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A systematic water-quality study of the Fortymile River and many of its major tributaries in eastern Alaska was conducted in June of 1997 and 1998. Surface-water samples were collected for chemical analyses to establish regional baseline geochemistry values and to evaluate the possible environmental effects of suction-dredge placer gold mining and bulldozer-operated placer gold mining (commonly referred to as “cat mining”). In general, the water quality of the Fortymile River is very good, with low total dissolved solids and only two cases in which the concentration of any element exceeded primary or secondary drinking-water quality standards. In both cases, iron exceeded secondary drinking-water limits. At...
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Album caption: Scanning electron photomicrograph of the bristles on part of an unwashed wheat-head rachis, location A-1, eastern Washington. Adams County, Washington. June 1980. Published as figure 448 in U.S. Geological Survey. Professional paper 1250. 1981. Handwritten notes on album caption: (Photo by L.P. Gough) Index card unavailable.
    map background search result map search result map Scanning electron photomicrograph of the bristles on part of an unwashed wheat-head rachis. Adams County, Washington. 1980. Regional baseline geochemistry and environmental effects of gold placer mining operations on the Fortymile River, eastern Alaska Geochemistry of lithologic units, Fortymile River study area, East-Central Alaska Regional baseline geochemistry and environmental effects of gold placer mining operations on the Fortymile River, eastern Alaska Biogeochemistry of arsenic and cadmium, Fortymile River watershed, East-Central Alaska Selected geochemical and biogeochemical studies of the Fortymile River watershed, Alaska Biogeochemistry, stable-isotopic composition, and feeding habits of Arctic grayling (Thymallus arcticus) in the lower Fortymile River, eastern Alaska Comparative characteristics of natural organic matter in the Fortymile River, Alaska Geochemical processes and geologic framework influencing surface-water and sediment chemistry in the Fortymile River watershed, East-Central Alaska Biogeochemistry, stable-isotopic composition, and feeding habits of Arctic grayling (Thymallus arcticus) in the lower Fortymile River, eastern Alaska Geochemistry of lithologic units, Fortymile River study area, East-Central Alaska Regional baseline geochemistry and environmental effects of gold placer mining operations on the Fortymile River, eastern Alaska Geochemical processes and geologic framework influencing surface-water and sediment chemistry in the Fortymile River watershed, East-Central Alaska Selected geochemical and biogeochemical studies of the Fortymile River watershed, Alaska Comparative characteristics of natural organic matter in the Fortymile River, Alaska Scanning electron photomicrograph of the bristles on part of an unwashed wheat-head rachis. Adams County, Washington. 1980. Biogeochemistry of arsenic and cadmium, Fortymile River watershed, East-Central Alaska Regional baseline geochemistry and environmental effects of gold placer mining operations on the Fortymile River, eastern Alaska