—interesting—unless hoist cable spec’s have changed , that depth with single lift is getting close to the limit of a safety factor of 6, IIRC——
Yeah, a single lift surprised me. The original mine had numerous sub levels and, by chasing the high grade veins, looked like a rabbits warren. The old and new mines have a lot of big differences. The source of the copper was in the porphyry deposit but the high grade was in hydrothermal veins. Bornite was a common ore and, at 65% was directly smelted after bringing the grade down actually.