Figure 1. Plan and sectional views of the distribution of previous and currently mined massive sulfide lenses at Myra Falls. East-west tick marks are at 1000 m spacings. The Marshall Zone, discovered in 1995, lies to the northwest of the other known lenses. Stratigraphically, it is located in the lower portion of the felsic volcanic sequence that overlies mafic to andesitic volcanic rocks of the Price Formation. It therefore lies at a somewhat higher position than the H-W and Battle orebodies, which lie at the Price Formation-rhyolite contact. The position of the Marshall Zone is similar to that of the GAP massive sulfide lens. The Marshall Zone is characterized by higher grades of Zn, Au, Ag and Ba than most of the other sulfide lenses at Myra Falls.

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