A silver mine. "Pacajake mine" is a common misnomer for this locality. The famous selenium minerals from this locality have often been falsely attributed to the Hiaco mine (2km west, on the opposite flank of Pakajake canyon) or to the Colquechaca mine (28km southwest), but neither of those mines yields any Se minerals at all; error due to the original type specimens of Pakajake Se minerals having been purchased at a shop in Colquechaca unaccompanied by good locality labels, and then published in the literature with incorrect conjecture.
