Still, the sound issue which was the point of the OP still stands, who in the local planning / zoning board let something as noisy as a mining farm get thought.
I wanted to know what it sounded like so I did a little google searching on youtube and found this video:
https://www.youtube.com/watch?v=0aWmPzgpv6kAt least this reporter made an effort to show what it sounds like. It sounds like a big buzzing noise!
Question: If the noise is so bad, how do the employees of the mining facility make it through the day? Are they all working remotely or something or maybe they wear huge ear muffs??