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Table 3

Sediment and color classification statistics for HMS and pre-mining sediment. DOI: https://doi.org/10.1525/elementa.333.t3

Hydraulic Mining Sediment

 
Shepard sediment classification Count Percent 

 
Sand 31 55% 
Gravelly Sediment 13% 
Sandy Silt 13% 
Silt 9% 
Silty Sand 9% 
Clayey Silt 2% 
Munsell Color classification CountPercent

 
Pale Brown or Very Pale Brown 31 55% 
Light Yellowish Brown, Light Brownish Gray, or Light Gray 20 36% 
Brown or Yellowish Brown 9% 
Pre-mining Sediment 

 
Shepard sediment classification Count Percent 

 
Sandy Silt 27% 
Silt 19% 
Silty Sand 15% 
Sand 15% 
Sand Silt Clay 12% 
Gravel 12% 
Munsell color classification Count Percent 

 
Brown, Yellowish Brown, or Grayish Brown 15 58% 
Dark Grayish Brown or Dark Yellowish Brown 15% 
Pale Brown 15% 
Light Gray 12% 
Hydraulic Mining Sediment

 
Shepard sediment classification Count Percent 

 
Sand 31 55% 
Gravelly Sediment 13% 
Sandy Silt 13% 
Silt 9% 
Silty Sand 9% 
Clayey Silt 2% 
Munsell Color classification CountPercent

 
Pale Brown or Very Pale Brown 31 55% 
Light Yellowish Brown, Light Brownish Gray, or Light Gray 20 36% 
Brown or Yellowish Brown 9% 
Pre-mining Sediment 

 
Shepard sediment classification Count Percent 

 
Sandy Silt 27% 
Silt 19% 
Silty Sand 15% 
Sand 15% 
Sand Silt Clay 12% 
Gravel 12% 
Munsell color classification Count Percent 

 
Brown, Yellowish Brown, or Grayish Brown 15 58% 
Dark Grayish Brown or Dark Yellowish Brown 15% 
Pale Brown 15% 
Light Gray 12% 
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