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[echarter]

There is something wrong with the figures you have regarding the Premier. It is known to average 35 Carats per hundered Tonnes for 100 years. The South African Mines have averaged 23 carats for the past 50 years at least.

If the figures you have are accurate for mines today, then fine, but they are anomalously high. You should subtract the Argyle from the figures as it probably skews the result.

And it's not a kimberlite.

EC<:-}