noun. Worthless rock or other material in which valuable minerals are found.

noun. In mining, the non-metalliferous or earthy minerals accompanying the ore in a vein or mineral deposit; the part of a lode which is not called ore, or which has no commercial value; veinstone.

noun. In mineral analysis, the foreign material or impurity present with the mineral under examination.

noun. The mineral or earthy substance associated with metallic ore.

noun. The earthy waste substances occurring in metallic ore.

"The gossan is likely to resist erosion and to be conspicuous at the surface, -- though this depends largely on the relative resistance of the wall rocks, and on whether the gangue is a hard material like quartz, or some material which weathers more rapidly like limestone or igneous rock."

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