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

To: maintenance who wrote (5139)	2/11/1998 1:05:00 AM
From: Walt	Read Replies (1) \| Respond to of 26850

Diamonds come from kimberlites usually and occasionally from lamprolites. Lamprolites are usually big masses of intruded rock, the argyle mine in australia is a lamprolite. Kimberlites can come in pipes, dykes or sills. A dyke and sill are basically the same thing although a dyke is near vertical and a sill near horizontal, so if it is at 45 degrees it is either. The kimberlite seems to fill a big crack in the rock hence sills and dykes can be quite long but relatively narrow. Because of this the kimberlite cools quickly and the diamonds tend to be preserved. They have a more uniform grade then pipes and carry that grade to depth. When a pipe comes in it fills the cracks in the rock around it forming a series of dykes and sills, so yes they are often associated with pipes. However they do seem to also occur occasionally independent of pipes. On the WSP ground there is the dyke they plan to bulk sample which may or may not be from a pipe. There is the cl125 anamoly where they hit a kimberlite breccia underground but have yet to find a pipe source for it. This is very unusual but since it also contains micro fossils it should have surfaced somewhere. They also have the kimberlite boulders discovered last year.From their location etc it is unlikely they came from the dyke or even cl125. So there should be some pipes in the area probably under snap Lake, it is just a matter of finding them. Maybe the dyke is an off shoot of the pipes, time and drilling should tell. Hope that helps regards Walt