In article , Martin H. Eastburn
says...

Maybe the data is simply old economics. Diamond drill heads bore through iron
cobalt deposits and
other iron rich layers for many years in well drilling. So maybe research needs
to look at this
again with a different point of view.

I thought that drill heads are continously pumped full of drilling
mud, to carry away the cut material. Because the drills run
immersed in water-based solution I bet the chemistry is a lot
different at the lower temperatures.

Jim


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