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TitleThe Paleoproterozoic Lalor Auriferous VMS Deposit, Snow Lake, Manitoba: Preliminary Observations on the Nature and Architecture of the Hydrothermal System
AuthorMercier-Langevin, P; Caté, A; Duff, S; Hannington, M; Ross, P -S; Gagné, S; Dubé, B
SourceManitoba Mining and Minerals Convention 2012, abstracts; 2012 p. 1
LinksOnline - En ligne
Alt SeriesEarth Sciences Sector, Contribution Series 20130556
MeetingManitoba Mining and Minerals Convention 2012; Winnipeg; CA; November 15-17, 2012
Mediaon-line; digital
File formatpdf
AreaSnow Lake; Lalor
Lat/Long WENS-102.0000 -98.0000 56.0000 54.0000
Subjectseconomic geology; geochemistry; geochemical interpretations; mineral deposits; mineral assemblages; mineralization; gold; volcanogenic deposits; sulphides; deformation; metamorphism; alteration; hydrothermal alteration; volcanic rocks; igneous rocks; Flin Flon Greenstone Belt; Lalor Deposit; Precambrian; Proterozoic
ProgramTargeted Geoscience Initiative (TGI-4) Volcanogenic Massive Sulfide Ore Systems
AbstractThe GSC, in partnership with HudBay, the MGS, the INRS-ETE and the University of Ottawa, and in collaboration with Laurentian University, recently initiated a study of the Lalor auriferous VMS deposit in Snow Lake as part of the Targeted Geoscientific Initiative Phase 4 of NRCan. Lalor is the largest deposit of the Snow lake camp and also the richest in Au with approximately 27 Mt of ore at 2.8 g/t Au (75 t Au). It is predominantly characterized by distinct Zn-Pb-Cu±Au-Ag semimassive to massive sulphide lenses and by zones of Au-Ag-Pb±Cu disseminated sulphides. The ore zones are stratigraphically and/or structurally stacked in a complexly deformed and metamorphosed succession of intensely hydrothermally altered rocks attributed to the Chisel mature arc sequence that host other Zn-rich VMS deposits. Preliminary observations indicate that there are key mineral assemblages that can be traced and possibly used to vector within the Lalor footwall alteration system. Current work aims at refining the zonation and overprinting patterns based on detailed mineralogy, mineral chemistry and lithogeochemistry of the alteration and sulphide mineral assemblages. The overall objective is to identify the critical factors that controlled Au enrichment at Lalor and further advance our understanding of the specific processes controlling precious metal enrichments in VMS systems.

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