TNC 0.00% 3.0¢ true north copper limited

the 25% is my estimate of the economically recoverable copper...

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    the 25% is my estimate of the economically recoverable copper remaining, given most of the material has been preleached (coming of old dump leaches), was probably not agglomerated with acid pretreatment and I don't believe the quoted assay number tells a truthful story. Total copper assay is not a measure of how much is leachable. It is also meaningless just to quote total leachable copper, as every day a heap runs costs money (as well as all the downstream processing costs), recovery is not linear, so daily recovery tapers off to loss making levels. A better way to report predicted recovery is the recovery at the point where it becomes revenue neutral (averaged processing cost = value of extracted copper), as every bit of recovery after that point is actually reducing company profitability. This is TNC's problem, as I suspect they have varied the mode of processing without adjusting leach rates and total economic recovery cut-offs in the models feeding into reserve models. They are also basing processing cost estimates on outdated numbers for different ores, hence much of the quoted resources will be uneconomic to mine and process. Thus they may report recovery and production but it may be loss making. The issue here is that the company board probably has no expertise in relevant mineral processing and has failed to seek independent advise, thus probably believe what they publish. Very much like the board and senior management at TBA, and we all know how that turned out.
 
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