| 11. | Still, the lateral ridge of the slender main shaft is straight and fairly thin.
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| 12. | The secondary exit is used in the event that the main shaft elevator fails.
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| 13. | The Shinkolobwe mine has been officially closed for decades, and its main shaft sealed.
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| 14. | The explosion travelled up the main shaft, and blew the cage into the Bramham.
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| 15. | A crane is used to erect the main shaft.
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| 16. | Construction of the main shafts began in October 1872, with sinking commencing in February 1873.
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| 17. | A giant elevator sped down the main shaft, which splits off into several horizontal branches.
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| 18. | Cooling off a unit after use required precautions to prevent buckling of the main shaft.
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| 19. | Their main shafts included ZC, NBHC and Southern Cross.
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| 20. | By 1919 the main shaft was down to 148m.
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