2009-08-13_PERMIT FILE - C1981019A ‎(4)‎

• Permit No: C1981019A
• IBM Index Class Name: Permit File
• Doc Date: 8/13/2009
• Section_Exhibit Name: Rule 2 Permits -ST
• Media Type: D
• Archive: Yes

RULE 2 PERMITS
No Special Handling Procedures will be required for the overburden in the South Taylor pit. The current
overburden sampling program that will be used for the East Pit, West Pit, Section 16 Pit and the South
Taylor Pit is described within Volume 1, Section 2.05. The reclaimed overburden suitability criteria is
further discussed in Section 2.04.6 of Volume 12. It was discussed between the Division of Reclamation,
Mining and Safety (DBMS) and Colowyo that suspect levels of the Sodium Adsorption Ratio (SAR),
Selenium (Se), Boron (B), Saturation % (Sat), and Molybdenum (Mo) need to be addressed in more detail
to determine that Special Handling Procedures, that are outside the normal pit operational procedures, will
not be needed in the South Taylor pit area. For this purpose, Colowyo will only use the material that is
removed and stockpiled by the Truck Shovel operation to cap the regraded areas. It was also noted
through review of Exhibit 6, Item 6, that in the region of the initial boxcut area, no unsuitable material
was found in the seam sequence from the F6 coal seam to the G8 coal seam that will be removed by the
Truck/Shovel operation. The entire seam sequence from the top overburden through to the bottom G8
seam, which resides in the area of the initial boxcut, will be placed in the valley fl] locations; this will
allow Colowyo enough spoil room to reach the desired mining depth.
In the following analysis, Colowyo has demonstrated that no Truck Shovel spoil material will exceed the
suitability range for overburden criteria as described in Volume 1, section 2.05. This demonstration will
be completed by showing the total percentage of unsuitable material in comparison to the total amount of
suitable material in the truck/shovel sequence as it relates to the drill hole data shown in Exhibit 6, Item 6.
It was discussed with DBMS, that as long as the total percentage does not exceed 15% of the total truck
shovel sequence for each drill hole, spoil suitability will not be an issue based upon the overburden
seams.
Drill Hole 83-D3-06
• Unsuitability range in feet of Truck Shovel Sequence:
SAR > 15 = N/A
Se>0.3=6.7feet
B>5.0=N/A
Sat <25 or>80 = 28.5 feet
Mo > 1.0 = 7,8 feet
Total Depth from surface to Bottom of Truck Shovel Sequence (F6) =184.7 feet
Total Percentage of each criteria for Truck Shovel Sequence:
SAR = N/A
Se = 6.7 feeU184.7 feet = 3%
B = N/A
Sat = 28.5 feeU184.7 feet = 15%
Mo = 7.8 feeU184.7 feet = 4%
Suitability analysis for Drill Hole 83-D3-06 shows all criteria within the suitable range.

South Taylor/Lower Wils°n -Rule 2, Page 92 RaVlslon Date: 4/16/07
Revision No.: PR-02