National Geographic : 1946 Jan
Charles D.Gallagher Through This Big Kennecott Reduction Plant at McGill Pass 18,000 Tons ofCopper Ore Daily Ore cars are tilted bodily in the coarse crushing plant (lower right). Thence the mineral is reduced by fine crushingand isconcentrated byflotation inthe buildings at lower center and left. Smelter and power plant are beside the smoking chimneys. Tailing and slag dumps spread on the valley floor beyond the town (page 36).