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

To: Chas. who wrote (5584)	4/3/1998 9:17:00 PM
From: George J. Tromp	Read Replies (4) \| Respond to of 26850

I think I should jump in the car and head North huh., Crystal Falls., say doesnt Kennecott Minining have their main office there. I dont know for sure. Well., Walt is probably better versed at describing Kimberlite varieties., I think he has seen about everyone in the book. weathered kimberlite breaks down into Serpentine., so it is soft in nature. Ultramafic rocks are generaly dark volvcanic rocks that are over 90% composed of dark material. Picrite being one represenative of Ultramafic rocks main components are pyroxene and olvine., with combinations of honblendes., biotite., and magnetites. Secondary alterations of minerals in picrites alter them to serpentine and chlorites., so grey to black picrites can take on black and greenish tints. Kimberlite is believed to be either picrites or a picrite derivative with texture fine to medium grain but not always., and is usually fragmented with colors varying from greenish to grey-bluish. So the major components of kimberlite are olvine., pyroxenes and phlogopite. During kimberlite emplacement many times xenoliths occupy a portion of the kimberlite. Wall rock can play havoc in kimberlite emplacement. So what you would like to see in these companies reporting kimberlite intersections are pure kimberlite without wall rock., xenoliths diluting the cores. Walt could probably detail the differnt types and the reasons better than I but I think you will find there are many types., each deposit may have its intrinsic and geologic models inherent to the host rocks the intrusions emplaced. When I have more time., we will go over group I and group II kimberlites and what some of the general characteristics to both. Sincerely George J. Tromp

To: Chas. who wrote (5584)	4/3/1998 10:42:00 PM
From: peter bullock	Read Replies (2) \| Respond to of 26850

George is right about the various characteristics of kimberlite, the fact is that every kimberlite is different and characterizing kimberlite is often very difficult. It has many different colours and appearances. Orangeite, or Type II kimberlite is only found in Africa to date. They will find some elsewhere, its only a matter of time. Generally kimberlite near the surface is weathered and it is extremely friable while kimberlite at a depth of only a few feet is fairly hard unless there has been a lot of groundwater penetration. The colour of a typical kimberlite seems to changes from a bluish colour to a greenish colour once its expose to the atmosphere. Permafrost likely restricts groundwater penetration at depth at Snap. Also a dike of any size is as good or better than a pipe if diamond yields are sufficient. The cost of mining a dike in the NWT is an issue that we need to explore in more detail. I suggest visiting the following site for information on dikes verses pipes: southernera.com Windspear is on the verge of announcing that they have a minable resource and once established it will provide a lucrative cash flow that will allow them to search for any pipe that might exist in the area at their leisure (and to do considerable exploration anywhere else they choose). They are more likely to extend the dikes at Snap Lake for considerable more distance than what they have already and depending on how easy it is to get at, this will likely prove to be as profitable or more profitable than any pipe that they might find particularly if it is located in the middle of the lake. Anyone waiting for a pipe may well miss the bus. Peter and long time lurker on this thread