[JimSEA]

This article discusses the major Canadian diamond mines, found in kimberlite pipes in cratons formed generally in the mid to late Archean time period. Very old indeed. Also, of this time, you can find a lava type that hasn't been found from later periods - Komatiite which was very hot and flowed like water. The metamorphic remains often host very rich mineral deposits like the largest nickel mine in Australia. It would be something to hunt for in Canada.

[Paladin2]

Is gem quality different from commercial or would that be industrial?

[Squawk 8888]

To all- please ping me to Canadian topics.

Canada Ping!

[Yo-Yo]

If you didn’t know there were diamond mines in Canada, you never watched the first season of Ice Road Truckers.

[mountainlion]

Colorado and Wyoming have diamonds also.

[familyop]

Ouch. It’s really cold up there.

[free_life]

I was trying to find a source in Canada last year for rough uncut Canadian diamonds, found none in Canada (except for very overpriced retail diamonds). Yet rough Canadian diamonds can be had in the US and Europe and rough uncut diamonds can be found in every diamond producing country in the world. What is with Canada?

[Moonman62]

This article discusses the major Canadian diamond mines, found in kimberlite pipes in cratons formed generally in the mid to late Archean time period. Very old indeed.

...

I think something like half of all the gold ever mined comes from a crater within an ancient craton in South Africa.