Controls on Heavy Metal Mobility at the Pecos Mine Operable Unit, New Mexico
Berger, Amy Carolyn
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Permalink
https://hdl.handle.net/2142/86552
Description
Title
Controls on Heavy Metal Mobility at the Pecos Mine Operable Unit, New Mexico
Author(s)
Berger, Amy Carolyn
Issue Date
1999
Doctoral Committee Chair(s)
Bethke, Craig M.
Department of Study
Geology
Discipline
Geology
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Geochemistry
Language
eng
Abstract
A process model of this drainage shows the main controls on the pH are reaction with local bedrock, limestone conglomerate, and concurrent mixing with tributary streams draining unmined regions. Models that account for both calcite dissolution and mixing of up to three kilograms background water per kilogram of mine drainage water ratio reproduce the observed decrease in aqueous metal concentrations with increasing pH. Contaminant concentrations attenuate via three different pathways: zinc, magnesium, manganese, and sulfate concentrations decrease primarily through dilution; aluminum, copper, and iron precipitate directly from solution as oxide and hydroxide phases; lead adsorbs to precipitating hydroxide surfaces.
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