Integrating Petrophysical and Geophysical Data in Forward and Inversion Modelling of Zone 5-8, Raglan Mine, Quebec, Canada

dc.contributor.authorMaedel, Robinen
dc.contributor.departmentGeological Sciences and Geological Engineeringen
dc.contributor.supervisorBraun, Alexanderen
dc.date.accessioned2018-02-05T18:34:37Z
dc.date.available2018-02-05T18:34:37Z
dc.degree.grantorQueen's University at Kingstonen
dc.description.abstractRaglan Mine is located on the Ungava peninsula, Québec, Canada. It’s a Ni-Cu-PGE magmatic sulphide deposit undergoing brownfield exploration. Given the available data from Raglan Mine and the underutilization of geophysical data integration in mineral exploration, this thesis’ purpose is to investigate the utility of data integration. Specifically, four objectives are set to integrate petrophysical and geophysical data in forward and inversion modelling of Zone 5-8 at Raglan Mine. The first two objectives are met through forward modelling a 3D geological model. Magnetic and gravity forward models are compared to observed data. The major outcome establishes a macro-magnetic susceptibility maximum for the ultramafic of 0.31 SI. Vertical gravity modelling shows lows over sediments, and highs over basalts and an intermediate high over the ultramafic. Additionally, the resolvability of ore targets is investigated, showing that these targets are unresolvable using airborne and terrestrial magnetic and gravity methods. These results are incorporated in inversion modelling. Inversion modelling is an optimization problem, which is non-unique, meaning many solutions could fit. This issue is mitigated through constraints from input data and reference models (cooperative inversion). Objectives 3 and 4 are met by running single parameter and cooperative inversions. Outcomes of single parameter inversions show that magnetic inversions are effective in outlining the UM unit to a depth of ~1000-1250m with a cut off of 0.05 SI. Single parameter gravity gradient inversions outline lower density sediments and higher density basalts. The ultramafic is outlined to depths of ~560-910m (cut off 0-0.3 g/cm3) after which ambiguity exists due to density overlap with basalt. Gravity gradient inversions are enhanced through the cooperative magnetic isosurface reference model, which also balances out the impact of the surface geology constraint. The gravity gradient isosurface constraint on the cooperative magnetic inversion causes the ultramafic limbs to diverge. Overall, forward modelling is able to approximate observed data, and single parameter and cooperative inversion modelling are able to position the magnetic ultramafic and higher and lower density sediments and basalts in geologically and geophysically logical locations. This approach has promising applications in other zones.en
dc.description.degreeM.A.Sc.en
dc.identifier.urihttp://hdl.handle.net/1974/23927
dc.language.isoengen
dc.relation.ispartofseriesCanadian thesesen
dc.rightsCC0 1.0 Universalen
dc.rightsQueen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canadaen
dc.rightsProQuest PhD and Master's Theses International Dissemination Agreementen
dc.rightsIntellectual Property Guidelines at Queen's Universityen
dc.rightsCopying and Preserving Your Thesisen
dc.rightsThis publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.en
dc.rights.urihttp://creativecommons.org/publicdomain/zero/1.0/
dc.subjectForward Modellingen
dc.subjectGeophysicsen
dc.subjectMineral Explorationen
dc.subjectInversionen
dc.titleIntegrating Petrophysical and Geophysical Data in Forward and Inversion Modelling of Zone 5-8, Raglan Mine, Quebec, Canadaen
dc.typethesisen
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