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Gold/Mining/Energy : Diamonds in Alberta, Ashton, Pure Gold, Montello, New Cla

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To: bill who wrote (638)	6/24/1998 11:41:00 AM
From: Lilian Debray	Read Replies (1) of 822

Hi Bill. This is briefly what I understand on the subject. The gamma-ray signatures of kimberlites are often similar to those of shales and sandstones. Gamma-ray activity relate to variations in concentrations of radioelements such as potassium. Those electromagnetic signals reflect the weathered near-surface layer of kimberlites that is generally weakly conductive. Magnetic signals relate to variations in ferromagnetic minerals such as magnetite and ilmenite. They are generally stronger in the unaltered deeper layers of the kimberlites. Alteration changes magnetic minerals into non-magnetic. Both electromagnetic and magnetic signatures vary greatly with the facies of kimberlite (alluvial, crater, diatreme, hypabyssal) and eruptive phases. ACA and PUG are said to have made good use of Robert Pryde's research on magnetic anomalies. I have found the following article very useful: BOREHOLE GEOPHYSICAL SIGNATURES OF KIMBERLITES IN CANADA C.J. Mwenifumbo, P.G. Killeen and B.E. Elliott Geological Survey of Canada, 601 Booth St., Ottawa CANADA K1A 0E8

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