The Homestake mine underground tour will split into two groups. One group will go down the Yates shaft to the 4850 level and then go down #6 winze to the 7400 level. The other group will go down the Ross shaft to the 3650 level and visit stopes in 9 and 11 ledges. These two areas exhibit higher gold grades, greater ore continuity, and larger stope areas than are found in typical mining areas. Both areas use selective mechanized cut and fill mining. The stopes to be visited are above the levels illustrated in Figures 1 and 2, and will be accessed through ramp systems.
The style of mineralization in both areas is typical of the Homestake mine (Noble, 1950). Ore is confined to the Homestake Formation (Hf) and occurs within fold noses and limbs. Ore is dominantly siderite-chlorite-quartz schist with pyrrhotite, arsenopyrite, and locally native gold. A variety of quartz veins with variable chlorite alteration locally remobilize gold.