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Gold/Mining/Energy : Canadian Diamond Play Cafi -- Ignore unavailable to you. Want to Upgrade?

To: rdww who wrote (965)	6/11/2003 10:11:29 PM
From: E. Charters	Read Replies (2) \| Respond to of 16206

Roger Mitchell and Felix Kamsinky say they are lamprophyres. Mitchell was DeBeers a consultant in North America for 25 years. Aside--> Mitchell has defined the rock lamproite and written a book on it (a copy of which I used to own.) He taught that they were defined by their tri-modal mineralogy or the main three minerals that predominate in their major mineral chemistry. Also Lamproite is not a diatremic rock, but a pyroclastic one, and is intermediate to felsic, unlike kimberlite which is ultramafic. Lamproite is a rock that makes up 60% of the butte rock mass of the State of Wyoming. Kaminsky has authored a few papers here and there. I don't know if I would argue with them or even chair a debate, but there is a wide range of opinion out there. The Wawa area was "famous" for two mineralogical feeatures, the pervasive penetrative carbonitization of the rocks, and the ubiquitous distinctive lamprophyre dyke swarms. The lamprophyre dykes usually are brown, and fine grained and do not look like kimberlites at all. There are intrusive micaceous diatreme texture rocks in the area which resemble kimberlites, are very old, and deformed by the proterozoic orogeny of the area. These rocks, at first thought to be kimberlites, are barren lamprophyres, and do not posess subcalic pyrope garnet, which had been found in float in the area. Wawa has also long been famous for the large number of barren intrusive diatremes of alnoitic affinity as well. These were investigated by Mitchell in the late 70's. For these reasons, and because magnetic gabbros and other magnetic features pervade the volcanics regionally, companies were reluctant to spend money to examine the discrete anomalies of the area. The pyrope float, that represents the best chemistry in the North American trough, the widespread chrome diopside, and the drift diamonds do not seem to be related to each other. The drift diamonds may be sourced by the diamondiferous dykes so far found, but this has not been conclusively demonstrated. The quality of the large drift diamonds so far found has been criticised, but this can be discounted. Few diamonds have been found, since field sampling for diamonds have not been saturated, so quality is not a reliable issue statistically. The quality of the chrome diopside found can also be discounted for two reasons. One, the chrome diopside comes from a field and does not have to have a statistical quality that would be associated with an economic pipe, and two, chrome diopside quality is not a reliable indicator of pipe economics, so cannot be used to deny an area or a pipe. It is intersting isn't it that in all the field investigations of diamonds in the territories, we never hear about diamonds being an indicator in float. You would think they would be everywhere. EC<:-}*

To: rdww who wrote (965)	6/15/2003 12:18:13 PM
From: Rocket Red	Read Replies (2) \| Respond to of 16206

Kaiser says Shear ends Churchill's wilderness years Shear Minerals Ltd SRM Shares issued 26,920,727 Jun 13 2003 close $ 1.34 Friday June 13 2003 In the News John Kaiser, writing in a June 13 Tracker, says Shear Minerals (then 96 cents) and Northern Empire Minerals Ltd. have intersected a third kimberlite at their Churchill property -- the third in one week. The letter writer notes that this makes three kimberlites in a row out of 15 magnetic high or low anomalies scheduled for drilling. This kind of success signals that kimberlites model very well as bull's eye magnetic anomalies against the magnetically quiet areas of Churchill. Of the potential 217 targets identified, ground geophysics were conducted on 30 targets; 23 were prioritized as targets. None of the targets is supported by discrete indicator mineral trains because till samples taken last year were too widely spaced to allow such patterns to develop. However, the sampling has yielded a regional composite plot with excellent G-10 chemistry that tells us there is a field of kimberlites present that includes kimberlites with high diamond potential, similar to Ashton's experience in 1997. With the Churchill play stealing the limelight from the Aviat play on Melville Peninsula, the market will gravitate toward the better speculative value offered by Shear.