In 2016, NGM proceeded with the construction of a DRA DMS plant that went into production in January 2017.
The plant’s process consists mainly of ore handling, size reduction, screening, washing and gravity concentration (separation or cycloning in dense media). The ore is broken down into three (3) size classes: -1 mm (reject), + 1-6 mm (fine) and + 6-40 mm (lumps). The ore is composed of several minerals (pisolite, laterite, platelet, goethite) and has an average grade of 25% Mn on all deposits. Therefore, the ore mixture is an important factor in ensuring the performance of the facility and the concentration at 42% manganese.
This new facility will be designed taking into account the existing Phase 1 parameters using the same production schemes, with the objective of achieving a production of 1.4 million tonnes per year.
Depending on the area available on the Biniomi site, the location of the Phase 1 plant and the proposed mining plan, the Phase 2 plant will be installed as shown in the figures opposite. Below is the diagram of the factory Phase 2:
Tailling Dump Facilities (TDF)
A tailings facility has been established in an area adjacent to the mill. It is a retention basin that not only allows the removal of residues by decantation, but also the water supply of the production process.
The long-term plan for tailings storage, particularly when production will increase, will be to use the mining areas of the upland adjacent to the mills once the manganese has been extracted. A series of retention basins, with a lifespan of 4 to 5 years, will be developed successively with embankment levels of up to 10 meters, and this must be done as part of the rehabilitation plan for the production areas. An example is provided by the diagram below: