The Alteration Epithermal

Information in this presentation and some formats for the mineral summary charts have been extracted from The Alteration Atlas (Thompson and Thompson, 1996) and the SpecMIN™ software program.

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Epithermal gold deposits occur largely in volcano-plutonic arcs (island arcs as well as continental arcs) associated with subduction zones, with ages similar to those of volcanism. The deposits form at shallow depth,