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2 – Geophysical Detection of Mineral Systems: The Importance of Deep
Penetrating Geophysical Methods
SBGF SPONSORED SHORT COURSE
MINISTRANTE: Mike Dentith – University of Western Australia
IDIOMA: Inglês
DATA: 19 e 20 de maio de 2016
LOCAL: Parque Metalúrgico de Ouro Preto, MG
CARGA HORÁRIA: 16 horas (2 dias)
CONTEÚDO: This course provides a state-of-the-art overview of geophysical exploration
methods without recourse to complex mathematical descriptions. Concentrating on
gravity and magnetic data and using a combination of lectures and real-world practical
exercises, course participants are guided through the basic physical phenomena, the
acquisition and processing of geophysical data, to the creation of subsurface models and
their geological interpretation. 1. Explains the cutting-edge current practice in
exploration and mining geophysics; 2. Gives a practical guide to data acquisition,
processing, and accurate interpretation of geophysical datasets; 3. Includes presentation
and analysis of petrophysical data, giving key information on the physical properties of
rocks; 4. Emphasises extraction of maximum geological information from geophysical
data, providing explanations of data modelling, and common interpretation pitfalls; 5.
Provides examples from the main types of mineral deposit around the world.
PERFIL DO MINISTRANTE:
Qualifications
BSc Nott., PhD Glas.
Key research
My research interests are predominantly in applied geophysics, in particular
research relevant to the mining and petroleum industries and cross-disciplinary
studies combining the different, but complementary, geological information
present in various geoscientific datasets. I also have geological research
interests in palaeoseismology, the structure and tectonics of mineralised
terrains and hydrocarbon basins, astroblemes, mafic dyke swarms and
petrophysics.
Mining industry-related research includes; understanding the geophysical
responses of mineral deposits especially from a petrophysical/geological
perspective; novel approaches to processing of magnetic and similar datasets;
and the ‘geological’ interpretation of geophysical datasets from mineralised
terrains.
www.adimb.com.br/simexmin2016
Petroleum-industry relevant research involves mostly the structural
interpretation of gravity, aeromagnetic and seismic reflection data.
I am also interested in intra-plate seismicity in the context of the associated
eismic hazard, which requires geophysical studies ranging in scale from local,
near surface (palaeofault scarps), to the regional/crustal scale (wide-angle
seismic survey using mine blast sources).
Most projects are carried out with colleagues with geological or geographical
xpertise. Several current projects involve providing a geophysical component to
what is dominantly a geological project.
Some specific research areas are described below:
Geophysical Responses of Mineral Deposits
Western Australia
This project was initiated when it was recognised that a mineral province of the
importance of Western Australia was poorly described in terms of geophysical
case studies. Numerous industry authors contributed papers, including the first
significant descriptions of major deposits such as the Golden Mile near
Kalgoorlie, the iron ore deposits of the Hamersley Basin, the heavy mineral
sands at Enneabba.
The resulting publication, “Geophysical Signatures of Western Australian
Mineral Deposits”, has sold around 1000 copies, i.e. its entire print run and only
a few copies are still available. Since the 1994 publication/session case study
publications have become common place in the ASEG’s journal Exploration
Geophysics”.
South Australia
This project was supported by Primary Industries and Resources South
Australia. Reflecting then state of knowledge in South Australia much material
was located in the Government archives and re-interpreted. During the latter
stages of the project recent exploration successes in South Australia allowed
several industry authors to contribute to the project.
“Geophysical Signatures of South Australian Mineral Deposits” is available
through ASEG publication outlets.
Interpetation of Geophysical Imagery
Interpretation of Regional-Scale Geophysical Datasets from Mineralised Terrains
(magnetics, seismic, gravity, magnetotellurics)
Intra- plate Seismicity and Seismic Hazard in the Southwest of Western Australia
Geophysical Studies of Sedimentary Basins in Western Australia and the
www.adimb.com.br/simexmin2016
Northern Territory
Publications
Geophysical signatures of Western Australian mineral deposits
Geophysical signatures of South Australian mineral deposits
Future research
Petrophysical characteristics of mineralisd terrains and environments
Funding received
Computer based geological cross-section restoration.
