REP27867

• Permit No: M1977378
• IBM Index Class Name: Report
• Doc Date: 4/28/1976
• Doc Name: GEOTECHNICAL INVESTIGATION TAILINGS POND 3 STANDARD METALS SILVERTON MILL
• Media Type: D
• Archive: No

' generally included the same soil type materials encountered in holes 1
' and 2,(i.e. silty, clayey gravels with cobbles and boulders). No bedrock
was encountered in any of the test holes to elevation 9374.5 feet, the
maximum depth of exploration.
' free water was encountered in 6 of the holes at depths of 14 to 46
feet, {ele vations 9425 to 9386 feet). Generally, the free water wens encountered
' in ei ther the natural in place deposits, or in the slime tailings, Where
only sand tailings were encountered in the test holes, no water was present
' or it was at
or below the ori
inal
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' cased with 1.5 inch perforated PVC pipe for subsequent ground water monitoring.
Test holes 8, 9 and 9A encountered what is believed to be an historic
tailings pond below elevation 9430 feet. In these test holes most of the
tailings encountered below this elevation were slimes. It is evident that
historic tailings also compose the base of the road along the south side
' of the embankment.
' LABORATORI' INVESTIGATION AND TESTING
As the samples arrived in the laboratory, the field descriptions were
' carefully reviewed and the soils classified into similar units of engineering
properties. During this examination, emphasis was given to the engineering
properties involved in the soils encountered. Samples designated for testing
' were then correlated between holes for similar types of material and properties.
Where samples were not suitable for testing, or where samples were not
obtained, strength values were assumed or correlated with the field t~>sts
for the analysis. Following the correlation of samples of similar tyres
' of material, the laboratory testing program was initiated and included the
' following types of tests:
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