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    Back — The roof or upper part in any underground mining cavity. Backfill — Mine waste or rock used to support the roof after coal removal. Barren — Said of rock or vein material containing no minerals of value, and of strata without coal, or containing coal in seams too thin to be workable.

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    separate and capture any mercury, which may have formed compounds. Refining Most commercial-grade mercury is 99.9% pure and can be used directly from the roasting and condensing process.

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