Detection of evidence of a big, underlying intrusive mineral system may have drawn BHP into the neighbourhood at Riqueza in central Peru. But it’s been Inca Minerals’ rapid escalation of the high-grade zinc, silver, lead and copper potential in and around old manto, breccia and vein-tapped workings that has kept small investors enthralled over the past year or so. Drilling now in progress could take that fervour to another level in the months ahead as results start to flow into the public arena.