Seasonal variation in metal concentrations in a stream affected by acid mine drainage, St. Kevin Gulch, Colorado

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Edited by: Geoffrey S. PlumleeM.J. Logsdon, and L.F. Filipek

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Abstract

Mining of mineral deposits in the Rocky Mountains has left a legacy of acidic inflows to otherwise pristine upland watersheds. Since 1986, the U.S. Geological Survey has studied physical, chemical, and biological processes that affect the transport and transformation of metals in St. Kevin Gulch, an acidic, metal-rich stream near Leadville, Colorado. Well-known chemical processes have been quantified in the context of on-going physical transport by defining the hydrology with instream tracer-dilution experiments. These processes affect the partitioning of metals between dissolved and colloidal transport phases. In this acidic stream, pH increases during snowmelt runoff. At the most acidic stream site, pH varies from 3.15 to 4.00 during seasonal changes. Conservative effects of dilution are quantified using manganese as a natural, conservative tracer. Aluminum, copper, and zinc also are relatively conservative throughout the seasonal changes. Sulfate and iron, on the other hand, are removed with respect to manganese. The loss of iron through precipitation of hydrous Fe oxide is consistent with thermodynamic calculations. The loss of sulfate, however, cannot be fully explained.

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Additional publication details

Publication type Book chapter
Publication Subtype Book Chapter
Title Seasonal variation in metal concentrations in a stream affected by acid mine drainage, St. Kevin Gulch, Colorado
Chapter 22
DOI 10.5382/Rev.06
Volume 6
Year Published 1997
Language English
Publisher Society of Economic Geologists
Contributing office(s) Toxic Substances Hydrology Program, Crustal Geophysics and Geochemistry Science Center
Description 11 p.
Larger Work Type Book
Larger Work Title The environmental geochemistry of mineral deposits: Part A: Processes, techniques, and health issues part B: Case studies and research topics
First page 467
Last page 477
Country United States
State Colorado
Other Geospatial St. Kevin Gulch