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To: George J. Tromp who wrote (5132)2/10/1998 7:18:00 PM
From: Walt  Read Replies (2) | Respond to of 26850
 
Greetings George et al
Imagine the dyke as a long relative thin plate. Better yet pick a book like an atlas, long wide but thin. The binding of the book shows up at the south side of snap under overburden and the book is tilted so it runs down (north) and probably under snap. They hit the dyke with a number of holes near the binding now they will step out moving the drill towards snap but drilling back at an angle so hopefully they will hit the dyke deeper but at aproximately 90 degrees. (The angle that the dyke dips and the angle of the drill hole back so the two intersect at 90)
The holes will test the dyke deeper and probably be widely spaced to test along strike as well. By plotting up the original holes plus these four they should have a good idea of just how the dyke is lying.
The bulk sample will be taken from the binding where it sits closest to surface. They will clear off the overburden then probably blast down to get the kimberlite. So you will have a big overburden trench with a smaller kimberlite-rock trench at the bottom.
Hope that makes sense,
regards Walt