The easiest way to use the heat from mining is for space heating or water heating. This will be a very simple and reliable system that does not require much knowledge from the operating personnel. And the more complex and expensive the system, the more problems in the future.
Water heating?
I don't see how the heat from mining will be enough to heat water. Only if it's on a small scale.
Do you know of any concrete reports about this that you can share?
It's hard to find a balance when there are requirements at both ends. You want effective cooling of the equipment and useful heat byproduct.
You can usually only do one effectively. The heat byproduct can be used as a secondary heat source. One example is a drone water tank
that warms water before going into the heated tank. Most drone tanks just use ambient heat to warm the ground water but a little extra
boost from mining waste heat can't hurt. An aquarium or swimming pool might also be a good use.