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Blende

Yukon Territory, Canada

Main commodities: Zn Pb Ag
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The Blende carbonate hosted Zn-Pb-Ag deposit is located in north-central Yukon Territory, Canada, some 60 km north-east of Keno City.

Mineralisation is spatially associated with a Mesoproterozoic fault system cutting the Mesoproterozoic upper Gillespie Lake Group, part of the Wernecke Supergroup shelf assemblage.   The Gillespie Lake Group is composed of a lower sequence of brown to dark grey dolomite and orange weathering dolosiltite.   The finer grained beds are generally graphitic and contain blebs of pyrite.   This unit gradationally overlies the metamorphosed monotonous succession of dark grey siltstone, mudstone and fine grained sandstone of the Quartet Group.   The Upper Gillespie Lake Group is characterised by the appearance of stromatolitic carbonate, mostly at the top of cyclical shallowing upward carbonate sedimentary sequences.   These are in turn overlain by dark grey siltstone and shale with sandstone and carbonate interbeds that comprise the Pinguicula Group.

Mineralisation takes the form of a largely stratabound, carbonate hosted, zinc-lead deposit.   It is predominantly epigenetic with sphalerite and galena, lesser pyrite and chalcopyrite and traces of friebergite in quartz-carbonate veins and veinlets.   The veins are zoned from copper-silver rich sections at the base through lead and zinc to zinc dominated at the top.   Ore is controlled by both structure and stratigraphy, with many of the stromatolite beds being mineralised and richest in lead and zinc adjacent to faults.

Reserves in 1995 amounted to 20 Mt @ 6% Pb+Zn.

For detail consult the reference(s) listed below.

The most recent source geological information used to prepare this summary was dated: 1995.    
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd.   Unauthorised copying, reproduction, storage or dissemination prohibited.


  References & Additional Information
   Selected References:
Robinson M, Godwin C I  1995 - Genesis of the Blende Carbonate-hosted Zn-Pb-Ag deposit, North-central Yukon Territory: geologic, fluid inclusion and isotopic constraints: in    Econ. Geol.   v90 pp 369-384


Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge.   It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published.   While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo takes no responsibility what-so-ever for inaccurate or out of date data, information or interpretations.

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