How does a Coal mine function?

Question

How much hotter does a coal mine get the further down you go

Answer 1

Depends on depth and the thickness of the earth's crust in that region. It can get up to 30 degrees hotter than the usual temperature of the ground near the surface so it can be up to 100 degrees. Coal mines have air conditioning to deal with this.

Answer 2

most coal mines in Kalimatang is cut and fill
they are not good for the headhunters tribe living there
the river tend to be polluted ever can not hold long in
a plastic bottle
all underground mine are ventilated by blower air system
just that the deeper u go the near u get to the hot layer of earth