Figure 13. Cross-section through the Fetais deposit at about 520 NW, based on drillhole logs and chemical definition of the volcanic units. Hole FS-22 is located just down-dip of the main orebody (details of this hole are given in Figure 12). Rhyolite A forms the footwall, while rhyolite C forms the hangingwall immediately above the orebody. The rapid thinning of the main orebody and the disappearance of rhyolite C in the downdip direction may mark the presence of a synvolcanic fault scarp in this area. Holes FS-13 and LC-3 have not been sampled.