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| Title | Effects of Holden Mine on the Water, Sediments, and Benthic Invertebrates at Railroad Creek (Lake Chelan) | |||
| Month-Year Published | July 1997 | |||
| Online Availability |
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| Short Description |
Iron, zinc, copper, cadmium, lead, other metals, and cyanide were analyzed in drainage from the abandoned Holden mine, tailings pile leachate, and Railroad Creek water and sediment collected above and below the mine. Creek samples were subjected to toxicity tests with Ceriodaphnia dubia, Hyalella azteca, and Microtoxâ. The health of Railroad Creek′s benthic invertebrate community was quantitatively assessed. (Also see abstract below) | |||
| Publication Number | 97-330 | |||
| Author(s) | Johnson, A. | |||
| Print Availability | ||||
| Number of pages | 57 pp. + app (92 total) | |||
| Keywords | benthic, bioassay, biological, biological integrity, cadmium, chemical, copper, creek, cyanide, fee, invertebrates, lake, lead, metals, mining, railroad, results, sediment, stream, toxic, toxicity, water, water quality, zinc | |||
| Subject Waterbodies |
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| Abstract | Long Description |
Iron, zinc, copper, cadmium, lead, other metals, and cyanide were analyzed in drainage from the abandoned Holden mine, tailings pile leachate, and Railroad Creek water and sediment collected above and below the mine. Creek samples were subjected to toxicity tests with Ceriodaphnia dubia, Hyalella azteca, and Microtoxâ. The health of Railroad Creek′s benthic invertebrate community was quantitatively assessed. Chemical results are compared to historical data and analyzed in terms of elevation above background, metal loadings, aquatic life criteria, and findings from the bioassays. Benthic community data are summarized and statistically analyzed using organism density, taxa richness, Ephemoptera-Plecoptera-Trichoptera richness, and metals tolerance indices. The impact of metals on indicator taxa and functional feeding groups identified in the creek and the potential influence of insect drift from upstream areas are discussed. Results show the Holden site is having a devastating effect on the water quality and aquatic life of Railroad Creek. A biological integrity target is recommended to help measure the effectiveness of future pollution control efforts on Railroad Creek. |
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