Changes

The precious metal containing products and materials submitted into the refining process are generally called precious metal scrap <xr id="fig:Examples of precious metal scrap"/> (Fig. 11.2). They are usually classified into three categories which differ by the refining processes employed and by the cost-to-value ratio. <figure id="fig:Examples of precious metal scrap">[[File:Examples of precious metal scrap.jpg|right|thumb|Examples of precious metal scrap]]</figure>