Quote Originally Posted by RESiNATE
I guess I was a little off the mark lol

The world's deepest cave system only extends about a mile downwards. The Taratoga gold mines of South Africa could take you close to the 2-mile mark, but your best bet is to start tunnelling from the Mariana Trench. This is the deepest ocean trench, plunging 7 miles (11km) down under the Pacific Ocean.
Howdy RESiNATE,

Okay,I understand now,what you were talking about..tha's mighty deep,for a mine . Whereas,I was talking about drilling depth,with the typical hole in the Austin Chalk,in South Texas,being around 10,200ft -11,100ft max..5286 ft,is one mile. It generally took us about 5 hours to round-trip a drill-bit at that depth..the heat from the earth at that depth,made the drill-pipe and drill-collars,nice and warm in the winter-and miserably hot and steamy-any other time..lol.

Have a good one...Torog