Airborne Gravity 2010 - Geoscience Australia

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Airborne Gravity 2010 Conclusions A Zeppelin airship is unique in its ability to provide a very low acceleration environment while also closely adhering to a prescribed flight-path in a variety of wind conditions. Over a major test area, the Air-FTG® data acquired on a Zeppelin NT airship possessed a noise level of 1.7 E RMS. The airship flies at ¼ the speed of the standard fixed-wing implementation of the Air-FTG system and it was shown that features with a wavelength of 100 m could be resolved in the data. The technical limitation of deploying the airship into the high altitude and hot daytime temperatures of South-Central Botswana was mitigated through a night-time flight program. An analysis of the production data showed that for 28% of the time, the airship was unable to fly due to technical problems, a figure that far exceeded the original estimates. During the duration of the survey program, the airship was flown and moored fulltime in the harsh Kalahari Desert conditions. The downtime in a future program would be reduced if the program was conducted in a more hospitable environment or if hangar facilities are available. Additionally, if a later production model had been available, it would likely have improved reliability over the pre-production prototype airship that was deployed. The second largest impact on the day-to-day productivity of the airship system was weather downtime, accounting for 14% of the project duration. Given the seasonal winds and violent storms during the rainy season the observed level of weather downtime was not unexpected. As anticipated, weather had very little impact during the relatively calm winter period. As with fixed-wing AGG operations, it is important to identify the best weather window with cool temperatures and light winds and to favour this period for airborne surveying. The availability of accurate real time weather radar images during future surveys should increase the productivity levels over those observed. In the absence of such a service, mobile vehicle mounted weather radar instruments could be deployed in the field to improve productivity. The high-quality airship gravity gradient data allowed kimberlite targets to be selected in the Jwaneng area without the large number of false targets associated with an equivalent fixed-wing survey. This greatly reduced the time and cost of the subsequent follow-up program. The high quality data acquired reduced the risk of missing an economic body, and a new kimberlite was discovered over an area that had been heavily prospected utilizing other techniques. Acknowledgements The authors would like to thank De Beers Group Services for permission to publish this paper and for the invaluable assistance provided during the roll-out of the project by many individuals at Bell Geospace and Zeppelin Luftshifftechnik. References Hatch, D. M., 2004, Evaluation of a Full Tensor Gravity Gradiometer for Kimberlite Exploration: In R. J. L. Lane (editor), Airborne Gravity 2004 – Abstracts from the ASEG-PESA Airborne Gravity 2004 Workshop: Geoscience Australian Record 2004/18, 73-79. Hatch, D. M., Kuna, S., and Fecher, J., 2006, Evaluation of an Airship Platform for Airborne Gravity Gradiometry: Proceedings of the Australian Earth Sciences Convention, July 2nd-6th, 2006, Melbourne, Australia. Hatch, D., Murphy, C., Mumaw, G. and Brewster, J., 2006, Performance of the Air-FTG® System aboard an Airship Platform: Proceedings of the Australian Earth Sciences Convention, July 2nd- 6th, 2006, Melbourne Australia. Hatch, D. M., Murphy, C., Mumaw, G., and Brewster, J., 2007, Performance of the Air-FTG System aboard an airship platform: Preview, 127, 17 - 22. Hinks, D., McIntosh, S., and Lane, R. J. L., 2004, A Comparison of the FALCON and Air-FTG® Airborne Gravity Systems at the Kokong Test Block, Botswana: In R. J. L. Lane (editor), Airborne Gravity 2004 – Abstracts from the ASEG-PESA Airborne Gravity 2004 Workshop: Geoscience Australian Record 2004/18, 125-134. 105
Airborne Gravity 2010 Murphy, C.A., 2004, The Air-FTG airborne gravity gradiometer system: In R. J. L. Lane (editor), Airborne Gravity 2004 – Abstracts from the ASEG-PESA Airborne Gravity 2004 Workshop: Geoscience Australian Record 2004/18, 7-14. Sander, S., Ferguson, S., Sander, L., Lavoie, V., and Charters, R. A., 2002, Measurement of noise in airborne gravity data using even and odd grids: First Break, 20, 524-527. 106
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