The Pyrola prospect is a volcanogenic massive-sulfide deposit in Triassic(?) felsic to intermediate volcanic rocks, carbonaceous siltstone, argillite, limestone and dolomite (Van Nieuwenhuyse, 1984; Berg, 1984; Newberry and others, 1997). The deposit consists of a 9-meter-thick stratiform layer of massive sulfides with barite and massive barite, interbedded with black argillite. The sulfides are mainly pyrite, sphalerite, and galena with minor chalcopyrite, jamesonite, and boulangerite. The mineralized layer is overlain by a distinctive pyrite-silica rock (halo?) about 0.5 to 6 feet thick. It is underlain by a weakly foliated sericite-quartz-carbonate unit derived at least in part from altered basalt; it contains 5-30 percent disseminated pyrite and veined pyrite. The deposit is probably similar to the Greens Creek Mine (Barnett and Miller, 2003; ARDF JU253) about 8 miles to the north, and like Greens Creek probably has gold and substantial silver values.