Nobody asked for it, but here is an update.
I was redirected to the special uses program manager who is very friendly and gave me a call. Based on our conversation, I don’t think had read the order closely. Unsurprisingly he defending the closure, saying that the Forest Supervisor has the prerogative to close parts of the forest to protect resources. After I pressed him a bit, he admitted that he had looked for the evidence supporting the closure, but had not found it. He said that several consecutive orders had prohibited gold panning, for at least 7 years, and all had been approved by the regional office for legal counsel, but that finding the evidence supporting the original closure order is difficult because there is no digital archive of closure orders.
I mentioned that the Andrew Pickens Ranger district still issues permits and he said “That’s a problem” and “We’ve been trying to stop him”.
His recommendation was that I file a FOIA request to get all the documentation relating to closure of gold panning in the Sumter National Forest, since he isn’t sure that he necessarily has the records in his office.
Overall, the conversation was as expected, maybe better. The guy seems like he cares, and said to feel free to call him back for updates if I don’t hear from him first. The situation still bothers me. Basically for almost a decade they’ve been prohibiting a low impact recreational activity and nobody knows why. Not surprising, I guess. I’m going to follow through of the FOIA and see what we get. It’ll probably be a long time before the next update, unless the helpful man calls me back sooner.