$30,000 per tonneNow thats much closer to my calculation which were 10,000 carats per tonne times 6.5% recovery faceted times $100 per carat equals $65,000 per tonne. TGX actual estimates included a lower figure for all stones and included saphires and also included lower valued cabochons. So I am reasonably satisfied with the $30,000 number.
Also note that if TGX produces jewelry there will be an added mark up which I estimated based on the necklaces at $45,000 to be around $600,000 a tonne retail finished jewelry. This of course does not include any costs for the gold or for manufacturing. The point here being that there is further opportunity to provide value added above the $30,000 per tonne but not likely near as high as the $600,000 per tonne but at least in the right order of magnitude.