8.2.3 Fletcher Mine Backfill Plant
The Fletcher lxlckfill plant is located on the surface (Figures 8.3 and 8.4). The plant consists of a Denver high-intensity mixer, which is fed cement and fly ash stored in 64· and 45-tor.ne bins, respectively. Cement and f!y ash are transferred by screw conveyors to a bucket elevator, which then elevates tht' cement and fly ash to a weigh hopper that feeds the material into the mixer by gravity. Dried, cydoned mill tailings are also fed into the mixer via a conveyor belt from a 45·tonne tailings storage bin. A batching cycle takes 12 min to complete, and batch composition is similar to that produced at the Buick Mine.