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Impacts of groundwater metal loads from bedrock fractures on water quality of a mountain stream

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Abstract

Acid mine drainage and metal loads from hardrock mines to surface waters is a significant problem in the western USA and many parts of the world. Mines often occur in mountain environments with fractured bedrock aquifers that serve as pathways for metals transport to streams. This study evaluates impacts from current and potential future groundwater metal (Cd, Cu, and Zn) loads from fractures underlying the Gilt Edge Mine, South Dakota, on concentrations in Strawberry Creek using existing flow and water quality data and simple mixing/dilution mass balance models. Results showed that metal loads from bedrock fractures to the creek currently contribute <1% of total loads. Even if background water quality is achieved upstream in Strawberry Creek, fracture metal loads would be <5%. Fracture loads could increase substantially and cause stream water quality standards exceedances once groundwater with elevated metals concentrations in the aquifer matrix migrates to the fractures and discharges to the stream. Potential future metal loads from an upstream fracture would contribute a small proportion of the total load relative to current loads in the stream. Cd has the highest stream concentrations relative to standards. Even if all stream water was treated to remove 90% of the Cd, the standard would still not be achieved. At a fracture farther downstream, the Cd standard can only be met if the upstream water is treated achieving a 90% reduction in Cd concentrations and the median stream flow is maintained.

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  1. US Environmental Protection Agency Region 8, 1595 Wynkoop St., Denver, CO, 80202, USA

    Brian S. Caruso & Helen E. Dawson

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  1. Brian S. Caruso
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  2. Helen E. Dawson
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Correspondence to Brian S. Caruso.

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Caruso, B.S., Dawson, H.E. Impacts of groundwater metal loads from bedrock fractures on water quality of a mountain stream. Environ Monit Assess 153, 405–425 (2009). https://doi.org/10.1007/s10661-008-0367-6

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  • DOI: https://doi.org/10.1007/s10661-008-0367-6

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