I think this is a reasonable read and explanation of what's going on with gold prices. You bring up a good point about copper which is almost at a one year low. Even though the market is near highs, if you look inside, it's not that healthy. Tech is doing nothing, banking run has been over for a while...it's the staples and yielders that are being run up. And though the overall S&P 500 PE is within hisorical reason, the PEs of some of these run up stocks like HD, MCD, or CLX are getting way out of wac for what they are.
I have been very bullish (from a market perspective) for a very long time. Though I have also agreed with many of the bears on all of the systemic global economic troubles. Though from a market perspective they have been useless bits of data that have been unactionable. But I really believe this gold selloff is an ominous global sign. I certainly will not be buying any gold come Monday and will continue to offload my equities.