Modern Mining April 2015

feature COUNTRY FOCUS – ZAMBIA Centre: View of 3 960 station vent cross cut.

Synclinorium Shaft project

The dip in the copper price plus disputes over the level of royalties have left Zambia’s copper mining industry reeling. Nevertheless, some Copperbelt players are pressing ahead with major capital projects designed to either expand production or extend mine life (or both), among them Mopani Copper Mines plc (MCM), owner of the venerable Nkana and Mufulira underground copper mines. At Nkana, one of the projects underway is the new Synclinorium Shaft, which is due to start commissioning by the end of this year. Playing a key role on delivering the new shaft is Murray & Roberts Cementation Zambia, which has completed the shaft sinking and is now busy with the equipping.

M ajority owned by global gi- ant Glencore, which is the world’s third biggest cop- per producer, MCM was last year named as Zambia’s Mining Company of the Year for 2013, in part because of its impressive investment in Zam- bia’s copper mining industry. Commenting on the award at the time, MCM’s CEO, Danny Cal- low, said: “We are aware that in order for us to continue operating in a more efficient and cost- effective manner, it is imperative that we invest in new technology and infrastructure. We an- ticipate a 30 per cent decline in ore production by 2018, therefore, we have invested almost US$900 million in sinking three new shafts; this includes the Synclinorium Shaft at Nkana, the Mindola and the Mufulira Deeps to extend

mine life by over 25 years and increase annual copper production at a reduced unit cost.” The Synclinorium project, which will access 115 Mt of ore at a grade of 1,9 % copper and 0,09 % cobalt, accounts for US$323 million of the US$900 million referred to by Callow and involves construction of both a main shaft and a ventilation shaft. Murray & Roberts Cementation is responsible for the main shaft (including a bulk air cooler level, two electrical cubbies and two stations). The shaft is 7 m in diameter and has been blind sunk to a depth of 1 280 m. Equipment used has included a stage and kibble winder, a five-boom jumbo shaft rig, a five-deck working stage with a cactus grab, two mini-excavators and an automated batch plant. A separate shaft-sinking contrac- tor, Redpath, is undertaking the vent shaft (using a raise borer) although Murray & Roberts Cementation handled the initial 50 m section of presinking. Also included in Murray & Roberts Cementation’s scope of work is the erection of the permanent 64 m high steel headgear which has been fabricated by Steel Services in South Africa and which was already largely on site and awaiting assembly when Modern Mining

Additional support being installed at bull nose before wetcrete application. Below: Photo taken in March this year showing the completed shaft ‘barrel’ with all cables installed (photo: Arthur Tassell).

38  MODERN MINING  April 2015