At $30/oz silver the ore would be roughly worth $70 / ton. Would expect 10% mining dilution so $63/ton. Would be lucky to get more than 80% recovery, so $51/ton. So you can see there is a lot of metallurgy and mining studies to be put out there to show such a moderate grade silver deposit can work. Wonawinta deposit was at similar grades and sent CCR and BOK broke. IMHO they need A$35/oz to make the open pit silver work. It can be engineered into life by better processing or recover some of the by products such as Au, Ba.
Kempfield is a big VHMS system that should have high Pb-Zn-Au-Ag sections and or Cu-Au sections.
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