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Gold/Mining/Energy : Winspear Resources -- Ignore unavailable to you. Want to Upgrade?


To: brian krause who wrote (15122)2/23/1999 10:23:00 AM
From: teevee  Read Replies (1) | Respond to of 26850
 
Brian,
I will try and answer your questions:
1. A new cluster of pipes may be found on the Hilltop claims, adjoining the Snap Lake property to the south. I suspect that these pipes will likely be composed of type II kimberlite, like the MPV pipes and the cone sheet at Snap Lake, or the Finsch pipe owned by DeBeers in South Africa. I doubt another cone sheet will be readily discovered....It takes a very special set of circumstances for a cone sheet(ring dyke)to develop.
2. The cone sheet has better grades, because the magma cooled quicker, there was probably much less breakage of diamond (the emplacement was less violent than in a pipe), there is almost no mixing with and dilution from the host country rock as in a kimberlite pipe, the grades will likely be much much more uniform, or evenly distributed, in contrast to a pipe where diamond is more randomly distributed(this is a point where Kaiser has made a fundamental mistake-applying general knowledge and information about type I kimberlite pipes to type II orangeite ring dyke or cone sheet).
3. A deep seated fault much older than the age of the cone sheet must have preceded emplacement of the kimberlite. There are metamorphosed sediments and volcanics overlying the basement granites at Snap Lake....perhaps the deep seated fault did not penetrate these metamorphic rocks...it is possible that the contact between the basement granites and the metamorphic rocks formed a plane of weakness for the kimberlite to be injected into.