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- W2171472777 abstract "Ester Dome, an upland area near Fairbanks, Alaska, was chosen for a detailed hydrogeochemical study because of the previously reported elevated As in ground water, and the presence of a large set of wells amenable to detailed sampling. Ester Dome lies within the Fairbanks mining district, where gold-bearing quartz veins, typically containing 2-3 volume percent sulfide minerals (arsenopyrite, stibnite, and/or pyrite), have been mined. Ground water at Ester Dome is circumneutral, Ca-HCO3 to Ca-SO4 type, and ranges from dilute (specific conductance of 48 μS/cm) to mineralized (specific conductance as high as 2070 μS/cm). In general, solute concentrations increase down gradient. Redox species indicate that the ground waters range from oxic to suboxic (low dissolved oxygen, iron reduction, no sulfate reduction). Waters with the highest Fe concentrations, as high as 10.7 mg/L, are the least oxygenated. Dissolved As concentrations range from < 1 to 1160 μg/L. Arsenic concentrations are not correlated with specific conductance or Fe concentrations, suggesting that neither groundwater residence time nor reductive dissolution of iron oxyhydroxides control the arsenic chemistry. Furthermore, As concentrations do not covary with other oxyanions, HCO3, Mo, F, or U, such that desorption of As from clays or oxides also does not control arsenic mobility. Oxidation of arsenopyrite in the near-surface environment appears to be the primary control of dissolved arsenic in this upland area. Elevated arsenic concentrations are spatially associated with mineralized shear zones and known lode-gold localities. Furthermore, elevated antimony concentrations (as high as 59 μg/L) in some of the waters with high arsenic concentrations is consistent with this interpretation." @default.
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- W2171472777 date "2007-01-01" @default.
- W2171472777 modified "2023-09-27" @default.
- W2171472777 title "ELEVATED ARSENIC IN GROUND WATER, ESTER DOME (ALASKA)" @default.
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