Modern Mining June 2016

WEST AFRICA

two 120-t class backhoes working in conjunc- tion with Cat 777 trucks. The shovels will work on 10 m high waste mining benches while the backhoes will be used to mine selec- tively and in difficult areas. It is envisaged that the start-up truck fleet will number 16 units but this will increase to a peak of 34 as haul distances increase. The processing plant facility and supporting infrastructure is being built to a design through- put of 4,0 Mt/a with a 25 % design factor which allows for an increase in future throughput with minimal additional capital. Run-of-mine ore from the open-pit opera- tions and stockpiles will be delivered to the gyratory primary crusher. The crushed ore will be transferred by conveyors to a reclaim stockpile with a 10 000-tonne live capacity. Reclaimed ore is conveyed to the SAG ball crushing (SABC) comminution circuit consist- ing of a primary SAG mill, a secondary ball mill, and a pebble crusher resulting in a P80 grind size of 75 µm. The grinding circuit product will be thick- ened and treated in the leach and CIP circuit for extraction and recovery of gold. The tailings from the CIP circuit will be treated by cyanide destruction and thickened prior to being dis- charged in the tailings storage facility (TSF). Gold is recovered from the loaded carbon in an elution and electrowinning circuit and will be poured into doré bars on site. Life of mine aver- age recovery is projected to be 92,8 %. The TSF is a fully high-density polyethyl- ene lined facility 1 km north of the process plant. The first stage has capacity for 16 to 18 months of production. Annual downstream raises constructed primarily with mine waste are designed to contain 62 Mt of tailings. Finally, it should be mentioned that while Fekola will be B2Gold’s first West African mine, it could ultimately be followed by a sec- ond of even bigger scale (in terms of tonnages though not gold production). The company

owns the Kiaka project in Mali’s neighbour, Burkina Faso, which it describes as one of the largest – though relatively low grade – unde- veloped gold resources in the region. B2Gold completed a Pre-Feasibility Study (PFS) which estimated that the resource could support a 6 Mt/a mine producing 186 000 ounces of gold a year for 13,6 years. B2Gold – which has com- mitted US$2,6 million to further exploration of the property during 2016 – says it is currently reviewing economically feasible options for development in the current gold price envi- ronment. Higher throughput scenarios will be considered to take full advantage of the project’s 4,86 million ounce measured and indicated mineral resource. Report compiled by Arthur Tassell, photos courtesy of B2Gold

The concrete team pours the next section of the conveyor columns.

Payback period for Fekola just 28 months In June last year B2Gold announced the “robust results” of an Optimised Feasibility Study (OFS) for Fekola, indicating that the project would cost an estimated US$395 million to build (excluding US$38 million for early works) with a further US$67 million being required for the mining fleet and for on- site power generation (to be provided by a 47 MW HFO generator plant). According to the OFS (and based on a reserve gold price of US$1 300 per ounce), the project has a positive pre-tax NPV of US$1,01 billion at a discount rate of 5 % and a pre-tax IRR of 35 %. Payback is approximately 28 months after the first gold production. 

Employees enjoy the new high-end kitchen facilities. Phase 2 of the camp is due to be complete in July 2016.

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June 2016  MODERN MINING  27