CVRD Inco now proposes to dewater the existing shaft, replace the current headframe with a new 135ft unit, and install a new production service hoist, being built by DavyMarkham, then deepen the shaft. The hoisting plant will have the capacity to haul around 2,200 tonnes of ore and 400 tonnes of rock waste daily, from the 4,110ft level; although to cover the future possibility of removing deposits below that depth, it will be designed to accommodate hoisting from 6,110ft, or almost 1¼ miles below ground.

There may be deeper shafts as well. I think Noront would require larger drilling equipment to test these levels.