Title

Trace Metal Substitution in and Release from Jarosite

Presenter

Jason Anthony

Abstract

Historical mines are often unregulated and release acidic, metal-rich water known as acid mine drainage (AMD). A common AMD remediation method is neutralization of pH. This causes precipitation of iron oxide minerals and dissolved metals from solution. The stability of trace metal substituted (TMS) iron oxides is not well known. This study investigates the mobility of trace metals, specifically cobalt, as they are substituted into the mineral structure of jarosite, an iron oxide mineral. We describe leach experiments with synthesized pure and Co-substituted jarosite, as well as the character of water and precipitate samples from Blackbird Creek, a mining affected, remediated stream in the Idaho Cobalt Belt. The goal is to understand how Co-substitution affects the stability of jarosite and the feasibility of using synthesized Co-substituted jarosite to model natural Fe-rich precipitates in mining-affected stream sediments.

Faculty Sponsor

Bryn Kimball

Sponsor Department/Programs

Geology

Tracks

Poster Session

Terms of Use

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Location

Cordiner Hall

Presentation Type

Poster

Research Funding Source or OCS Program

Keck Geology Consortium

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Apr 19th, 1:00 PM Apr 19th, 2:00 PM

Trace Metal Substitution in and Release from Jarosite

Cordiner Hall

Historical mines are often unregulated and release acidic, metal-rich water known as acid mine drainage (AMD). A common AMD remediation method is neutralization of pH. This causes precipitation of iron oxide minerals and dissolved metals from solution. The stability of trace metal substituted (TMS) iron oxides is not well known. This study investigates the mobility of trace metals, specifically cobalt, as they are substituted into the mineral structure of jarosite, an iron oxide mineral. We describe leach experiments with synthesized pure and Co-substituted jarosite, as well as the character of water and precipitate samples from Blackbird Creek, a mining affected, remediated stream in the Idaho Cobalt Belt. The goal is to understand how Co-substitution affects the stability of jarosite and the feasibility of using synthesized Co-substituted jarosite to model natural Fe-rich precipitates in mining-affected stream sediments.

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