Magnetic and Gravity Modelling of the Renison Tin Mine, Tasmania

Roberts, S.S.J.; Mudge, Stephen T.

doi:10.1071/eg997292

Cited by 3 publications

(2 citation statements)

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“…The gravity and magnetic methods are fundamental geophysical exploration techniques for uncovering subsurface structures of the Earth [ Blakely , ]. Due to their relatively simple mathematical theory and robust performance, the gravity and magnetic surveying methods are widely applied in mining problems [ Kamm et al ., ; Martinez et al ., ; Mosher and Farquharson , ; Nabighian et al ., ; Roberts and Mudge , ], investigations of crustal structures and the Moho interface [ Aitken et al ., ; Prutkina and Salehb , ; Saleh et al ., ], and environmental geophysical problems [ Eppelbaum , ; Rim and Li , ; Uieda and Barbosa , ; Zunino et al ., ]. Gravity and magnetic observation sites can be situated either on or underneath the ground surface, or the sensors can be carried on board an aircraft flying at a certain height.…”

Section: Introductionmentioning

confidence: 99%

Fast 3‐D large‐scale gravity and magnetic modeling using unstructured grids and an adaptive multilevel fast multipole method

et al. 2017

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A novel fast and accurate algorithm is developed for large‐scale 3‐D gravity and magnetic modeling problems. An unstructured grid discretization is used to approximate sources with arbitrary mass and magnetization distributions. A novel adaptive multilevel fast multipole (AMFM) method is developed to reduce the modeling time. An observation octree is constructed on a set of arbitrarily distributed observation sites, while a source octree is constructed on a source tetrahedral grid. A novel characteristic is the independence between the observation octree and the source octree, which simplifies the implementation of different survey configurations such as airborne and ground surveys. Two synthetic models, a cubic model and a half‐space model with mountain‐valley topography, are tested. As compared to analytical solutions of gravity and magnetic signals, excellent agreements of the solutions verify the accuracy of our AMFM algorithm. Finally, our AMFM method is used to calculate the terrain effect on an airborne gravity data set for a realistic topography model represented by a triangular surface retrieved from a digital elevation model. Using 16 threads, more than 5800 billion interactions between 1,002,001 observation points and 5,839,830 tetrahedral elements are computed in 453.6 s. A traditional first‐order Gaussian quadrature approach requires 3.77 days. Hence, our new AMFM algorithm not only can quickly compute the gravity and magnetic signals for complicated problems but also can substantially accelerate the solution of 3‐D inversion problems.

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Section: Introductionmentioning

confidence: 99%

Fast 3‐D large‐scale gravity and magnetic modeling using unstructured grids and an adaptive multilevel fast multipole method

et al. 2017

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“…The topography of Tasmania is such that gravity station corrections well in excess of 10 mGal are not uncommon, while other stations within a few kilometres may be less than 0.5 mGal, underscoring the need for accurate terrain effect characterisation. The particular importance of the terrain correction in western Tasmania in general and for mineral exploration in particular has been highlighted by case studies such as that of Roberts and Mudge (1997).…”

Section: Introductionmentioning

confidence: 99%

Revising gravity terrain corrections in Tasmania

Duffett

2016

ASEG Extended Abstracts

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SUMMARYTerrain corrections for determination of the complete Bouguer anomaly are empirically evaluated with respect to a number of different techniques, parameters and digital terrain model data sets, for areas in western and northern Tasmania.For the most part, while terrain corrections calculated from very high resolution terrain models (1.2 metres or better) are presumed to deliver the most accurate results, those computed for the same area using only a Statewide 25 metre-cell digital terrain model to within two metres of gravity stations correspond remarkably well. Internally consistent comprehensive terrain correction of acceptable yet maximal accuracy can therefore be calculated for all Tasmanian gravity stations, even if very high resolution DTMs are unavailable.Fully automatic terrain correction computation from two metres to 167 kilometres from gravity stations will result in significantly improved removal of topographic effects over extant manual corrections, which were limited to 22 kilometres.

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