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Galena-Bearing Gossans, Beaver Creek, Ruby District, Yukon Region, West-Central Alaska.
Galena-bearing Gossans at Beaver Creek, 14 miles south of the town of Ruby, west-central Alaska, are roughly tabular bodies of irregular thickness composed of limonite and goethite containing galena, quartz, sparse anglesite and cerussite, and inclusions of schist. They occur in two zones, 800 feet apart, enclosed by intensely jointed and fractured schist and phyllite containing siliceous and calcareous bands. The size and shape of the deposits are controlled by premineral faults which nearly parallel bedding and schistosity. Postmineral faults disrupt continuity of the eastern zone. Both deposits stike n 35 degrees e and dip steeply to the northwest. Gossan in the eastern zone has an indicated trace length of 500 feet and rages from 1/2 to 6 feet wide. The largest concentration of metal along this zone was indicated by a channel sample 2.35 Feet long containing, by analysis, 16.13 Troy ounces of silver per ton, 15.3 percent lead, 0.39 percent zinc, 0.02 percent copper, and a trace of gold. In the western zone, the gossan is 3 to 10 feet wide, and the trace is about 300 feet long.
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division