RE:RE:RE:My AISC calculationI've found that 'total revenue per tonne' and 'total cost per tonne' is the only sane way. Then any trend-charting of costs is unaffected by changes in secondary metal prices. You can decide for yourself what items are included in total cost, but never include byproduct credits (these belong in revenue). You also can have different cost levels, similar to C1/C2/C3, but defined to suit what exactly you wish to track.
Note that for some breakdowns you have to use zinc-equivalence for grade, but that's not a lot more work.
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AlfTanner wrote: Galvanizer, thank you for your comments. I find it strange that "Depreciation, depletion and amortization" is listed under "MINE OPERATING EXPENSES", but it is not included in AISC. I appreciate you referencing page 23 of the MD&A. That at least explains where AISC comes from.
Personally, I just do not see much value in the AISC number. At least it is a lot more valid than "cash cost", which I consider to be totally useless.