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TitleThe Paleoproterozoic Lalor Auriferous VMS Deposit, Snow Lake, Manitoba: Geology and Geochemistry of the Host Rocks and Hydrothermal Alteration Zones
AuthorCaté, A; Mercier-Langevin, P; Ross, P -S; Duff, S; Hannington, M; Dubé, B; Gagné, S
SourceManitoba Mining and Minerals Convention 2013, abstracts; 2013 p. 1
LinksOnline - En ligne
Alt SeriesEarth Sciences Sector, Contribution Series 20140452
MeetingManitoba Mining and Minerals Convention 2013; Winnipeg; CA; November 20-22, 2013
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 Lalor auriferous Zn-Cu-Ag VMS is the largest deposit of the Snow Lake camp with reserves of 15.1 Mt at 7.2% Zn, 0.6% Cu, 1.9 g/t Au and 23.3 g/t Ag and resources of 12 Mt at 2.6% Zn, 0.9% Cu, 4.0 g/t Au and 27.8 g/t Ag. The deposit consists of highly-strained, stacked massive to semi-massive Zn-Cu±Au, Au-Cu and Au zones that are hosted in intensely and extensively altered volcanic and intrusive rocks. Most of the primary features in the footwall succession were obliterated by superimposed hydrothermal and tectonometamorphic events. However, using detailed mapping of mineral assemblages and structural fabrics in conjunction with extensive lithogeochemistry along a number of key sections makes it possible to precisely map the lithological units and the nature and distribution of hydrothermal alteration zones. Preliminary results indicate that several distinct mafic to felsic units of tholeiitic to calc-alkaline affinities are present in the host succession. These units were subjected to complex, multiphase hydrothermal events responsible for Mg-, Fe-, K- and Ca-bearing alterations and Ca metasomatism of varying intensity and distribution. The important gold endowment and the unique geologic characteristics of the Lalor deposit represent an ideal case to document and better understand gold enrichment processes in the VMS environment.