I took a look at a one hour PD chart and can offer an opinion (not necessarily a good opinion):
Personally I think it was a decent short at 86 (decreasing) with a stop at 87 or so. Right now the 60 minute chart looks more positive than negative IMO [positive MACD and money flow and some positive divergences (MACD, accumulation and RSI) not confirming the most recent lows].
I'm ambivalent on the stock fundamentally. If you think the copper futures prices are a good estimator of future prices it is undervvalued. If you believe that global economic growth will slow significantly than it is overvalued.