2011-07-15_PERMIT FILE - C1981019A

• Permit No: C1981019A
• IBM Index Class Name: Permit File
• Doc Date: 7/15/2011
• Section_Exhibit Name: 4.15 Revegetation Requirements
• Media Type: D
• Archive: Yes

Seed Mix - Buried Topsoil Test Plot Seed Mix - Colowyo Mine - 2006
Recommended
Seed-sr
Species
Synonym
Common Name
Seeds/ lb.
lbs. / acre
sq. foot
Agropyron dasystachyum
Elymus lanceolatus ssp. lanceolatus
Thickspike Wheatgrass
154,000
0.25
0.88
Agropyron smithy
Pascopyrum smithii
Western Wheatgrass
110,000
0.25
0.63
Agropyron spicatum inerme
Pseudoroegneria spicata ssp. inerme
Beardless Bluebunch Wheatgrass
117,000
0.50
1.34
Agropyron trachycaulum
Elymus trachycaulus ssp. trachycaulus
Slender Wheatgrass
159,000
0.50
1.83
Poa ampla
Big Bluegrass
882,000
0.10
2.02
Subtotal =
1.60
6.71
Achillea millifol /um
Western Yarrow
2,770,000
0.10
6.36
Artemisia ludoviciana
Louisiana Sagewort
33,600
0.75
0.58
u
o
ASterChilensis
virgulasterascendens
Pacific Aster
2,668,000
0.10
6.12
o
L/num lewis/i
Lewis Flax
293,000
0.20
1.35
t°
Artemisia frldgida
Fringed Sage
4,536,000
0.05
5.21
Penstemon str/ctus
Rocky Mountain Penstemon
592,000
0.20
2.72
Subtotal =
1.40
22.33
Amelanchieralnifolia
Saskatoon Serviceberry
25,800
1.50
0.89
Artemisa tridentata vaseyana
Mountain Big Sagebrush
2,500,000
0.25
14.35
Artemisia cana
Silver Sagebrush
850,000
0.75
14.63
Atrip /excanescens
Fourwing Saltbush
52,000
1.00
1.19
Ceratoides lanata
Wiinterfat
56,700
2.00
2.60
Chrysothamnusnauseosus
Rubber Rabbitbrush
400,000
0.50
4.59
CE
Purshla tridentata
Bitterbrush
15,000
3.00
1.03
Rosa woodsii
Wood's Rose
45,300
1.50
1.56
symphoncarpos rotundifoliius
Mountain Snowberry
75,000
1.50
2.58
Subtotal =
12.00
43.44
Total
15.00
72.48
At the peak of each subsequent growing season, or shortly thereafter, for a period of at
least 5 years, these test plots were to be evaluated for emergent shrub density, ground
cover by species, and a visual evaluation of surficial erosion. This data would be
reported annually in the Annual Reclamation Report. If data shows that there is promise
as a shrub conducive reclamation procedure, CDMG may be contacted to initiate
alternate reclamation procedures for the remainder of Colowyo reclamation.
[As of March, 2008, these test plots had not been constructed because of the impending
revision to the reclamation plan. Because of this revision and the reasonable promise of
success for the new proposed procedures, construction of these test plots has been placed
"on- hold" until as such time as they may become necessary.]
Aspen and Tall Shrub Establishment Areas
As a result of negotiations with CDOW and DRMS regarding approval of TR -72, and the
development of TR -84, Colowyo has committed to implementing three field trials. Based
upon initial estimates of disturbance to aspen and tall shrub habitats in the South Taylor
area, a determination was made that the establishment of 20 acres of aspen habitat and 20
acres of tall shrub habitat (combination of thin and thick topsoil locations) be established
in the South Taylor reclamation area (mining disturbance area). As a result of subsequent
changes to the mine plan, approximately (7% or 14 acres) of the aspen and (41% or 347
acres) of the tall shrub habitat previously targeted for disturbance will no longer be
affected. A reduced area of (18.5) acres of aspen and (12.0) acres of tall shrubs will now
be pursued at Colowyo. The field trials are meant to provide information to Colowyo,
DRMS and the CDOW about the appropriate expectations for success /failure of
establishing these habitat types at Colowyo in the context of a ten year bond clock and
also to provide some baseline information that can be used to modify practices and the
plant materials used to meet the current expectations (acres of each habitat type identified
4.15 -12 Revision Date: 6/21/11
Revision No.: TR -84