Figure 14. Alteration effects at the Fetais deposit: calculated mass changes in Fe (in wt %). Major zones of Fe addition occur within the rhyolite A footwall to the main orebody, and also downdip of this, in the area of an inferred synvolcanic fault that may have bounded a sulfide depositional graben. Holes FS-13 and LC-3 have not been sampled.

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