REP06340

• Permit No: C1981033
• IBM Index Class Name: Report
• Doc Date: 4/22/1982
• Doc Name: 1982 STABILITY ANALYSIS OF PORTAL & ACCESS ROAD AREAS
• From: ROCKY MOUNTAIN GEOTECHNICAL
• Permit Index Doc Type: SUBSIDENCE REPORT
• Media Type: D
• Archive: No

SLOP L• STABILITY SL;•L~L4RY SHGCT
BEAR MINE N0. 3
Conditions Analyzed:
Colluvium - c = 210 psf, 0 = 16° (Residual strength)
Bedrock (other than massive sandstone) - c = 4000 psf, 0 = 33° (typical overall triaxial
shear strength performance for interbedded siltstone, sandstone, and shale)
Seepage condition - no subsurface seepage.
Pfarginally Minimum Critical Pfode
Slope Stable Stable Unstable F.S. Circular Plane

Section A:
Existing condition:
Above portal area X 0.620 X
Below bench area X 0.548 X
Future condition:
20 ft. bench - above portal X 0.553 X
40 ft. bench - above portal X 0.579 X
40 ft. bench - below bench X 0.612 X
Section B:
Existing condition:
Above portal area X 1.453 X
Below bench area X 0.812 X
Future condition:
Above portal area X 2.138 X
Below bench area (reclaimed) X 0.804 X
Section C:
Existing condition:
Above portal area X 0.803 X
Below bench area X 0.876 X
Future condition:
Above portal area X 0.811 X
Below bench area (reclaimed) X 0.838 X
Section D:
Existing condition:
Above portal area X 0.819 X
Below bench area X 0.809 X
Future condition:
Above portal area X 0.846 X
Below bench area (reclaimed) X 0.801 X
Section E:
Existing condition:
Above haul road X 0.835 X
Below haul road X 0.829 X
Future condition:
Above haul road X 0.797 X
Below haul road X 0.791 X