REP03152

• Permit No: C1981019
• IBM Index Class Name: Report
• Doc Date: 2/22/1996
• Doc Name: AUGER MINING ANALYSIS WEST PIT AND STREETER PIT AND STABILITY EVALUATION NORTH WALL OF WEST PIT COLO
• Permit Index Doc Type: STABILITY REPORT
• Media Type: D
• Archive: No

TABLE A - I
SUMMARY OF AUGER SPACINGS AND EXTRACTION RATIOS

Seam Analysis General Conditions Primary Auger Data
Location Area Seam Auger Bedrock Spoil Auger Dia. W W(D Extraction
ft De th ft max ft max ft ft in
X-Seam West Pit
North Wall 1,2 10 500 170 170 7 72 0.86 29.6
East Wall 3 10 500 250 0 7 64 0.76 31.2
3A 10 500 350 0 7 96 1.14 25.7
38 10 500 350 0 7 96 1.14 25.7
Streeter Pit
North Wall 4 10 500 200 0 7 54 0.64 33.5
West Wall 5 10 500 250 0 7 80 0.95 28.2
C-Seam West Pit
North Wall 7 6 500 175 170 5 52 0.87 35.1
West WaN 6 6 500 355 0 5 65 1.08 31.4
East Wall 8 6 500 415 0 5 148 2.24 18.9
D-Seam West Pit
North Wall 7 10.3 500 195 170 7 82 0.98 27.0
West Wall 6 10.3 500 380 0 7 106 1.26 23.6
East Wall 8 10.3 500 435 0 7 254 3.02 13.3
E-Seam West Pit
North Wall 7 6.1 500 240 170 5 76 1.27 28.4
West Wall 6 6.1 500 425 0 5 99 1.65 24.3
East Wall B 6.1 500 480 0 5 312 51.9 10.4
Note: 460 feet excee ds maximum depth, refer to r eport.
NOTES:
1. Analysis Location, refer to Figs. A-1 and A-2.
2. W -minimum web width (in.). Minimum 42 in. for 6 ft. dia.; 48 in. for 7 ft, dia.; and W/D > i.0 for rectangular.
's. w(u moicates approximate wiotn to neignt ration of wen. nnmimum ut u.5i for circuaar and t.o for rectangwar.
4. Circular extraction ratios were calculated based upon full seam thickness and exact auger diameter.
5. Refer to Tables A-II throuch A-V for more details.