat )
96.33 carats, Fancy Yellow US950,000 (US9,800/ca
rat)
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Diamond market dynamics

• Demand outstripping supply
• Increasing shortage of high value (2 carat)
  diamonds
• 2 carat stones 7 of world production by
  volume, 45 by value
• Strong Year on Year price increases
• DeBeers has recently increased rough prices 8
• 5 carat stones have become an investment
  
  for the wealthy

7.28 carats, US1.054million
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Rough diamond price increases 2002 - 2007
Note Segmentation in diamond market
gt1500/ct
lt20/ct
Rockwell production is primarily from alluvial
mining operations
75/ct
Percent
Cutting and polishing industry in India,
south-east Asia consumes smaller size goods,
price increased 50 from 2002
Worldwide average price is 75/ct, increase of
35 from 2002
Average prices have increased 70 to over US
1500/ct since 2002
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Benefits of alluvial mining

• Kimberlite pipe mining
• High capex (US150m)
• Fixed plant and equipment
• High opex (US11-15 per tonne)
• Long lead time (18 months)

• Alluvial mining
• Low capital costs (US25 m)
• Mobile plant and equipment
• Low operating cost (US3 per tonne)
• Quick start-up (3 - 6 months)
• Rapid cash flow

Examples TransHex Group, Gem Diamonds Ltd,
Vaaldiam Resources Ltd, SDM (Angola, private)
Examples Ekati, Harry Winston/Diavik Mine, Gem
Diamonds Ltd., African Diamonds (AK6)
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Project locations
Northern Cape Province, South Africa -Projects
located on major road/rail systems -Kimberley-
Centre of the RSA rough Diamond Industry and
location of DeBeers Sorting House
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Holpan and Klipdam Vaal River Operations
(owned 74 RDI)
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Middle Orange River Operations (MOR) (owned 74
RDI)
Note Acquisition of Trans Hex Middle Orange
River Operations concluded April 2008
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Resources significant growth
Holpan and Klipdam SG 1.85 Wouterspan and the
South Bank MORO SG 2.1
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Mines-Holpan Klipdam

• Added screening capacity
• Installed new high volume scrubber
• Upgraded Pan-plant
• FY 2008 Sales Price US 1,230 per carat
• Operating cost - US 3.00 per tonne

• Added screening capacity
• Optimized DMS
• FY 2008 Sales Price US 1,201 per carat
• Operating cost - US 3.00 per tonne

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Mines - Wouterspan

• Resource 77million tonnes
• Expanding production through introduction of
  larger equipment
• Operating since 2005
• Historical production gt 20,000 carats

• Average FY 2008 Sales Price US 2,292 per
  carat
• Production FY 2008 8,019 carats
• Operating cost of mine - US 4.00 per tonne

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Mines - Saxendrift

• Concluded transaction April 2008
• 35tph DMS and X-ray Flow-sort plant
  re-commissioned
• Re-commissioning 4 x Rotary-pan plant

• First diamonds already recovered
• Fabrication of new large volume Rotary-pan
  wet-plant well advanced commissioning 3rd Q
  FY2009

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2007-2008 Production Volume Carats
Notes -Apr 07- High rainfall and Easter
Holiday -Oct 07- New scrubber installation and
modernization of Klipdam plant -Dec07
Jan08-Xmas and New Year Shutdown -Mar08 High
rainfall and Easter Holiday
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Beneficiation Marketing

• Manufacturing and marketing agreement with
  Steinmetz Diamond
  Group for selected special stones
• Leveraging unique diamond production adding
  value
• Beneficiating 2-5 carat range of production
• Establishing cutting and polishing
  
  factory for specific size ranges

• Competitive sealed tender process
• Premium added to diamond sales value
• Cash flow provides consistent monthly
  
  
  cash flow

102 carat, Vivid Yellow
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Beneficiation - Adding value
Conservative estimates Note Value created from
marketing agreement with Steinmetz Diamond Group
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Financial highlights FY2008
Notes -Cost per tonne for the financial year Feb
08-4.32 -Operating costs are trending downwards
US3.60 per tonne in March 2008 and US 3.30
per tonne anticipated for April 08 with further
cost reductions to get to 3.00 -Rockwell has
recently changed year-end to 29 Feb
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Addressing cost challenges

• On-going reviews of mine plans, haul-way layouts,
  plant locations, rehabilitation sequencing
• Rationalization and optimization of mining fleet,
  and all other vehicles (petrol rather than
  diesel!)
• In-pit screening where feasible (particularly in
  the dry winter period)
• Dynamic stockpile management
• New processing plants will comprise high volume,
  modular constructions with improved efficiencies

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New projects acquisitions

• Primary focus - high-value alluvial diamond
  production
• eg. Middle Orange River (MOR) area and other
  producing entities
• Awarded 5 new prospecting permits in RSA 4 in
  MOR area
• Field mapping and RC drilling on new prospecting
  permits on-going
• Concluded Trans Hex MORO acquisition
• Saxendrift DMS plant re-commissioning complete
• Rotary Pan-plant re-commissioned underway
• Pursuing other acquisitions (must be accretive)

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Current Resources Profile
Saxendrift South Bank MOR
With more than 160 million tonnes of inferred
resource and 30 million tonnes of indicated
resource, the in-situ value of resource is US
1.3 billion. Rockwell has an in-situ diamond
value of approximately US 1 billion for its 74
holding.
1Saxendrift diamond value is an estimate as no
recent sales data is available Assumptions -5
to 6 mining operations by end-2011 -Saxendrift
South Bank Middle Orange River Operations (MOR)
acquisition doubles resource base
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Forecasted Production Carats Earnings
Notes -In-situ diamond value US1.3 billion
(100) -Earnings based on 100 -Rockwell realizes
74
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Investment Summary

• Diamond market shortfall
• Established producer with production profile
• Middle Orange River (MOR) Saxendrift
  acquisition completed
• Diamond Production of exceptional quality -US
  1754 per carat for FY 2008US1,536 per carat in
  2007(14 YoY increase)
• Expanding operations
• Beneficiation adding value
• Pursuing other acquisitions

Two matching 10carat vivid yellows