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Mercury Data for Water and Sediment from the Dutch Flat Mining District, California

PRELIMINARY DATA--SUBJECT TO REVISION

Results of mercury analysis for bed sediment samples from the Dutch Flat mining district, California

[conc., concentration; ng, nanogram; g, gram; s.d., standard deviation, CV-AVS, cold vapor atomic fluorescence spectroscopy; nd, not determined]

  BED SEDIMENT   BED SEDIMENT    
  wet weight   dry weight    
Sample Sample Date Mercury Percent Solids Mercury Laboratory1 Method
Location Description   conc. s.d.   conc. s.d.    
(see map)     ng/g ng/g   ng/g ng/g    
 
POLAR STAR TUNNEL
PS1 fine silt to fine sand 10-Aug-98 1,800 nd 75% 2,400 nd A CV-AFS
PS2 fine gray to black silt 10-Aug-98 15,000 nd 71% 21,000 nd A CV-AFS
PS3 top gravels (with fines) 10-Aug-98 600,000 nd nd nd nd USGS - field panning
PS3 top gravels (with fines) 10-Aug-98 900,000 nd nd nd nd USGS - field panning
PS3 top gravels (with fines) 10-Aug-98 1,000,000 nd nd nd nd USGS - field panning
PS3 bottom gravels (with fines) 10-Aug-98 16,000,000 nd nd nd nd USGS - field panning
PS3 bottom gravels (with fines) 10-Aug-98 18,000,000 nd nd nd nd USGS - field panning
PS3 bottom gravels (with fines) 10-Aug-98 26,000,000 nd nd nd nd USGS - field panning
PS3 near sideboard 27-May-99 6,940 80 nd nd nd B CV-AFS
PS3 near iron seep 27-May-99 11,900 100 nd nd nd B CV-AFS
PS3 top 4 cm, sand and gravel 12-Nov-99 3,120 650 69% 4,520 950 C CV-AFS
PS3 top 4 cm, sand and gravel 12-Nov-99 3,150 132 64% 4,930 2,070 C CV-AFS
 
SOUTHERN CROSS TUNNEL
SC1 white precipitate, fine sand-silt 10-Aug-98 4,270 nd 64% 6,710 nd A CV-AFS
SC2 white precipitate, fine sand-silt 27-May-99 6,340 70 nd nd nd B CV-AFS
 
1 Laboratories:
A. Frontier Geosciences, Seattle, WA
B. U.S. Geological Survey, Boulder, CO
C. U.S. Geological Survey, Menlo Park, CA

Dutch Flat Mercury Data
California Water Resources
Contact Charlie Alpers, cnalpers@usgs.gov, (916) 278-3134
Last Modified: Wed Jan 19, 2000

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