Ann: CENTURY OPERATIONS AGAIN DELIVER RECORD METAL PRODUCTION, page-36

That's a fair point Redsceptre and I have actually been doing my own research on how similar company's (small cap zinc producers) report their cash costs.

See below, this is from Red River's last quarterly - BTW how good is the level of transparency:

My point was more C1 is the lowest possible hurdle....and as you can see from RVR's C1 costs above, the C3 costs is almost double that of the C1. C1 is not reflective of true cash flow which is hardly an issue for FMG/BHP (BIG issue for NCZ) which is possibly why they use it.

If we apply the RVR C1 to C3 multiplier to the NCZ announced September C1 of US$1.00/lb... does this mean its possible the NCZ's C3 is somewhere close to US$2.00/lb?