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gossan

[gos-uh n, goz-]
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noun
  1. a rust-colored deposit of mineral matter at the outcrop of a vein or orebody containing iron-bearing materials.
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Origin of gossan

1770–80; orig. dial. (Cornwall) < Cornish, derivative of gōs blood; akin to Welsh gwaed
Also called iron hat.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for gossan

Historical Examples

  • What is left is either iron oxide, “gossan,” or the oxides of the other metals.

    Getting Gold

    J. C. F. Johnson

  • What is left is either iron oxide, "gossan," or the oxides of the other metals.

    Getting Gold

    J. C. F. Johnson

  • The gossan does not often carry much value, though it may show traces of minerals which suggest what may be found below.

  • These iron-stained rocks are variously called the "gossan," the "iron capping," the "colorado," or the "eiserner Hut" (iron hat).

  • The ore in the gossan is very generally more valuable than it will be below, and this is especially true of gold and silver ores.

    The A B C of Mining

    Charles A. Bramble