The circulating load practical mineral processing plant design by an old-time ore dresser / Практичная установка для переработки минерального сырья с циркулирующей загрузкой, спроектированная старинным переработчиком руды

We got one of our best ideas concerning primary crushers from a 54- × 74-inch gyratory crusher installed at the Ray Mines division of Kennecott Copper. This crusher had a rubber belt feeder under its surge pocket— one that we believe to be the first ever installed. It was 6 feet wide and about 80 feet long and was also used as a picking belt to remove timbers that came from the old underground mine. The total height of the installation from the belt feeder floor to the top of the dump pocket was 63 feet. The belt, which also handled old drill steel and miscellaneous scrap iron, had a life of about 14 months and handled 10 million tons in  that time. <...>