For those wanting to tag locations that perform hashing (mining), you should use the following tags:
As described here: Tag:man_made=works.
operator=* - The operator of the datacenter. In the case of a corporate datacenter, this will be the organisation which owns it. In the case of a colocation facility, this will be the colocation company.
name=* - The name of the datacenter.
owner=* - Some datacenters are constructed and owned by one company, but long-term leased in their entirety to another company to operate.