Replies to post #112 on Find Diamonds, Make Money

[echarter]

If you add closed diamond mines and the real number of pipes that Diamet, Tahera and Diavik found that have good grade and would someday be mineable, then you can double your figure. So I am about right in 1 in 50. As a matter of fact back when there was only 3,000 Kimberlite pipes found, there were more than 60 mines that had produced and were in production. There were 23 in South Africa alone, and Russia at the time was the unumber one producer. So 50 to one then mayu have been a fair figure, and now perhaps as well.

It is bad statistics to add to the mix alnoite, sovites, ijolites and the known barren types of lamproite, lamprophyre, alpine peridotite breccias, and minettes. These rocks are known to have a low hit rate for gems, but lamprophyre, long suspected of diamondiferousness in other areas of the world is now a prime suspect due to the discovery of the Wawa dykes which are primarily lamprophyric composition.

It may be that the Canadian pipes are a special dual composition kimberlite, in that some of them appear to be both peridotitic and eclogitic as well. This was a theoretical composition not seen elsewhere. The Archangelisk or Winter Sea field in Russia may be a special type of kimberlite as well.

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