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单词 Drift mining
释义

Drift mining

英语百科

Drift mining

Coal miner standing in a drift portal at Fork Mountain, TN, 1920.
Drift mine entry in West Virginia, 1908. Photo by Lewis Hine.
Profile of hillseam occurrence

Drift mining is either the mining of an ore deposit by underground methods, or the working of coal seams accessed by adits driven into the surface outcrop of the coal bed. A drift mine is an underground mine in which the entry or access is above water level and generally on the slope of a hill, driven horizontally into the ore seam. Random House dictionary says the origin of the term "drift mine" is an Americanism, circa 1885-1890.

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