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Presentation overviewing gravity and magnetic data available for the Tasman Frontier region and the interpretation and modelling of those data.

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This report outlines the level survey completed during the visit to Port Vila, Vanuatu in April 2008. This is the second EDM Height Traversing level survey of the deep bench mark array in Port Vila, Vanuatu, the first was completed in 2006 when the level technique comparison surveys were performed. The 2008 survey is a repeat EDM Height Traversing survey and on nine previous occasions, from 1993 to 2004 the Vanuatu level survey was performed by the National Tidal Centre (NTC) using the Precise Differential Levelling technique. This project is sponsored by the Australian Agency for International Development (AusAID), managed by the Bureau of Meteorology (BOM) and supported by the National Geospatial Reference Systems Project (NGRS), Geospatial Earth Monitoring Division, GEOSCIENCE AUSTRALIA.

Benbow crater is the main residual active centre of the large ancient volcano which has formed Ambrim Island. For the eleven months preceding December 1951 it has been the source of extraordinarily intense and prolonged explosive activity. The volume of ash and scoria ejected during this period exceeds 800,000,000 cubic metres. Evidence has been found during the recent inspection of this volcano that suggests that the current phase of explosive activity has ended. The 1950-1951 eruption, possibility of future activity, and effects of the eruption, are discussed in this report.

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The presence of native sulphur on the slopes of Mt. Suretamatai, Vanua Lava Island, Banks Group has been known since 1887 or earlier, and many claims, most of them extravagant, have been made regarding the potential value of the deposits. More recently manganese has been reported on the island of Maewo, and there have been unsubstantiated rumours of the presences of nickel, chromite, copper, cobalt, gold and coal, as well as sulphur on islands other than Vanua Lava. With the examination of the sulphur and manganese deposits as the principal object, the writer visited the New Hebrides from 7th July to 14th August 1951, and took the opportunity of following up the rumoured occurrences of economic minerals as far as circumstances permitted. This report gives an account of the visit and its findings.