University of Western Australia Individual Research Project Grant. 1990.
The geometry and Phanerozoic history of the Darling Fault and associated
structures in the Perth Basin. Minerals and Energy Research Institute of
Western Australia in association with Ampolex, Arrow Petroleum, Petrofina,
Petroz & WAPET. 1991-1993. With J Scott and R. Young.
Three-dimensional structure of Western Australian greenstone belts from
gravity and magnetic measurements. University of Western Australia Individual
Research Project Grant. 1991
Three-dimensional structure of the Southern Cross Greenstone Belt, Western
Australia. Australian Society of Exploration Geophysics Research Foundation.
1991
Geophysical studies of the granite-greenstone terrain at Southern Cross,
Western Australia. Australian Research Council (small grants scheme). 1992.
With A Trench
Geophysical and geological studies of a probable meteorite impact structure in
the Perth Basin, Western Australia. $9,000 Australian Research Council (small
grants scheme). 1992. With A.W.R. Bevan (WA Museum)
Structural and depositional controls on Pb-Zn mineralisation, Lennard Shelf,
Canning Basin, Western Australia. $115,000 Minerals and Energy Research
Institute of Western Australia in association with BHP Minerals & Cadjebut J.V.
1993-1995. With J.R. Vearncombe, D.I. Groves, P.E. Playford (Geological Survey
of Western Australia)
Analogue structural modelling applied to mineral and petroleum exploration.
$119,401 Australian Research Council (collaborative research grant with
Western Mining Corporation). 1992-94. With L.B. Harris.
Joint inversion of gravity and magnetic data. $1,800. Australian Society of
Exploration Geophysics Research Foundation. 1994.
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Development of a computer programs for an introductory course in geophysics.
$7,500. The University of Western Australia, quality review funding initiative in
computer-based teaching and learning applications. 1994.
Datum elevations from global positioning system and gravity measurements.
$8,000 Australian Research Council (small grants scheme). 1995. With W.E.
Featherstone (Curtin).
Geophysical exploration for aquifers in palaeochannels in the Western
Australian goldfields. $84,000 APA(Industry) supported by Western Mining
Corporation. 1995-1997.
An Integrated Geodesy Research Laboratory. $100,000 Australian Research
Council (Research Infra-structure and Equipment Facilities Programme). 1996.
With W.E. Featherstone (Curtin) and C. Rizos (UNSW).
Geophysical and geodetic studies to determine controls on the distribution of
earthquakes in southwestern Western Australia. $15,008 Australian Research
Council (small grants scheme). 1996. With W.E. Featherstone (Curtin).
A strategy to make exploration geophysics viable by the 21st century. $30,000
Australian Research Council (special initiatives). 1996-1997. With C. McA.
Powell, N. Uren (Curtin) and J. McDonald (Curtin).
Application of wavelet transforms to processing and interpretation of
aeromagnetic data. $84,000 APA(Industry) supported by World Geoscience
Corporation. 1997-1999. With R.D. List (Dept of Mathematics, UWA).
Textural filtering of geophysical data. $14,454 Australian Society of Exploration
Geophysics Research Foundation. 1997-1999. With R.R. Hillis (Adelaide)
Joint inversion of 3D IP and MT data incorporating EM coupling effects. $19,900
Australian Society of Exploration Geophysics Research Foundation. 1997-2000.
With A. Endres and R. D. List (Dept of Mathematics, UWA).
Texture-based enhancement and classification of aeromagnetic data. $44,360
Minerals and Energy Research Institute of Western Australia in association with
Aberfoyle Ltd, North Ltd, Normandy Exploration Ltd, Newcrest Mining Ltd,
Pasminco Exploration, WMC Resources, Geological Survey of Victoria, RGC
Exploration Pty Ltd, & BHP Research. 1998-1999. With D.R. Cowan (consultant).
Texture-based enhancement and classification of aeromagnetic data. $180,000
Australian Mining Industry Research Association in association with Aberfoyle
Ltd, North Ltd, Normandy Exploration Ltd, Newcrest Mining Ltd, Pasminco
Exploration, WMC Resources, Geological Survey of Victoria, RGC Exploration Pty
Ltd, & BHP Research. 1998-1999. With D.R. Cowan (consultant).
