Do we have other prime candidates with potential to explain a motive behind this?
Yeah, China has a long history of not liking their citizens to have the freedom to make their own money and become prosperous. That's the only reason I can think of as to why they'd be banning miners--it sure as hell isn't for environmental concerns. I don't doubt that China has some consideration for the environment, but I don't think this recent action has anything to do with it.
Is Iran one of the only options for the displaced Chinese miners? Are there any other places where they could go and still get relatively cheap electricity and a better regulatory environment? Iran doesn't strike me as a great alternative, but the miners would know better than I would.
I swear I thought some of those Chinese miners were operating with clean electricity, e.g., hydroelectric and so forth. There have got to be ways around these so-called environmental concerns that don't include banning mining altogether. I think it's a corrupt political move, though. I don't think the Chinese government is looking for solutions to what they're calling a problem.