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TitleCharacteristics of Ni-Cu-PGE sulphide mineralization within the 1.1 Ga Midcontinent Rift
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorSmith, JORCID logo; Bleeker, WORCID logo; Liikane, D A; Hamilton, M; Cundari, R; Hollings, P
SourceTargeted Geoscience Initiative: 2018 report of activities; by Rogers, N (ed.); Geological Survey of Canada, Open File 8549, 2019 p. 421-432, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative: 2018 report of activities
File formatpdf
NTS52A/03; 52A/04
AreaPardee Township; Crook Township
Lat/Long WENS -89.7000 -89.2333 48.1667 48.0000
Subjectseconomic geology; tectonics; geochemistry; mineral deposits; nickel; copper; sulphide deposits; base metals; precious metals; mineral exploration; ore mineral genesis; mineralization; ore controls; tectonic setting; rifts; magmatism; intrusions; sills; dykes; sulphur geochemistry; chromium geochemistry; silicates; bedrock geology; structural features; fault zones; faults; lithology; mafic rocks; ultramafic rocks; source rocks; xenoliths; Midcontinent Rift; Crystal Lake Intrusion; Logan Sills; Cloud River Dykes; Mount Mollie Intrusion; Pigeon River Dykes; Cloud River Dykes; Rove Formation; Duluth Complex; Eagle Deposit; Tamarack Deposit; Current Lake Deposit; Marathon Deposit; Coldwell Complex; Current Lake Intrusive Complex; Steepledge Intrusive Complex; Quetico Metasedimentary Belt; platinum group elements; Precambrian; Proterozoic
Illustrationsgeoscientific sketch maps; cross-sections; stratigraphic columns; geochemical profiles; photographs
ProgramTargeted Geoscience Initiative (TGI-5) Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5) Nickel-copper-PGE-chromium ore systems - deposit controls in cratonic areas
Released2019 03 01
AbstractMagmatic Ni-Cu-PGE deposits of the ca. 1.1 Ga Midcontinent Rift system occur in association with a diverse range of ultramafic-mafic intrusions, from small early rift conduits to large, layered, mafic intrusions such as the Duluth Complex. The nature and style of mineralization is variable throughout these intrusions, some conduit deposits such as Eagle and Tamarack host massive nickel-copper sulphides, whilst others are relatively sulphur-poor but show extreme PGE enrichment (e.g. Current Lake; Marathon Deposit of the Coldwell Complex). The addition of external sulphur (Proterozoic and/or Archean) is considered critical in the formation of many of the Ni-Cu-PGE deposits; however, the key factors controlling the style of mineralization and the base and/or precious metal content are yet to be determined. This research aims to address the processes that are fundamental for metal enrichment and how these may vary both temporally and spatially during the rift's development. Furthermore, the Midcontinent Rift provides an excellent base to study the critical differences between mineralized and unmineralized intrusions, therefore providing the opportunity to assess key controls on metal endowment.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI) is directed towards providing next generation knowledge and methods to facilitate more effective targeting of buried mineral deposits. The program aims to enhance the effectiveness of exploration for Canada's major mineral systems by resolving foundational geoscience problems that constrain the geological processes responsible for the liberation metals from their source region, transportation of these ore metals and control their eventual deposition. TGI supports projects on gold, Ni-Cr-PGE, porphyry-style mineralization, uranium and volcanic- and sedimentary-hosted base metal mineralization ore systems, with each project divided into subprojects focused on resolving specific knowledge gaps by integrating data and studies from multiple sites across Canada. Herein, we present interim results and interpretations from a selection of the research activities currently being conducted under the auspices of TGI.

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