I just had a re-read of "SVL's" announcement concerning the metallurgical testing. No pretreatment and weak Na-CN leaching for 24 hours. This lead to 20-36% recovery of silver!
According to Professor Monhemius from the Dep. of Mineral Resources Eng., Royal School of Mines, Imperial College and according to Professor Neiva Correia from Dep. Eng. Quimica, Instituto Superior Tecnico:
"Attempts have been made to dissolve tetrahedrite in cyanide solutions but the recovery of silver was extremely low" - 1993.
Charles!!! Finish your PhD!!! And get one of the big boys on the job :)
"The problem is SVL has said it will cost x/ounce with potential upside, that is all we have to go on until they say otherwise." - Toll
Codswallop! we have Professors in the field of Metallurgy whose knowledge and decades of experiments to go on as well.
By the time SVL is in production, we will be recovering silver at ~90% with cash costs of ~$12/oz.
what a joke, page-15
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