Geoscience

Diamonds in Manitoba

 

Knee Lake Diamond Occurrence

In 2016, bedrock mapping and sampling by the Manitoba Geological Survey resulted in the discovery of diamonds in the Oxford Lake–Knee Lake greenstone belt of the Superior craton, representing the first confirmed occurrence of diamonds in Manitoba. The diamonds are hosted by Archean sedimentary rocks that may have been derived from coeval lamprophyric volcanism.

For additional information, please download Manitoba Geological Survey Open File OF2017-3: Preliminary geology of the diamond occurrence at southern Knee Lake, Oxford Lake–Knee Lake greenstone belt, Manitoba (NTS 53L15).

 

Kimberlite-indicator Minerals

Sampling of surficial sediments in parts of Manitoba has revealed a wide range of kimberlite-indicator mineral (KIM) suites, with promising results in the Hudson Bay Lowlands, southwest Manitoba, the northern Superior province, and at Southern Indian Lake in the Trans-Hudson orogen. Among the indicator minerals are garnets of G10 composition (low Ca, high Cr; potentially derived from diamond-forming regions in the mantle), which were recovered in samples from the northern Superior province and from areas underlain by Mesozoic bedrock in southwest Manitoba. KIM sampling programs are ongoing in several parts of the province to expand and improve the data coverage.

 

Manitoba Kimberlite-indicator Mineral Database (Version 3.2)

by G.R. Keller
Released date: May 6, 2019
Zipped Microsoft® Access 2016 database, 2.5 MB
Supersedes OF2003-3, OF2004-1, OF2004-2 and OF2004-25
 

Click to enlarge outcrop photograph of pelletal lapilli (arrows) from the diamondiferous polymictic conglomerate, Knee Lake

Outcrop photograph of pelletal lapilli (arrows) from the diamondiferous polymictic conglomerate, Knee Lake (click image to enlarge).

 

Click to open PDF of KIM distribution overview

Kimberlite-indicator mineral data in Manitoba (click image to enlarge).


This searchable database contains a compilation of results from all available, non-confidential, kimberlite-indicator mineral surveys completed in Manitoba. The database houses sample location, sample preparation and reference data as well as microprobe analyses of heavy mineral grains. The database can be searched by geographic area and/or mineral or chemical attributes using basic database search techniques.

Download version 3.2

Information on previous database versions:

Version 3.1.1
This database included data from De Beers Canada Exploration Inc. as well as data from Indicator Explorations Ltd., Kennecott Canada Explorations Inc. and the Erik Nielsen 2002 Hudson Bay Lowland survey. Version 3.1.1 was a data ‘fix’ version, resolving a data issue found with OF2002-1 and GP2002-1.
Version 3.0
The database included data from De Beers Canada Exploration Inc. as well as data from Indicator Explorations Ltd., Kennecott Canada Explorations Inc. and the Erik Nielsen 2002 Hudson Bay Lowland survey. Version 3.0 featured a customised query form providing additional query options to facilitate searching as well as the ability to create and view Shapefiles from queried data.

 

Manitoba's Integrated Anomaly Map

Compilation of structural, topographic, potential field and geologic data focussed toward identifying deep crustal structures and occurrences of kimberlite. More details

 

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