Airborne Gravity 2010 - Geoscience Australia

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Airborne Gravity 2010 Figure 2. (a) Air-FTG data collected using a Grand Caravan, (b) ground gravity data upward continued to equivalent survey height, and (c) Air-FTG data collected with the airship platform. The position of a known kimberlite near the centre of the test area is highlighted. Figure 4 presents a breakdown of activities actually experienced on the project. Productive surveying was only achieved for 29% of the time that the system was nominally available. In total, the airship itself was not available for production for 28% of the time. This was primarily due to technical issues associated with the airship, with a very minor contribution associated with the duty hours of the pilots and ground crew. The experience of ZLT prior to the commencement of this operation was that the airship would likely experience 10% downtime due to technical issues. The fulltime process of operating and mooring the airship outside in a dusty, hot, windy environment was the root cause of the increased downtime. Had a suitable hangar or shelter been readily available, this would have protected the airship and would have improved the time required to resolve problems and increased the effectiveness of the ongoing maintenance and repairs carried out in the field. Additionally the airship deployed for the program was a pre-production prototype. The use of a later production model, not available for use during this program, may have improved reliability. 101
Airborne Gravity 2010 Figure 3. Weekly and cumulative production statistics for the De Beers airship system over the 22-month duration of the Jwaneng project. A 6-month shut-down was implemented between 2006/10 and 2007/4 due to airship damage. Figure 4. Breakdown of activities over the duration of the De Beers Airship project. Production was accomplished during 29% of the project duration. The airship was not available 28% of the time, mainly due to technical problems. 102
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