For factory buildings, I usually try to find out what a building does, what is being processed, what is being made.

I'm trying to find something in real life that is close to what I'm trying to replicate.

So for a miner, for instance, I would try to listen to how a miner would sound in real life.

And usually the case is that

Yeah, this sounds like shit in real life, and no one would ever want to listen to it.