The rise in POG looks like a simple case of continued heavy buying over many months. There was a correction over Xmas but now the trend is continuing. If the buying is strategic and due in the main to only a few determined buyers (which seems likely) then POG looks to go to $580 over the next few weeks, as a linear rise. We don't kow whether China has a max price in mind or a more complex strategy but if it is simply buying as a policy then there would not appear to be an upper limit (at least, not for a long way yet).
I still feel that leveraged positions of any kind but certainly any derivatives are too dangerous in this market. Almost all of the miners hold large derivative positions themselves, I believe? What happens to the companies/stockholders if those derivatives go belly-up?