2011-10-05_APPLICATION CORRESPONDENCE - C2010089

• Permit No: C2010089
• IBM Index Class Name: APPLICATION CORRESPONDENCE
• Doc Date: 10/5/2011
• Doc Name: Letter regarding Threatened & Endangered Species
• From: DRMS
• To: OSM
• Email Name: SB1
• Email Name: MLT
• Media Type: D
• Archive: No

NHN Mine Depletion Summary to San Miguel River
Column 1 - Dust Suppression use that occurred in the maximum year of 2005
Column 2 - Average Dust Suppression use for the period 1998 to 2008
Column 3 - Evaporation from NHN Ponds 1 -3
Column 4 - Mine facility well(s) use at NHN.
Column 5 - sum of (1), (3) and (4)
Column 6 - sum of (2), (3) and (4)
These depletions will occur to Tuttle Draw and Coal Canyon, both tributaries of the San Miguel
River. The average depletions should be 42.33 acre -feet per year with maximum amount in the
range of 51.26 acre -feet per year.
This is the best estimate obtainable for the future consumptive uses at the NHN Mine.
/s/ - Wayne 1. Schieldt
Wayne I. Schieldt, P.E.
Manager, Water Resource Solutions, LLC
Max year
2005 dust
suppression
Average dust
suppression
for 1998-
2008
Pond
evaporation
for NHN
Lagged
NHN
domestic
wells
Total
with
Max
year
Total
with
averages
Unit
af
af
af
af
af
af
Column
1
2
3
4
5
6
January
0.73
0.86
0.00
0.02
0.75
0.88
February
1.27
1.03
0.00
0.01'
1.28
1.04
March
3.84
2.67
0.20
0.01
4.05
2.88
April
6.08
3.65
0.37
0.01
6.46
4.03
May
6.41
5.12
0.51
0.01
6.93
5.64
June
7.71
6.32
0.65
0.02
8.38
6.99
July
7.15
5.50
0.62
0.02
7.80
6.14
August
5.08
4.68
0.55
0.03
5.66
5.26
September
3.04
2.85
0.39
0.03
3.46
3.28
October
2.31
3.24
0.25
0.02
2.57 '
3.51
November
3.04
1.84
0.12
0.02
3.18
1.98
December
0.72
0.68
0.00
0.02
0.74
0.70
total
47.37
38.44
3.67
0.22
51.26
42.33
NHN Mine Depletion Summary to San Miguel River
Column 1 - Dust Suppression use that occurred in the maximum year of 2005
Column 2 - Average Dust Suppression use for the period 1998 to 2008
Column 3 - Evaporation from NHN Ponds 1 -3
Column 4 - Mine facility well(s) use at NHN.
Column 5 - sum of (1), (3) and (4)
Column 6 - sum of (2), (3) and (4)
These depletions will occur to Tuttle Draw and Coal Canyon, both tributaries of the San Miguel
River. The average depletions should be 42.33 acre -feet per year with maximum amount in the
range of 51.26 acre -feet per year.
This is the best estimate obtainable for the future consumptive uses at the NHN Mine.
/s/ - Wayne 1. Schieldt
Wayne I. Schieldt, P.E.
Manager, Water Resource Solutions, LLC