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8217049 
Journal Article 
Contaminants, fish, and hydrology of the Missouri River and western tributaries, South Dakota 
Ruelle, R; Koth, R; Stone, C 
1993 
19 
449-480 
English 
Historical mining activities in the N Black Hills discharged contaminants into streams, where they are still present. Elevated concentrations of arsenic and mercury related to ore processing activities were identified in the Whitewood Creek, the Belle Fourche River, the Cheyenne River, and the Missouri River, streams that sequentially flow into each other. Naturally occurring selenium from soil and rock formations was detected at elevated concentrations in sediments or biota from many locations. Other contaminants detected above background levels were arsenic, barium, boron, chromium, mercury, manganese, nickel, and zinc. -from Authors