gossan definition

  • noun:
    • An exposed, oxidized percentage of a mineral vein, specially a rust-colored outcrop of iron ore.
    • decomposed rock, usually reddish or ferruginous (due to oxidized pyrites), creating top of the part of a metallic vein
    • Decomposed rock, typically reddish or ferruginous (because of oxidized pyrites), developing the upper section of a metallic vein. Known as additionally metal cap.
    • In mining, the ferruginous quartzose material which frequently types a sizable area of the outcrop of a lode where metallic contents at depths occur chiefly in the shape of sulphids, among which pyrites, a mixture of sulphur and metal, is rarely wanting, and it is often present in variety.

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