2024-05-17_REVISION - M1977493 ‎(3)‎

• Permit No: M1977493
• IBM Index Class Name: Revision
• Doc Date: 5/17/2024
• Doc Name: Exhibit I - Soil Information
• From: Climax
• To: DRMS
• Type & Sequence: TR37
• Email Name: TJ1
• Media Type: D
• Archive: No

Permit M-1977-493—Climax Mine Technical Revision 37 (TR-37)
C -- 10 to 24 inches; yellowish brown (10YR 5/4) extremely gravelly loamy coarse sand; massive;
soft, loose, non-sticky, non-plastic; few fine roots; few fine tubular pores; 60 percent gravel, 5
percent cobble; medium acid (pH 5.6); gradual wavy boundary.
Cr--24 to 60 inches;highly weathered gneiss and granitic bedrock.
Soil depth to weathered bedrock is 23 to 33 inches. The reaction of the soil is very strongly to
medium acid.
The A or AE horizon has hue of 10YR or 7.5YR, value of 4 to 6 dry, and 3 to 5 moist, and chroma
of 2 to 4. The texture of the fine earth fraction is sandy loam or sandy clay loam. The soil has 25
to 45 percent rock fragments.
The Bw horizon has hue of 7.5YR or 10YR, value of 4 to 6 dry, and 4 or 5 moist, and chroma of 2
to 4. The texture of the fine earth fraction is sandy loam or loamy sand. The soil has 45 to 65
percent rock fragments.
The C horizon, where present, has hue of 10YR or 7.5YR, value of 5 or 6 dry, and 4 or 5 moist,
and chroma of 4 to 6. The texture of the fine earth fraction is loamy coarse sand or coarse sandy
loam. The soil has 50 to 65 percent rock fragments.
Borohemists
Depth Class: Deep
Drainage class: Poorly drained
Permeability: Moderate
Landform: Intermontane valleys and mountains
Position on the Landform: Flood plains, terraces, basins, and depressions
Parent material: Decomposing organic material over alluvium and colluvium weathered from
mixed rock sources
Slope range: Nearly level to 10 percent
Effective rooting depth: Greater than 40 inches.
Natural drainage class: Very poorly.
Depth to seasonal high water table: 0 to 1 feet.
Available water capacity: Low.
Permeability: Rapid.
Runoff.- Slow.
Taxonomic class: Loamy-skeletal, mixed Eutic Terric Borhemists.
Reference Pedon:
A representative pedon of this soil occurs in map unit 100A supporting water sedge/beaked
sedge, water sedge/elephant-head and Baltic rush/sedges community type on a 2 percent south
facing concave slope at 10,416 feet elevation located in the NW 1/4, NW 1/4, sec. 15, T. 10 S., R.
84 W., in Pitkin County, Colorado:
Oil -- 11.5 to 0 inches; unmatted sedge leaves and undecomposed moss litter.
Oi2 -- 0 to 4 inches; dark reddish brown (5YR 3/2) and dark reddish brown (5YR 3/2) rubbed
moist; extremely acid (pH 4.1); clear smooth boundary.
Exhibit I —Appendix A I-A-57 March 2024