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Baseline Deposition Rates, Lead-Rich Sediment, Coeur d’Alene (CdA) River Floodplain, Idaho Arthur Bookstrom, Stephen Box, Robert Fousek Mill tailings and.

Published byEmory Mills Modified over 9 years ago

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Presentation on theme: "Baseline Deposition Rates, Lead-Rich Sediment, Coeur d’Alene (CdA) River Floodplain, Idaho Arthur Bookstrom, Stephen Box, Robert Fousek Mill tailings and."— Presentation transcript:

1 Baseline Deposition Rates, Lead-Rich Sediment, Coeur d’Alene (CdA) River Floodplain, Idaho Arthur Bookstrom, Stephen Box, Robert Fousek Mill tailings and floods in the CdA drainage basin, Lead-rich sediments on the CdA River floodplain, Baseline rates of sediment deposition, Baseline concentrations of lead (Pb) in sediments, Secondary sources of Pb-rich sediment, Continuing deposition of Pb-rich sediments.

2 Location map

3 Production and Tailings Management

4 History of Flooding

5 Block Diagram of Floodplain

6 Star Mill - south fork Coeur d’ Alene River

7 Rose Lake, Idaho 1933 Flood Smelterville Flats, Idaho

8 Lead in Surficial Sediments

9 Riverbank near Medimont in 1993 1980 Mt. St. Helens volcanic ash layer Base of section of Pb-rich sediments Section of Pb-Rich Sediments

10 Lead-Concentration Profiles

11 Pre- and Post-1969 Rates of Sediment Deposition in Medicine Lake

12 Summary of Baseline Depositional Rates and Lead Concentrations

13 Baseline Depositional Rates 1.83.07.4

14 Lateral Variation in Baseline Rates of Sediment Deposition 28.5

15 Baseline Lead Concentrations 150028004500

16 Lateral Variation in Baseline Lead Concentrations 7500

17 Box plots of historic and baseline sediment-deposition rates

18 Box plots of Pb concentrations in sediments of successive time intervals Figure 23. Box-and-whisker plots, comparing interval-weighted average lead (ppm Pb) in sediments of the early post-tailings-release (BA1) and baseline (AA) time-stratigraphic intervals. n = 13 90th percentile 75th 50th 25th 10th 4000 3300

19 Percentages of tailings-derived Pb in sediments by drainage basin, and by depositional setting

20 Lead Concentrations in Suspended Sediment

21 1996 Scour of Pb-Rich Sediments in the River near Dudley Approximate location of drill hole 94VCD2 Log exposed by flood scour Stored Pb-rich sediments (well stratified) River bottom before 1996 flood Scoured zone Sandy active bed sediment (poorly stratified)

22 Secondary Sources of Pb-Rich Sediment in the River Channel ’96 scour

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