Engineering & Mining Journal

APR 2019

Engineering and Mining Journal - Whether the market is copper, gold, nickel, iron ore, lead/zinc, PGM, diamonds or other commodities, E&MJ takes the lead in projecting trends, following development and reporting on the most efficient operating pr

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Page 44 of 83

SHAFT SINKING APRIL 2019 • E&MJ 43 port. Each branch is operated by its own single-drum hoisting machine with 2.6- MW and 1.8-MW drive power, respectively. The removal side, which is solely intended for the removal of the mined material, is separated from the service side, which is used for the transport of passengers, con- crete and materials. After six partial cuts of 200 mm each (i.e., 1.2-m depths), the machine will be moved by the amount cut, personnel must occupy key positions and extend all supply lines in advance. Work decks Nos. 2 and 6 are equipped with sta- bilizers that serve to brace and center the SBR and prevent oscillating movements. These are retracted before the reposition- ing process. The SBR is then left hang- ing, re-centered, and aligned, using four 50-metric-ton (mt) stage winches. Schedule and Key Milestones Work began on the construction site in 2017 with the freezing station and its six refrigeration plants offering a capacity of 3,600 kW. Soon after this installation was completed, the icing was put into opera- tion. Herrenknecht AG was commissioned to build the two SBRs within one year. In September 2018, the SBRs, which were completely preassembled in the fac- tory and subjected to a functional test, reached their destination partially assem- bled. Within three months, the units were installed in the 50-m-deep shafts in co- operation with Herrenknecht. One of the first tasks taken on by Deil- mann-Haniel included the construction of the ABK (office building and shower facil- ities), storage hall, winch halls, material warehouse and workshop, as well as the assembly of the winches, hoisting ma- chines and all other equipment necessary for the construction. After delivery of the freezing plant foundation by the client, the freezing plant and its piping were also installed and put into operation between November 2017 and February 2018. The foreshafts were constructed by April 2018, and the sinking equipment for the main shafts (winding towers, winches, rope installation, etc.) was wrapped up by September 2018. The next big milestone is shaft sinking, including the expansion of the freeze shaft sections of the shafts. Challenges During the Project In contrast with other projects, the majority of the planning was carried out by the min- ing company. Unexpected changes to the plan within a short period of time made it challenging to adapt, paired with the fact that planning and execution of the work usually took place simultaneously. Working alongside Belarusian authorities was a new experience for the team, and took some time to adjust and develop a good work flow. Subcontractor relationships present- ed opportunities for innovative thinking during the construction of the aboveground facilities, and dedicated focus was neces- sary to meet completion deadlines. Deliveries presented their own chal- lenges with some materials shipping lat- The SBR grinds the shaft bottom in a star-shaped pattern. (Photo: The Redpath Group) This shaft-bottom angle shows the frozen shaft walls. (Photo: The Redpath Group)

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