2013-09-24_REVISION - C1981014

• Permit No: C1981014
• IBM Index Class Name: REVISION
• Doc Date: 9/24/2013
• Doc Name: Response to Preliminary Adequacy Concerns
• From: Energy Fuels Coal Inc
• To: DRMS
• Type & Sequence: TR40
• Email Name: JHB
• Email Name: DIH
• Media Type: D
• Archive: No

Table 1
Energy Fuels Coal, Inc.
Southfield Mine
MW -NW Mine Refilling Investigation
Area and Volume Calculation Summary
Total Scaled Area:
547.9
square inches
Total Non - Pillared Area:
253.8
square inches
Total Pillared Area:
294.1
square inches
Total Weighted Scaled Area: 952.4 square inches
Estimated Total Mine volume: 5700.0 acre -feet
Notes:
Scaled areas based on the Southfield Mine Permanent Closure Map dated August 2001.
Weighted areas include weighting to account for pillared areas.
Non - Pillared Areas: 40% Mined
Pillared Areas: 95% Mined
Weighting Ratio 2.375
sq. inch = square inch
of = acre-feet
Elevations based on information included in the Southfield Mine Permanent Closure Map dated August 2001.
Estimated total mine area based on page 2.05.06 -32 of the mine plan document.
Conceptual Model No. 1
Conceptual Model No. 2
Conceptual Model No. 2
Conceptual Model No. 3
entire mine area fills
1 North, 1 1/2 North and
1 North, 1 1/2 North and
North mine area fills
as a single unit
2 North fills as a single unit
2 North fills as a single unit
as a single unit
Elevation (feet):
5860.5
5860.5
5879.7
5860.5
Non - Pillared Area Below Elevation (sq. inch):
118.6
0
2.17
2.64
Pillared area Below Elevation (sq. inch):
170.6
8.51
10.31
104.02
Total Weighted Area Below Elevation (sq. inch):
523.8
20.2
26.7
249.7
Percent Weighted Scaled Area Below Elevation:
55.0%
2.1%
2.8%
26.2%
Estimated Mine volume Below Elevation (af):
3135
121
160
1494
Notes:
Scaled areas based on the Southfield Mine Permanent Closure Map dated August 2001.
Weighted areas include weighting to account for pillared areas.
Non - Pillared Areas: 40% Mined
Pillared Areas: 95% Mined
Weighting Ratio 2.375
sq. inch = square inch
of = acre-feet
Elevations based on information included in the Southfield Mine Permanent Closure Map dated August 2001.
Estimated total mine area based on page 2.05.06 -32 of the mine plan document.