slag heap

A slag heap as defined by the Getty Art and Architecture Thesaurus: Piles of fused refuse or dross separated from metal in the process of smelting; also refers to piles of unwanted tailings or refuse that are the by-products of mining ore, coal, or other substances. Piles of fused refuse or dross separated from metal in the process of smelting; also refers to piles of unwanted tailings or refuse that are the by-products of mining ore, coal, or other substances.