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Re: dougthehead post# 35029

Thursday, 01/08/2009 11:34:03 PM

Thursday, January 08, 2009 11:34:03 PM

Post# of 165854
Well, it's really not all that scientific, but the idea is to get an "undisturbed" sample. Meaning that you don't stress the substrate. You want to make sure you're logging the right material at the right intervals. That's why, with hard rock, you see them sawing the cores in half. What's in the inside of the core hasn't been stretched or strained during the drilling process.

Basically, you start at the overburden (leaves and shit). There are several types of drills, but for core samples, you use a hollow sleve that is split across the center and flaps open (the sleeve is 2 pieces...looks like this ()

They are probably using 15 foot sleeves, but they come in different lengths. The first sleeve is drilled into the ground by the hammer. It goes pop, pop, pop, really fast and drills that bastard into the ground. Picture sticking a straw into some mud....mud goes inside, mark off the foot intervals, log what you see when you split open the sleeve.

Then you put the sleeves all back down the hole, screwing them back in to one another (there is a male and female end on each sleeve). Push that thing down another 15 or 20 feet, pull it back out, split it, log it, do it all over again.

It's not very scientific. The part that takes the longest time is the analysis of the ppm of each mineral in a sample(ppm = parts per million).