Over the life of mine (LOM) of Adumbi, a total of 49.77 Mt grading 2.17 g/t Au is expected to be mined from the open pit and delivered to the processing plant.
The scheduling process consists of developing a mine plan that is economically optimal using the inventory included in the practical pit designs and pit shell. The production schedule was based on a methodology of block selections from the block model inside the designed pits.
The mining production schedule sequence is planned to mine the Cut 1 and Cut 2 pit designs from the beginning of Year 1 to get rapid access to the ore and manage the strip ratio. Mining of the Cut 3 pit shell starts from the beginning of Year 2. The Adumbi deposit is planned to be to provide a throughput of 5.0 Mt/a of ore to the processing plant. Adumbi has an average stripping ratio of 11:1.
A conventional open-pit shovel-and-truck method will be used for the mining of sufficient ore to supply a 5.0 Mt/a of oxide, transition and fresh ore throughput. The mining functions of the operation will be carried out by a mining contractor.
The practical pit design incorporates the ramps together with the appropriate inter-ramp slope angles.
The open-pit design criteria were as follows:
• A nominal bench height of 8 m;
• The inclusion of the ramping systems, resulting in the recommended overall slope angles of approximately 40° to 45° being achieved;
• Haul road widths of 25 m, includi ........
