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Gold/Mining/Energy : SOUTHERNERA (t.SUF) -- Ignore unavailable to you. Want to Upgrade?

To: eyewatch who wrote (7088)	5/7/2003 12:02:34 PM
From: VAUGHN	Respond to of 7235

Actually EW If you look at the mag maps on the web site you'll see that many targets appear to be both. While kimberlite is relatively high magnetically, how it shows up on a survey depends on the host rock into which it is emplaced. If that is limestone such as at Jackson Inlet, the pipes will invariably be mag highs. If the rock is a granite or greenstone, pipes are generally lows or neutral. Mudstones (greywacke) which are common up here and of course lake bottom sediments can really confuse the picture. For that reason, not many players look at mag alone. More often than not, a mag map will be overlain on an EM survey and tied into a geochemical survey and even a gravity survey, with experts looking for coincident mag lows, EM highs, gravity highs and down ice geochemistry terminating at geophysical features such as lakes or isolated marshes associated with the mag/EM/gravity targets. Even that however, can be misleading such as at Yamba where glacial outwash and successive ice ages with differing flows have made a jumble of indicator concentrations and where dike swarms are closely spaced. It can be a head scratcher and when everything is said and done, luck plays a factor too. Having said all that, I have the impression that the targets in and around Kennady Lake may be a little less discrete than they may be around Lac de Gras/Yamba, but that is of course a generalization. We just gots to wait and watch. Regards Vaughn