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Gold/Mining/Energy : Donner Minerals (DML.V)

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To: Terence Mitchell who wrote (8857)	11/7/1998 3:51:00 PM
From: VAUGHN	Read Replies (2) of 11676

Hello Terence Perhaps you and/or 1King would be prepared to discuss whether this technique is being employed by Teck at SVB or not? ******** Research Paper -------------------------------------------------------------------------------- October 31, 1998 The following paper was submitted to Geophysics on September 30, 1998. Robust estimation of the in-phase response from impulse-response TEM measurements taken during the transmitter switch off and the transmitter off-time: Theory and an example from Voisey's Bay. Richard S. Smith, Geoterrex-Dighem and Stephen J. Balch, Inco Limited. ABSTRACT Modern transient EM systems are now able to take measurements in the transmitter on-time. By combining measurements taken during the transmitter switch-off with those collected in the transmitter off-time it is possible to obtain a robust estimate of the total in-phase response. This total response is comprised of the primary field (which is by definition in-phase) and the in-phase secondary field. If the transmitter loop position is known, and the position and orientation of the receiver dipoles are known, it is possible to estimate the primary field. If this estimated primary is subtracted from the total in-phase response, then an estimate of the secondary in-phase response can be obtained. The secondary in-phase response is extremely useful when exploring for highly conductive bodies, as the response of these bodies is primarily an in-phase response. On- and off-time PROTEM data collected in a drill-hole proximal to the Reid Brook Zone (one of the Voisey's Bay deposits) shows a strong secondary in-phase anomaly corresponding to a previously unmapped conductor. A drill hole targeted to test this conductor intersected 20.4 m of mineralization, including 8.25 m of massive sulphide. Note: For a full version of this paper, please email your request to postmaster@geoterrex.ca, attention Richard Smith. Thanks and Regards

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