Figure 1 shows the stacked total mining profile of waste and process feed. Overall strip ratio is 2:1, however 67% of the waste is alluvium gravel which has the advantage of lower mining costs. The equivalent strip ratio based on hard rock costs is approximately 1.57:1.
Figure 2 shows the LoM stacked annual copper production by conventional oxide leaching compared to sulfide leaching. Sulfide leaching makes up only 14% of the total LoM copper production and does commence until year 8 of operations.
