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The Dome mine, in the Porcupine district of the Abitibi greenstone belt, has produced about 360 metric tons of gold from a variety of ore types in a block of ground 2.5 km long, 1.2 km wide, and 1.4 km deep. The ore zones are hosted in regionally metamorphosed, greenschist facies Archean metavolcanic and metasedimentary rocks. Attention is focused here on two structurally and morphologically different types of gold veins: one concordant with its metavolcanic host rocks, and the other discordant. These veins are exposed together in several parts of the mine, and the latter clearly crosscuts the former....

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