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Magnetic properties, acid neutralization capacity, and net acid production of rocks in the Animas River Watershed Silverton, Colorado

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Abstract

Federal land managers along with local stakeholders in the Upper Animas River watershed near Silverton, Colorado are actively designing and implementing mine waste remediation projects to mitigate the effects of acid mine drainage from several abandoned hard rock metal mines and mills. Local source rocks with high acid neutralization capacity (ANC) within the watershed are of interest to land managers for use in these remediation projects. A suite of representative samples was collected from propylitic to weakly sericitic-altered volcanic and plutonic rocks exposed in outcrops throughout the watershed. Acid-base accounting laboratory methods coupled with mineralogic and geochemical characterization provide insight into lithologies that have a range of ANC and net acid production (NAP). Petrophysical lab determinations of magnetic susceptibility converted to estimates for percent magnetite show correlation with the environmental properties of ANC and NAP for many of the lithologies. A goal of our study is to interpret watershed-scale airborne magnetic data for regional mapping of rocks that have varying degrees of ANC and NAP. Results of our preliminary work are presented here.

Additional publication details

Publication type Conference Paper
Publication Subtype Conference Paper
Title Magnetic properties, acid neutralization capacity, and net acid production of rocks in the Animas River Watershed Silverton, Colorado
Year Published 2006
Language English
Publisher Environmental and Engineering Geophysical Society
Publisher location Denver, CO
Description 10 p.
Larger Work Type Book
Larger Work Subtype Conference publication
Larger Work Title 19th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems
Conference Title Symposium on the Application of Geophysics to Engineering and Environmental Problems
Conference Location Seattle, WA
Conference Date 04/02/2006
Online Only (Y/N) N
Additional Online Files (Y/N) N