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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 ...

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    I highly recommend The Fundamentals of Electronic Prospecting be read before reading this article.. All the rules of placer and desert geology apply to gold nugget hunting, and this knowledge should be utilized to establish where gold deposits and nuggets are most likely to be found.

  • Glossary of Mining Terms - Rock, Mineral and …

    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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    “Demandite” is the word used by mineral economists to describe the materials that must be provided— usually by mining— to meet the needs of civilization.