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)
No soil is associated with this inclusion. Limited by steepness, and surface roughness that
includes loose rock and rock outcrop exposures.
SOIL PROPERTIES AND QUALITIES
Howardsville
Effective rooting depth: greater than 20 inches.
Drainage class: excessively.
Depth to seasonal high water table: greater than 6 feet.
Available water capacity: very low.
Permeability: rapid.
Runoff: medium.
Rock outcrop
Landform: cliffs and talus.
Parent material: residuum and colluvium.
Rock type: igneous and metamorphic.
Runoff: rapid.
VEGETATION
Potential natural communities:
Howardsville: subalpine fir-Engelmann spruce/Rocky Mountain whortleberry (Abla-
Pienl/Vamy) typical site, and lodgepole pine/Rocky Mountain whortleberry (Pico/Vamy) dry
site, and bristlecone pine/common juniper (Piar/Juco) dry, exposed site.
Seral stages: dominated by plants of the respective potential natural communities.
Present vegetation: dominated by plants of the respective potential natural communities.
USE AND MANAGEMENT CONSIDERATIONS
Major uses: wildlife habitat and watershed.
Mass movement potential:
Landslides: moderate.
Debris flows: high.
Snow avalanche: high.
Sediment delivery efficiency: high.
Road and trail limitations:
Cut and fill slope stability
Howardsville: severe-slope and sandy parent material.
Rock outcrop: slight- bedrock.
Improved unsurfaced roads:
Howardsville: severe-slope.
Rock outcrop: severe- cliffs and unstable talus.
Offroad vehicle roads and trails:
Howardsville: severe-slope and erosion hazard.
Rock outcrop: severe- cliffs and unstable talus.
Foot trails and paths:
Howardsville: moderate-slope.
Rock outcrop: severe- cliffs and unstable talus.
Revegetation limitations:
Howardsville: severe- low available water capacity, low inherent fertility, slope and erosion
hazard.
Rock outcrop: severe- bedrock.
Revegetation considerations: Plant drought tolerant plants to survive south facing slopes.
Mulch will conserve soil moisture and protect seedling establishment. Surface netting will
reduce the erosion hazard.
Timber management considerations: Limited by slope, rock outcrop, and erosion hazard.
South facing slopes have a high seedling mortality and trees are slow to establish.
Exhibit I —Appendix A I-A-18 March 2024