OF THE PLATINUM METALS MonE OF OccuRREN0E • • MINING AND CONCENTRATION l\t!ETAT,I,URGY • • • • •...as in the alluvial gold workings of the Choco district, it was usually thrown away as worthless, although...metal, and towards the middle of the 19th century mining was carried on in the town of Quibd6, Colombia...been found in recent years in the Rustenbu1·g district of 8011th Africa. Next in economic importance...free from osmium and alloyed with platinum as platiniridium, but is very rare. Palladium minerals i11clude |
Centennial Ridge Mine, Centennial Ridge Mining District, Albany County, Wyoming, USA