fissure vein


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fissure vein

[′fish·ər ‚vān]
(geology)
A mineral deposit in a cleft or crack in the rock material of the earth's crust.
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The orebodies are stratabound, and consist primarily of fissure veins in the harder beds (limestone, sandstone and dolerite) and metasomatic replacements in the limestones.
Previous work focused on Victoria No.1 Zone (sub-parallel zone 300 m to the north) where 'high sulphide' rock samples returned assay values of up to 2.75% Co and 164 g/t Au from fissure veins. The Victoria No.3 is interpreted as the west extension of the Rocher Deboule No.4 Vein fissure, which accounted for most of the historic production (1915 to 1954, 123,395 tonnes produced 2,653,086 grams of silver, 157,226 grams of gold, 2,840,966 kilograms of copper, 341 kilograms of lead, 34,692 kilograms of tungsten and 3,274 kilograms of zinc).
The project hosts gold-bearing high-angle fissure veins and replacement zones within surrounding carbonate rocks.
In the boom that followed, mining entrepreneurs focused on extracting large hunks of native copper--i.e., almost pure copper, not combined with other elements--from fissure veins that often outcropped on the surface.
Stratabound Mississippi Valley-type fissure veins (in the harder beds) and replacement orebodies (flats) have been emplaced within this geological framework (mostly in the unit called the Great Limestone) by low-temperature metal-rich brines.