"After walking into an adit for 700m the temperature was about...

"After walking into an adit for 700m the temperature was about 70 C while the walls were bone dry."

So does this mean the 'thermal gradient' management have proposed is just this anecdotal example? I wonder if natural heat convection flows in the mine atmosphere would have much of an impact on this figure (i.e by inflating the thermal gradient)?

I think they also used some very shallow existing drill holes, did De Graaf mention anything to you, Jukes?