On a Friday afternoon in June, the Plaza de Armas in Cajamarca is pulsing with life. It’s winter here, and although thick white clouds hover low in the distance, the sun in this northern Peruvian city is warm. Couples sit on benches facing one another. Kids run in the grass between flowerbeds. Men in suits stride along the perimeter. It’s an idyllic day. But signs of something more ominous are not far from sight. On the mountainside overlooking the town the words Nova Conga have been carved into the vegetation. It is a constant reminder that beyond the square, hemmed with international hotels and expensive restaurants, there is another reality.