This gives me confidence AISC will be close to $1000...50-75% gravity recovery is huge for the fresh ore. just means lower costs and better recovery, win-win. Grind size is also high, just means less energy and lower AISC as well.
Cyanide is one of the highest reagent costs in the process plant, so the reduction in leaching time from 33 to 24 hours is good news also.
Below is the prior gravity assumptions (scoping).
The leach rates improved considerably in the Pre-Feasibility Study testwork with the addition of gravity recovery to the flowsheet, with the gravity gold component being measured at between 34-53% for the Fresh mineralisation and 19-62% for the oxide mineralisation. Physical testwork indicates bond work indices of 13kWh/t to 20KWh/t and low to moderate abrasion indices
Ann: Quarterly Activities and Cashflow Report, page-3
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