You spotted that one pretty quickly, that's from my blog and I couldn't even find it on seekingalpha yet...!
It's one worth thinking about, there are too many companies in similar situations. Everyone keeps warning investors about investing in countries with so-called "instable political climates" and sure, there are risks to it. But knowing how important the mining sector is for almost any South American country, one has to wonder whether these Governments are actually going to risk losing the multi-billion foreign investments from mining (and petrochemical) companies...
But still, holding this stock is like torture, even if you have faith in a happy ending.