Abstract

Both porphyry and Temiskaming sediments occur in considerable volume in the Dome mine. At several places rocks are found along their contacts which have the general appearance of porphyry except for numerous, more or less faint outlines which resemble the pebbles in the Temiskaming conglomerate. It is the writer's opinion that these faint outlines represent pebbles in a conglomerate which has been altered by solutions emanating from a magma to a rock which resembles in some degree the porphyry bodies of the mine. The degree to which it resembles the porphyry depends on the extent of the alteration process.

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