Browsing by Subject "Hydrothermal alteration"

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    Needleboy Lake – Six Mile Lake Geological Mapping Progress Report: June 2003
    (University of Minnesota Duluth, 2003-08) Hudak, George J; Heine, John J; Hocker, Stephanie M; Hauck, Steven A
    Detailed mapping and hydrothermal alteration studies have identified several areas in the Archean Vermilion District of NE Minnesota that have excellent potential to host volcanic-hosted massive sulfide (VHMS) deposits. Over the past three summers, the detailed volcanology, hydrothermal alteration, and VHMS mineral potential have been investigated in the Five Mile Lake, Quartz Hill, Eagles Nest, Skeleton Lake, Needleboy Lake, and Six Mile Lake areas.