Cobalt extractions in all autoclave oxidative leaches were typically greater than 95% at autoclave temperatures of 115, 135 and 155°C, and 800 kPa oxygen pressure. These consistent leach results indicate that high extractions could be achieved at an autoclave temperature lower than 115°C (to be demonstrated with further testing).
I am not aware of another operating sulphide Cu/Co sulphide operation that is using autoclaves. Autoclaves are typically used for HPAL Latterite deposits (CLA is indicating at lower temperatures and pressures than laterites granted). Sulphide deposits typically do not need autoclaves and hence why generally they have lower CAPEX/OPEX requirements than laterite deposits. If autoclaves will be required then the costs will signficantly increase vs other sulphide deposits.
Regarding the pricing, I won't comment too much on this except for the fact that the market did not seem pleased using current Co/Ni prices in a recently released PFS.
CLA
Price at posting:
14.0¢ Sentiment: None Disclosure: Not Held
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