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Surface mining is defined as the extraction of ore from an open pit or burrow. Surface mining is sometimes known as open-pit, open-cut or open-cast mining and is only commercially viable if the deposit is located relative close to the surface. Less than 20% of Alberta's bitumen reserves
A group of northeast Iowans effectively is keeping large frac sand mine companies from mining silica-rich sand in their county by building a consortium that set aside politics and focused on dealing with the matter locally, instead of with state intervention. Allamakee County — a rural county in ...
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.