For example, they may be the ends of rollings or the removed build-up from molten metal ladles, or the trim from a foundry, such as sprues and gates.

For example, Tthey may be the ends of rollings or the removed build-up from molten metal ladles, or the trim from a foundry, such as (sprues and gates) as examples A variety of intermediate impure metals or metal compounds are produced in a non-ferrous smelter.