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What is scoria used for?

Answer:
In 1768/69 the Cornish Copper Company reclaimed land using crushed slag (scoria) and recycled its smelter waste to create cast building blocks for the docks it built at Hayle. It was also used extensively for the workers' cottages, shops, pubs and civic buildings.
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First answer by Jones1rocks. Last edit by ID0000000000. Question popularity: 23 [recommend question].