In gallery and large-tunnel construction with appropriate rock overburden the projected time for heading and development work is substantially reduced by access tunnelling via one or more shafts. Here the shaft hoisting system undertakes the removal of the excavated material and the supply of material and personnel to the large underground construction site.
For decades shaft hoisting in mining has been carried out in just the same way as the lifting of ships, namely by using the counter-weight principle.
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