REP28368

• Permit No: M1977300
• IBM Index Class Name: Report
• Doc Date: 2/1/1983
• Doc Name: SCHWARTZWALDER MINE WASTE ROCK PILE STABILITY
• Media Type: D
• Archive: No

• size material. The material is generally subangular to well-rounded.
Boulders up to 3 feet in diameter can be observed in this material.
Colluvial soils cover both sides of the valley. They are
generally dark brown and consist of angular gravels with some sand and
silt and occasional low plasticity clays. Sparse vegetation covers
most of the slopes. It is evident that the thickness of the Colluvial
soil cover varies at different locations. Although no accurate estimate
of soil thickness could be made without drilling or the exc~rvation of
test pits, an attempt was made to differentiate areas of Colluvial
soils with various thickness. The estimates were made with the help
of available cuts that had been made on the slopes, from observation
of vegetation, frequency of bedrock outcrops and by other means. The
accuracy of such estimation is limited and it would be necessary to
verify these estimates if more accurate information on the soil depth is
needed.
• One area of relatively deep Colluvial soils was identified on
the east side of the creek at the southern end of the sl:udy area,
approximately across the valley from the mine and the ore sorting
facilities. It was estimated that the depth of soils within this area may
be on the order of 10 feet or more. It is probable that the thickness of
Colluvial soil was increased by deposition of significant timounts of
outwash from the slopes above this area. This area could probably
be used for a borrow pit if soils are needed for reclamation or
other purposes.
The remaining part of the study area was divided im:o several
units where the thickness of the Colluvial soil was estimated to be
between 0 - 3 feet, and 0 - 1 foot. Again, these estimates are approxi-
mate only. The character of the Colluvial soils is not significantly dif-
ferent from those described above.
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