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Gold/Mining/Energy : GOLDEN RULE (tse:GNU)
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To: Jim Steel who wrote (904)11/1/1997 11:23:00 PM
From: Chris  Read Replies (1) of 957
 
Off Topic For J. Ujina
(Your email address is not available in your profile, so I am posting to you on this thread.)

You have stated that you are a great geologist, but a poor investor. Perhaps you can help me with a drill logging question that I was discussing on the Ashton (ACA) thread. I have surfed the net but can only find info on drill technology, not logging techniques.

I have some familiarity with solid core logging, but only a little book learning about borehole logging by analyzing particles in the return well water/mud (often rotary percussion drills).

Specifically, is there greater imprecision with the latter wrt depth of sample? Is it harder to determine that a sample chip came from a depth of 140' versus 160'? Could lighter materials be carried to the surface more quickly than heavier materials, and so distort their apparent place in the stratigraphy?? Or is logging boreholes from the return mud detritus a pretty evolved science that gives quite accurate samples and accurate depth for the samples??
How is the material extracted from return water? Is it continually sieved, and is this material then saved in a series of labelled bags or containers for future use??

Any enlightenment would be appreciated. If you don't know the response, do you have any field geologist friends who could help?

Many thanks.
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