Hydrology and Geochemistry of a Surface Coal Mine in Northwestern Colorado PDF Download
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Author: Robert S. Williams
Publisher:
ISBN:
Category : Coal mines and mining
Languages : en
Pages : 72
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Book Description
Author: Robert S. Williams
Publisher:
ISBN:
Category : Coal mines and mining
Languages : en
Pages : 72
Get Book Here
Book Description
Author: Robert S. Williams
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Author: Robert S. Williams
Publisher:
ISBN:
Category : Coal mines and mining
Languages : en
Pages : 116
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Book Description
Author:
Publisher:
ISBN:
Category : Hydrology
Languages : en
Pages : 196
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Book Description
Author: Robert S. Williams
Publisher:
ISBN:
Category : Groundwater
Languages : en
Pages : 218
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Book Description
Author: William P. Van Liew
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 108
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Book Description
Author: Geological Survey (U.S.)
Publisher:
ISBN:
Category : Flood forecasting
Languages : en
Pages : 378
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Book Description
Author: Karen M. Maley
Publisher:
ISBN:
Category : Acid mine drainage
Languages : en
Pages : 262
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Book Description
Author: Tom Brooks
Publisher:
ISBN:
Category : Coal mines and mining
Languages : en
Pages : 36
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Book Description
Author: David W. Clark
Publisher:
ISBN:
Category : Coal mines and mining
Languages : en
Pages : 92
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Book Description
A potential hydrologic effect of surface mining of coal in southeastern Montana is a change in the quality of ground water. Dissolved-solids concen- trations in water in spoils aquifers generally are larger than concentrations in water in the coal aquifers they replaced; however, laboratory experiments have indicated that concentrations can decrease if ground water flows from coal-mine spoils to coal. This study was conducted to determine if decreases in concentrations occur onsite and, if so, which geochemical processes caused the decreases. Solid-phase core samples of spoils, unmined over- burden, and coal, and ground-water samples were collected from 16 observation wells at two mine areas. In the Big Sky Mine area, changes in ground- water chemistry along a flow path from an upgradient coal aquifer to a spoils aquifer probably were a result of dedolomitization. Dissolved-solids concentrations were unchanged as water flowed from a spoils aquifer to a downgradient coal aquifer. In the West Decker Mine area, dissolved-solids concentrations apparently decreased from about 4,100 to 2,100 milligrams per liter as water moved along an inferred flow path from a spoils aquifer to a downgradient coal aquifer. Geochemical models were used to analyze changes in water chemistry on the basis of results of solid-phase and aqueous geochemical characteristics. Geochemical processes postulated to result in the apparent decrease in dissolved-solids concentrations along this inferred flow path include bacterial reduction of sulfate, reverse cation exchange within the coal, and precipitation of carbonate and iron-sulfide minerals.
