Accurate adjustment of blast movement recovered €211,0001 additional value in one blast
Mine operations were able to accurately adjust loading maps to account for blast movement and minimise ore loss.
An example blast demonstrates the ore loss and dilution that would have occurred if blast movement was not accounted for. Significant movement occurs within all blasts. Variation of ±50% from the mean horizontal movement is common, and occurred in this blast:
- Measured horizontal movement ranged from 11.2 – 41.7 m
As a result of accurately accounting for blast movement, this mine:
- Maximised ore yield—6,9002 tonnes of ore, valued at €211,285, were recovered
- Avoided dilution—11,3002 tonnes of waste were diverted from the mill, saving €136,000 in unnecessary milling costs
1. Numbers are rounded.
2. Calculated by BMM Explorer.
This blast map shows pre- and post-blast ore polygons, and areas of ore loss (pink) and dilution (brown). In this blast, accounting for blast movement added €211,285 of value.
Ore loss occurs when material containing grade (ore) is incorrectly sent to a waste dump.
- When a cost is given for ore loss, it is the sale value of the metal (copper) recovered from this ore (i.e. ore tonnes x grade x recovery rate x metal price)
Dilution occurs when waste is unintentionally mined with material containing ore and sent to the mill.
- When a cost is given for dilution, it is the cost of processing the waste material through the mill