Dells are made to run 24/7. It's very common for them to do this in a business environment. When I worked as a truck mechanic we had several in the shop that ran 24/7 in the heat (no AC). They were always left on so they could be updated in the early morning hours. But 3 shifts 7 days was usually the schedule. Also the PSU is UL rated to not start a fire in case of failure. I don't know how good it is for mining but for 24/7 it's a good choice.