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Gold/Mining/Energy : Donner Minerals (DML.V) -- Ignore unavailable to you. Want to Upgrade?

To: VAUGHN who wrote (8861)	11/7/1998 6:51:00 PM
From: Terence Mitchell	Read Replies (1) \| Respond to of 11676

Hi VAUGHN, Thanks for asking, however it is not in my area of Professional expertise therefore I hope 1King or someone like him can make a few comments. regards, Terence Mitchell

To: VAUGHN who wrote (8861)	11/8/1998 12:43:00 PM
From: 1king	Read Replies (1) \| Respond to of 11676

Vaughn, Yes this method is being used at South Voisey except it is through the Crone system. Bill Ravenhurst (Chief GP with Crone) pioneered this technique at our request while working on the deposit in 1996. He has modified the technique somewhat but he published the algorithm two years ago. This new paper is a relatively old concept probably rehashed for political reasons, there are some good examples from 1996 with the Crone system but there is some politics at play with the INCO/VBN author being an ex-Crone employee. The Crone procedure is something like: Last Step(LS)= Primary pulse(PP)+ ch11+ ch14+ Ch16+ Ch17+ Ch18+ 2(Ch19)+ 2(Ch20) I have explained the channel concept in an earlier post. The PP is measured in the "on-time" or in the "ramp". The ramp being the "switch-off" (i.e the very brief transient between power-on and power-off). This on-time measurement is similar to the UTEM system which is considered an on-time method. The purpose is to detect a theoretical "superconductor". These metallic bodies have such a high conductivity that the induced current will not decay (what is measured in the survey) over the measurement "window". Reading in the on-time allows the detection of such "superconductors". There are other rare examples (Watts, 1997) where an orebody (i.e. conductor) was not apparent in the "off-time" data but apparent in an "on-time" measurement (Crone and UTEM systems). Reading in the on-time requires that the loop geometry be well-know and accurate (i.e. X Y and Z coordinates wrt the collar location). This adds time and expense to the survey and was one of the primary reasons for the success on the off-time pulse systems (cheaper and quicker). Any other questions? 1King