Hello Robert!

25 Apr 17 17:16, you wrote to Michiel van der Vlist:

 RB> Don't you mean 2,000 feet? 2,000 meters would be 6,000 feet and that comes
 RB> close to some oil well drilling in Texas.

 Some Googling told me that the deepest Gold mine in SA is 4kM deep. The
 ambient temperature there is 85 deg C. and a lot of ice is pumped down
 the mine, to make working possible.

 As for depth of drilling for Oil, the first well in the Minas field in
 Central Sumatra, where I lived in my youth, produced Oil at a depth between
 650 and 740 meters.

Kees

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