Arrastras. Historic Gold Mining Method for Processing OreArrastras were used by early miners to crush gold ore so that the valuable metal . made it a valuable tool for the early prospectors to process ore on location,.ore crushing tool of me ico in 1940 s,Aluminium - Smelting - From Mine to Metal Products 1940'sJan 12, 2013 . Mining of the ore to its use in airplanes. Bauxite is mined in Dutch Guiana, shipped to the U.S. processed in a plant. Smelting to metal long.
ore crushing tool of me ico in 1940 s