You are looking at it from an engineering/process angle. Back up a little and think about one thing - why hasn't SRCH ever released any reports documenting the sampling of the slag, and the verification there really is gold there? I see that as proof that there is negligible gold in the slag. From what I know about the geology and the production figures over the years, there is no justification for believing there is much, if any, gold in the slag.
No need to look any further.
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