Abstract
The Techatticup Wash in Nelson, Nevada, was investigated to determine if metals Pb, Ba, Ag, Cd, Se, Hg and Cr, the metalloid As, and Hg and CN−in sediments are migrating from historical mine tailings in dry ephemeral wash systems as a result overland flow and transport. The subject site is at an elevation of 2700 ft and is 4 miles upgradient from Lake Mohave, some 647 feet above sea level. Enrichment ratios (ER) were used to determine if historical mining activities are mobilizing geogenic trace elements and CN− in surface sediments. Data indicated that Se, Cr, Pb and As and mining inputs of CN− and Hg have been transported 6000 m down gradient from source areas. It was apparent that trace element and CN− containing sediments are transported down gradient in surface sediments as a result of infrequent storm events. Sediments are clearly affected by historical mining and milling that has released contaminants leading ultimately to their transport in sediments during storm events.
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