2010-12-08_PERMIT FILE - C1981008A ‎(14)‎

• Permit No: C1981008A
• IBM Index Class Name: Permit File
• Doc Date: 12/8/2010
• Doc Name: Vegetation Information
• Section_Exhibit Name: Section 2.04.10 Vegetation Information NH2 Mine Area
• Media Type: D
• Archive: Yes

and New Horizon Mine II study area to the south. Soil is similar to study area soil map unit 98C
and the vegetation is similar to the sagebrush -1 (SG -1) in the study area.
Total vegetation cover (first hit) for the type averaged 36.0 percent, with bare ground at 32.5
percent, litter at 19.9 percent, and rock outcrop and rock fragments at 11.6 percent (Table
2.04.10 -27). Lichen and moss accounted for 4.6 percent of the mean cover. The shrub
component dominated with 14.4 percent cover followed by the perennial grass component at
11.9 percent cover. Annual grasses account for 4.1 and 2.6 percent cover. Succulents had
0.1 percent cover and trees had 0.9 percent cover. Consistent with the type designation,
sagebrush ( Artemisia tridentata had the highest perennial shrub species cover at 12.2 percent
(68 percent frequency), followed by broom snakeweed with cover at 1.9 percent (8 percent
frequency). The perennial grass blue grama had 7.4 percent cover (33 percent frequency) and
needlegrass with
Table 2.04.10 -27
Mean Cover (percent) And Frequency Values
For Sagebrush Reference Area,
New Horizon 2 Permit Expansion Study Area, 1999
SPECIES
Annual Grasses
Anisantha tectorum
Total Annual Grasses
Perennial Grasses
Bouteloua gracilis
Hilaria jamesii
Oryzopsis hymenoides
Sitanion longifolium
Stipa neomexicana
Total Perennial Grasses
Shrubs
Artemisia tridentata
Atriplex canescens
Gutierrezia sarothrae
Total Shrubs
MEAN PERCENT COVER (N =75)
4.1 22
4.1 --
7.4
33
0.5
03
0.1
01
0.9
06
2_9
9
I7.7
12.2 29
0.4 01
1.9 08
14A --
Revised September 2010 (PR 06) 2.04.10 -84