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TitlePetrophysical signature of gold mineralization and alteration assemblages at the Canadian Malartic deposit, Quebec
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorEl Goumi, N; De Souza, S; Enkin, R JORCID logo; Dubé, B
SourceTargeted Geoscience Initiative 4: Contributions to the understanding of Precambrian lode gold deposits and implications for exploration; by Dubé, B (ed.); Mercier-Langevin, P (ed.); Geological Survey of Canada, Open File 7852, 2015 p. 127-138, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative 4: Contributions to the understanding of Precambrian lode gold deposits and implications for exploration
File formatpdf
NTS32D/03NE; 32D/06; 32D/07
AreaRouyn Noranda; Lac Chassignolle; Malartic
Lat/Long WENS -79.5000 -78.5000 48.5000 48.1667
Subjectseconomic geology; hydrothermal deposits; hydrothermal alteration; mineral occurrences; mineral deposits; mineral potential; mineralization; gold; volcanogenic deposits; sulphides; sulphide deposits; Archean; mineral deposits genesis; petrophysics; magnetic interpretations; electrical properties; Abitibi Greenstone Belt; Malartic Deposit; Precambrian; Proterozoic
Illustrationslocation maps; plots; histograms
ProgramTargeted Geoscience Initiative (TGI-4) Gold Ore Systems
Released2015 06 11; 2023 03 17
AbstractThe rock physical properties of samples from the Canadian Malartic gold deposit in the Abitibi greenstone belt of Quebec have been measured to relate lithology and alteration assemblages to physical properties contrasts, and to provide geological interpretation of geophysical survey analyses for this type of ore deposit. Disseminated gold deposits are seldom directly characterized by a clear geophysical signature. However, we propose that a geophysical characterization of such ore deposits can be achieved by combining cost-effective geophysical surveys to identify zones of interest for gold exploration. This study has shown that the metasedimentary rocks and porphyritic intrusions that host the gold mineralization show similar variations in rock physical properties, probably because both rock types have similar geochemical and mineralogical compositions. However, the intrusive rocks show both magnetic and non-magnetic phases, and have a slightly lower density than metasedimentary rocks. Hydrothermal alteration produced continuous trends for magnetic susceptibility, density, and electric chargeability, but with no apparent variation in magnetic remanence and resistivity. These trends of decreasing density and magnetic susceptibility and increasing chargeability are correlated with alteration facies (carbonate saturation index), gold concentration, and proximity to ore. Based on this correlation, a principal component analysis petrophysical proxy has been established to represent this gradual hydrothermal mineralization process. This petrophysical proxy is a valid estimation of the variability of the rock physical properties inside the actual pit area of the Canadian Malartic deposit. Based on composite geophysical surveys (gravity, magnetic, and induced polarization) and inversion of the surface data for rock physical properties at depth, a petrophysical proxy, such as presented here, could help target zones of interest for orebodies similar to that at Canadian Malartic.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI-4) is a collaborative federal geoscience program that provides industry with the next generation of geoscience knowledge and innovative techniques to better detect buried mineral deposits, thereby reducing some of the risks of exploration. This volume summarizes 18 research activities completed under the TGI-4 lode gold ore systems project that focused on lode gold deposits in ancient, deformed and metamorphosed terranes mainly located in the Superior and western Churchill geological Provinces.

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