Shaft measurements relative to OD  (from closure plans)

North shaft:  

• Surface:
• top deck running-on level            +520.58 ft  
• bottom deck running-on level     +514.16 ft
• Top Hard inset    (520 yd)
• bottom deck running-on level     -1045.38 ft
• roadway height                                      12 ft
• 2nd Waterloo       (564 yd)
• (depth 591 yd)

South shaft: 

• Surface:
• top deck running-on level            +514.11 ft  
• bottom deck running-on level     +507.79 ft
• Top Hard inset             (508 yd)
• roadway height                                      12 ft
• Dunsil inset                  (536 yd)
• Deep Hard inset           (763 yd)
• bottom deck running-on level     -1783.23 ft
• roadway height                                       18 ft
• Pump inset
• Low Main (bricked)     
• Blackshale (bricked)