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Overview of De Beers Prospecting in Botswana

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Overview of De Beers Prospecting in Botswana

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    1. Overview of De Beers Prospecting in Botswana

    9. Why Gravity? A combination of gravity and magnetic data provides virtually complete discovery of buried economic kimberlites. In particular, larger kimberlites that have a higher propensity to be non-magnetic, usually possess a strong gravity response. Small cluster of kimberlites highlights why combination of gravity and magnetic data is essentialSmall cluster of kimberlites highlights why combination of gravity and magnetic data is essential

    12. Zeppelin NT Airships have high inertia (+8000 kg mass) and large dimensions Gusts and maneuvers cause minimal movement in gondola Airship 10 to 100 times quieter (i.t.o. vertical and lateral accelerations) Top Speed: Set by Steve Fossett Minimum ground crew to launch and land: 3 people, actual crew on site larger than this to help manage and monitor all systems.Top Speed: Set by Steve Fossett Minimum ground crew to launch and land: 3 people, actual crew on site larger than this to help manage and monitor all systems.

    13. Zeppelin NT- technical specifications Dimensions Length 75 m Width 19.5m Height 17.4 m Envelope Volume 8425 m³ Ballonet Volume 2200 m³ Gondola No of seats 2+12 (2+1 for survey) Cabin Volume 29 m³ Cabin length 10.7 m Mass Max take off weight 8,150 kg Payload (@1000 mamsl) 1,900 kg Propulsion 3 x Textron Lycoming 147 kW IO-360 200 hp Performance Max level flight speed 125 km/h Range 900 km Max Endurance 20 hrs Top Speed: Set by Steve Fossett Minimum ground crew to launch and land: 3 people, actual crew on site larger than this to help manage and monitor all systems.Top Speed: Set by Steve Fossett Minimum ground crew to launch and land: 3 people, actual crew on site larger than this to help manage and monitor all systems.

    14. Production milestones 28th August 2005- Zeppelin landed in Cape Town 15th September 2005 arrived Gaborone Installations and calibrations in Gaborone 24th October 2005 - ferried to Jwaneng 3rd November 2005 production commenced on the first block (1572km2)

    15. Survey Specifications Line spacing of 150 m for test program Optimum survey speed set at 60 km/h Survey altitude 80 m Pilots can accurately stay on track with cross-winds of speeds up to 25 km/hour Program in summer conducted at night to increase payload and to reduce influence of winds and thermal activity 15 kts (27 km/h)15 kts (27 km/h)

    16. FIRST RESULTS: QUALITATIVE Ground gravity provides low noise data: essentially the truthGround gravity provides low noise data: essentially the truth

    17. FIRST RESULTS: QUALITATIVE Fixed wing data collected with a Grand Caravan shows poor correlation with ground gravity data and a kimberlite in the middle of the slide is not visible. Fixed wing data collected with a Grand Caravan shows poor correlation with ground gravity data and a kimberlite in the middle of the slide is not visible.

    18. The main issue is speed as the ground cannot be held forever with the lower cost being added bonus.The main issue is speed as the ground cannot be held forever with the lower cost being added bonus.

    19. Quantitative Results Improvement over fixed-wing systems: 4 times improvement in resolution 3 times improvement in system noise This result will improve with time as system beds down Data quality from airship system not affected by weather

    20. Conclusions and way forward The Bell gravity system mounted aboard a Zeppelin airship in the quietest, highest resolution airborne gravity system available The deployment of the system in Botswana is successful Large volumes of data can be routinely collected, 40X faster than ground crew Continued data collection over Debot and JV permits in the Jwaneng area Follow-up prospecting to commence ground geophysics sampling drilling bulk sampling evaluation Thereafter move to other regions of interest in Botswana

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