Towards 3D Maps of Alteration Under Cover: Regional Constrained 3D Inversion of Potential Field Data from the Olympic Cu-Au Province, South Australia

Williams, Nicholas; Lane, Richard; Lyons, Patrick D.

doi:10.1071/aseg2004ab160

Cited by 17 publications

(10 citation statements)

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“…Three-dimensional potential field modeling can help us better understand the structural architecture of a region ͑e.g., Goleby et al, 2002;Williams et al, 2004;Meixner and Lane, 2005;Murphy et al, 2006;Welford and Hall, 2007͒. To be effective, significant rockproperty contrasts must exist between some of the major geologic units.…”

Section: Introductionmentioning

confidence: 99%

The Paleoproterozoic Kristineberg mining area, northern Sweden: Results from integrated 3D geophysical and geologic modeling, and implications for targeting ore deposits

2009

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The Kristineberg mining area in the western part of the Paleoproterozoic Skellefte Ore District, northern Sweden, is well known for its base-metal and recent gold discoveries. A pilot 3D geologic model has been constructed on a crustal scale, covering an area of 30ϫ 30 km to depths of 10 km. Constrained 3D inverse and forward gravity modeling have been performed to confirm and refine previous modeling along seismic profiles using mainly 2.5D techniques. The 3D inverse gravity modeling was geared to generating isodensity surfaces that enclose regions within the model of anomalous density contrast. The 3D forward gravity modeling was conducted to include faulting and folding systems that are difficult to include in the inversion. The 3D geologic model supports many previous interpretations but also reveals new features of the regional geology that are important for future targeting of base-metal and gold deposits. The margins of a thick granite in the south dip steeply inward, suggesting the possibility of room to accommodate another large base-metal deposit if the granitic rocks are juxtaposed with volcanic rocks at depth. Gravity modeling also suggests the observed Bouguer gravity high within the western metasediments can be explained by a large mafic intrusion that has dioritic to tonalitic composition and no significant magnetic signature. Because mafic-ultramafic intrusions within metasediments can indicate gold, this interpretation suggests the western metasediments have a high gold potential.

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Section: Introductionmentioning

confidence: 99%

The Paleoproterozoic Kristineberg mining area, northern Sweden: Results from integrated 3D geophysical and geologic modeling, and implications for targeting ore deposits

2009

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“…These surveys were well integrated with petrophysical measurements carried out in boreholes and in the laboratory to constrain the seismic interpretations. Multidisciplinary works for studying large-scale structures hosting mineral deposits also are reported by several authors in Australia (e.g., Goleby et al, 2002;Evans et al, 2003;Williams et al, 2004;Stolz et al, 2004;Urosevic et al, 2005), in Canada (Roy and Clowes, 2000), and in Europe (Juhlin et al, 2002;Korja and Heikkinen, 2005;Malehmir et al, 2006Malehmir et al, , 2007.…”

Section: Introductionmentioning

confidence: 99%

Seismic methods in mineral exploration and mine planning: A general overview of past and present case histories and a look into the future

et al. 2012

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Due to high metal prices and increased difficulties in finding shallower deposits, the exploration for and exploitation of mineral resources is expected to move to greater depths. Consequently, seismic methods will become a more important tool to help unravel structures hosting mineral deposits at great depth for mine planning and exploration. These methods also can be used with varying degrees of success to directly target mineral deposits at depth. We review important contributions that have been made in developing these techniques for the mining industry with focus on four main regions: Australia, Europe, Canada, and South Africa. A wide range of case studies are covered, including some that are published in the special issue accompanying this article, from surface to borehole seismic methods, as well as petrophysical data and seismic modeling of mineral deposits. At present, high-resolution 2D surveys mostly are performed in mining areas, but there is a general increasing trend in the use of 3D seismic methods, especially in mature mining camps.

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“…ore-bearing hematite alteration. This occurs within a more regional envelope of high magnetization and high gravity due to gangue magnetite alteration (Hart and Freeman, 2004;Williams et al, 2004). The poorly exposed Gawler craton comprises metamorphic and igneous rocks spanning ages from 2.45 to 1.54 Ga (Daly et al, 1998;Swain et al, 2005b).…”

Section: Introductionmentioning

confidence: 99%

Regional Crustal Setting of Iron Oxide Cu-Au Mineral Systems of the Olympic Dam Region, South Australia: Insights from Potential-Field Modeling

Direen

Lyons

2007

Economic Geology

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Towards 3D Maps of Alteration Under Cover: Regional Constrained 3D Inversion of Potential Field Data from the Olympic Cu-Au Province, South Australia

Cited by 17 publications

References 0 publications

The Paleoproterozoic Kristineberg mining area, northern Sweden: Results from integrated 3D geophysical and geologic modeling, and implications for targeting ore deposits

The Paleoproterozoic Kristineberg mining area, northern Sweden: Results from integrated 3D geophysical and geologic modeling, and implications for targeting ore deposits

Seismic methods in mineral exploration and mine planning: A general overview of past and present case histories and a look into the future

Regional Crustal Setting of Iron Oxide Cu-Au Mineral Systems of the Olympic Dam Region, South Australia: Insights from Potential-Field Modeling

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