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TitleStructural controls on geometry and ore distribution in the Lalor auriferous VMS deposit, Snow Lake, west-central Manitoba (part of NTS 63K16): preliminary results from underground mapping
AuthorCaté, A; Mercier-Langevin, P; Ross, P S; Simms, D
SourceManitoba Science, Technology, Energy and Mines, Manitoba Geological Survey, Report of Activities 2014, 2014 p. 104-115 (Open Access)
LinksOnline - En ligne
Alt SeriesEarth Sciences Sector, Contribution Series 20140263
PublisherManitoba Geological Survey
File formatpdf
AreaSnow Lake
Lat/Long WENS-100.2500 -99.8750 56.8869 54.7500
Subjectsstructural geology; metallic minerals; economic geology; structural controls; volcanogenic deposits; sulphide deposits; gold; alteration; mineralization; deformation; greenstone belts; metamorphism; hydrothermal alteration; Lalor deposit; Trans-Hudson Orogen; Precambrian
Illustrationslocation maps; geologic sketch maps; cross-sections, structural; structural diagrams; photographs; stereonets
ProgramTargeted Geoscience Initiative (TGI-4), Volcanogenic Massive Sulfide Ore Systems
The Lalor volcanogenic massive-sulphide deposit is the largest deposit in the Snow Lake mining camp and is also the richest in terms of total contained Au. The deposit is affected by polyphase deformation that has strongly influenced the geometry of the ore zones and the distribution of metals. Underground mapping has been completed at several selected locations in the mine to document the effects of deformation on the geometry of the deposit. Two regional deformation events (D2 and D3) strongly influenced the macroscopic geometry of the deposit, whereas early (D1) deformation features have been obliterated by later events and their importance is still not clear. Local remobilization of some base- and precious-metal sulphide minerals out of the primary massive-sulphide lenses occurred during deformation and led to epigenetic reconcentration of ore. These observations will assist in characterizing the structural setting and geometry of the Lalor deposit.
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 report presents results of underground structural mapping undertaken at the Lalor project in northern Manitoba as part of the Geological Survey of Canada¿s (GSC) Targeted Geoscience Initiative 4 (TGI-4) program¿s VMS project. The content focuses on the style, geometry, and timing of the tectonic deformation and structural features that affect ore distribution and grade. The objective is to improve exploration methods and models gold and base metal deposit in Canada.