Once the top of the shift is lined with steel casing, a winch will be put in place Engineers have begun reinforcing the top of a mine shaft in preparation for the evacuation of 33 miners trapped underground for 66 days.
On Saturday, they succeeded in drilling through to a workshop chamber, from which the men can be rescued.Sixteen metal tubes are being welded together to reinforce fragmented rock in the first 100m (330ft) of the shaft.
Chile's mining minister says the operation to bring the miners to the surface should then begin on Wednesday.
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