Origin of gossan
Examples from the Web for gossan
The gossan does not often carry much value, though it may show traces of minerals which suggest what may be found below.
What is left is either iron oxide, “gossan,” or the oxides of the other metals.
These iron-stained rocks are variously called the "gossan," the "iron capping," the "colorado," or the "eiserner Hut" (iron hat).
What is left is either iron oxide, "gossan," or the oxides of the other metals.
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