_PERMIT FILE - M1974070 ‎(76)‎

• Permit No: M1974070
• IBM Index Class Name: Permit File
• Section_Exhibit Name: EXHIBIT I-SOILS
• Media Type: D
• Archive: No

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SOILS
' General
The proposed area lies in the valley of Boulder Creek immediately
' north of the Idaho Creek fork. The valley bottom land slopes
gently to the northeast. It is characterized by such floodplain
` features as ox bow lakes , meander scars and stream terraces.
These are typical of streams east of the Front Range.
r
Soil Types , Thicknesses , Distribution, Suitability for Mining
The mining area lies on the valley floor. Topsoil is 10 to 40
inches deep and has a shallow water table . Soil types are Nunn
loam, Bankard sandy loam, and Aquolls and Aquepts , both flooded
and gravelly substratum, soils typically formed in recent
alluvium. These soils are suitable for rangeland and wildlife.
They are typically underlain by sand and gravel deposits. The
attached exhibit describes each soil type in more detail
' (Figure 4) .
' The underlying sand and gravel deposits at tnis site range from
6 to 13 feet deep. Overburden ranges from 1 to 5 feet in thick-
ness . Gravels have been created in recent alluvium. They consist
of mountain rock, broken off or weathered, carried and reworked
by Boulder Creek. There are no large boulders due to the dis-
tance from the mountains and lack of stream energy to transport
them. All gravel in 5 samples taken passed the 3 inch sieve.
' (See sieve analysis, Figure 5) . Cobbles tend to be well rounded
1 I-1