2012-10-01_REVISION - M1977306 ‎(22)‎

• Permit No: M1977306
• IBM Index Class Name: REVISION
• Doc Date: 10/1/2012
• Doc Name: EPP- Submittal, Ecological Site Description to Pg. U-29.
• From: Cotter
• To: DRMS
• Type & Sequence: AM1
• Media Type: D
• Archive: No

6. Radioactive testing of the pond area will determine the actual amount of material that will need to be
removed from the subgrade Cotter's experience at other sites with identical liners indicates that 70
cubic yards will need to be removed. For the purposes of the worst case scenario, 100 cubic yards are
assumed. This material will be excavated via track hoe and hauled down to the lower mine area in
trucks to be disposed of in the mine portal. Estimated time for a track hoe, loader and dozer are 6 hours
each. Small equipment can be used; therefore, the combined hourly cost is $260 /hr. Therefore, the cost
of this task is $260 x 6 = $1,560.
7. Scrape the top 18 inches of material on the ore pad at the lower mine area and place this material in the
portal by pushing with a small dozer The estimated area of ore -pad dirt is approximately 50 feet x 50
feet. An area of 60 feet x 60 feet will be used in the worst case scenario calculation. Therefore, the
volume to be removed is 3600 sq. ft. x 18 inches = 200 cubic yards. The cost is $1.20 per cubic yard.
The existing roof fall in the mine is approximately 100 feet in the portal. Using the dimensions of 12 ft
wide x 9 ft high in the decline, this results in a storage volume of 400 cubic yards. Therefore, there is
more than enough capacity to contain the 200 cy from the ore pad and the 100 cy from the upper mine
area ponds. Also, there is enough volume to provide for 90 cy of fill for the MSHA seal. The cost of
this task is $1.20 per cubic yard x 200 cy = $240.
8. Seal the Lower Mine Area portal with 50 feet of fill pushed into the portal using a bulldozer The
majority of the mine seal will be mine waste removed from the waste area embankment. The outer 12
inches of the seal will be inert material (3.6 cubic yards of inert material). This equates to a waste
volume of 86.7 cubic yards. The inert material will have to be imported. The cost of import and
placement is $11.00 per cy. Therefore the cost of import is $11.00 /cy x 3.6 cy = $39.60. The waste
material will be pulled from the waste excavated from the drainage, the cost of which is covered in item
9. Re- contour the two existing old ponds and the two new ponds at the Upper Mine Area This cut and fill
balance is:
L -3
New Ponds
Old Ponds
Total
Cut (CY)
1,297
2,492
3,789
Fill (CY)
578
156
734
Net (CY) J
719( 2,3361 3,055
6. Radioactive testing of the pond area will determine the actual amount of material that will need to be
removed from the subgrade Cotter's experience at other sites with identical liners indicates that 70
cubic yards will need to be removed. For the purposes of the worst case scenario, 100 cubic yards are
assumed. This material will be excavated via track hoe and hauled down to the lower mine area in
trucks to be disposed of in the mine portal. Estimated time for a track hoe, loader and dozer are 6 hours
each. Small equipment can be used; therefore, the combined hourly cost is $260 /hr. Therefore, the cost
of this task is $260 x 6 = $1,560.
7. Scrape the top 18 inches of material on the ore pad at the lower mine area and place this material in the
portal by pushing with a small dozer The estimated area of ore -pad dirt is approximately 50 feet x 50
feet. An area of 60 feet x 60 feet will be used in the worst case scenario calculation. Therefore, the
volume to be removed is 3600 sq. ft. x 18 inches = 200 cubic yards. The cost is $1.20 per cubic yard.
The existing roof fall in the mine is approximately 100 feet in the portal. Using the dimensions of 12 ft
wide x 9 ft high in the decline, this results in a storage volume of 400 cubic yards. Therefore, there is
more than enough capacity to contain the 200 cy from the ore pad and the 100 cy from the upper mine
area ponds. Also, there is enough volume to provide for 90 cy of fill for the MSHA seal. The cost of
this task is $1.20 per cubic yard x 200 cy = $240.
8. Seal the Lower Mine Area portal with 50 feet of fill pushed into the portal using a bulldozer The
majority of the mine seal will be mine waste removed from the waste area embankment. The outer 12
inches of the seal will be inert material (3.6 cubic yards of inert material). This equates to a waste
volume of 86.7 cubic yards. The inert material will have to be imported. The cost of import and
placement is $11.00 per cy. Therefore the cost of import is $11.00 /cy x 3.6 cy = $39.60. The waste
material will be pulled from the waste excavated from the drainage, the cost of which is covered in item
9. Re- contour the two existing old ponds and the two new ponds at the Upper Mine Area This cut and fill
balance is:
L -3