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Resolution of the sub-surface structure of the Hamersley province by multichannel seismic reflection. $380,000 Minerals and Energy Research Institute of
Western Australia in association BHP Iron Ore & Robe River Iron Associates.
1998-2000. With C.McA. Powell and P. Cawood (Curtin).
Processing and interpretation of a deep seismic reflection profile through the
Hamersley iron ore province. $249,411 Australian Research Council (Strategic
Partnerships with Industry, Research and Training Programme). 1998-2000.
With A. Long.
Inversion of Potential Field Data. $16,600 Australian Society of Exploration
Geophysicists Research Foundation. 1998-2000. With R.D. List and L. Noakes
(Dept of Mathematics, UWA).
Edge-detection in geophysical data and its utilisation in mineral exploration.
$18,050 Australian Society of Exploration Geophysicists Research Foundation.
1999-2001. With D.I. Groves
4D inversion of the conductivity structure of the earth from broadband induced
polarisation measurements and complementary electromagnetic data. $62,268
Australian Research Council (Strategic Partnerships with Industry, Research and
Training Programme). 1999-2001. With A. Endres and R. D. List (Dept of
Mathematics) and M. Zhadanov (Utah).
Depositional and structural history of Devonian carbonate successions in the
Cadjebut Fault Zone, Lennard Shelf (Canning Basin), Western Australia. $62,268
Australian Research Council (Strategic Partnerships with Industry, Research and
Training Programme). 1999-2001. With A.D. George, N.A. Reynolds and N.
Chow.
Neogene deformation styles and reactivation histories of basins along the North
West Shelf of Australia. $62,268 Australian Research Council (Strategic
Partnerships with Industry, Research and Training Programme). 1999-2001.
With M. Keep, M. Fisher and I. Longley.
Defining the link between geophysical signatures and ore deposit models.
$25,000 Australian Society of Exploration Geophysicists Research Foundation.
1999-2001. With D.I. Groves
Teleseismic Studies of the Southwest Seismic Zone, Western Australia. $10,288
Australian Research Council (small grants scheme). 2000.
Upper crustal structure of the Laverton tectonic Zone adjacent to major gold
deposits from seismic reflection profiling. $236,500. Minerals and Energy
Research Institute of Western Australia in association with Placer Dome and
AngloGold Australasia. 2001-2002. With B. Goleby (Geoscience Australia).
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Palaeoseismic studies in WA: Implications for earthquake hazard assessment.
$15,726 UWA grants scheme. 2003.
Geowulf: An inference engine for complex earth systems. $190,000 Australian
Research Council (Research Infra-structure and Equipment Facilities
Programme). 2003. With J.L. Braun, M. Sambridge, A.J. Gleadow, R.W. Brown,
S.Y. O’Reilly, B.R. Minty, C Beaumont and W.L. Griffin.
Latest Jurassic history of the Exmouth Sub-basin, north-west Shelf: Lowstand
deposits of the basal Barrow Group. $142,447. Australian Research Council
(Linkage scheme). 2005-2007. With A. George, D. Lockhart and M. Fittall.
Western Australian Palaeomagnetic and Rock Magnetic Facility. $246,000.
Australian Research Council (Research Infra-structure and Equipment Facilities
Programme). 2006. With Z. Li, M.E. Barley, P.A. Cawood, L.B. Collins, I.C.
Fitzsimons, D.W. Haig, S.A. Pisarevsky, S.M. Reddy, M.T. Wingate, K. Wyrwoll,
Z.Q. Chen and I.M. Tyler
Industrial relevance
Mining industry
Languages
English
Memberships
Australian Society of Exploration Geophysicists
Society of Exploration Geophysicists
American Geophysical Union
Geological Society of Australia
Honours and awards
Louis Cagniard award EAGE 2003 - with A Buckingham and R List
Previous positions
Post-doctoral research fellow, Memorial University of Newfoundland,
Newfoundland, Canada.
Teaching
All aspects of exploration and solid-earth geophysics at B.Sc to M.Sc level
Current projects
Writing a textbook "Mineral Exploration Geophysics for Geologists"
www.adimb.com.br/simexmin2016