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Slag

The fused or partially fused concentrate of byproducts leftover from the smelting of metal

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Skarn

A metamorphic rock mass formed at the intersection of two large igneous masses

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Silurian

A period within the Paleozoic era, 440 to 400 million years ago

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Silt

Settled concentrations of sediment usually under an aqueous body

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Sill

A mass of igneous rock intruding between older rock strata

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Sodium cyanide

A chemical agent used to liquefy gold and silver for the purpose of refinement or possible transportation

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Silicosis

A mass of igneous rock intruding between older rock strata