Primary local stability risk factors:
Cut sequence: Is an outside lift sequence being used?
Final stump: Is an adequate final stump consistently being left in place?
Support: Are mobile roof supports being used?
Roof bolts: Is extra roof support used in intersections?
Global stability risk factors:
Pillar design: Is the ARMPS SF adequate to prevent a squeeze?
Collapse prevention: If the ARMPS SF less than 2.0 and the pillar w/h less than 4.0, either on advance or in the worked-out area, have steps been taken to prevent a massive pillar collapse?
Barrier pillar design: If the depth of cover is greater than 1000 ft, are stable barrier pillars (SF greater than 1.5 to 2.5) being used to separate the panels?
Other risk factors:
Roof geology: Is the roof at least moderate in strength?
Intersection span: Have entry widths and turnouts been minimized?
Multiple seam interactions: None anticipated?
Depth of cover: Less than 650ft?
Block size: Are the blocks uniform in size?
Age of workings: Is the development less than 1 year old?
Continuous haulage: None?