Re #1 - Yep the material starts at surface, although sometimes there is 1m of no-grade assay's. The JORC volume estimate may be light because a massive number of the intercepts end in mineralisation, for example within the diagonal string KH1_672 to KH1_684 (all drilled to 2m) then KH1_426 to KH1_416 (all drilled to 4m), the bottom of every intercept was the end of the drillhole. The drilling appeared to be confirming there was 2m then 4m of mineralisation and the grade of this material (which it did). The drilling wasn't attempting to understand if that mineralisation might actually be deeper and if so, how much deeper. Despite the massive number of laterite drill holes (but not much in total length), more drilling is likely to be needed to understand how deep the mineralisation goes. I don't know if TG6 will simply take the top few metres and drill from that new, lower platform or redrill to perhaps 5-6m. I suspect they will be cautious and re-drill.
Re Tasman and Diemen piles - yep a waiting game for grades (and met test on the optimal way of processing).
Because the way material is crushed in a lab situation is likely to be different to field crushing, I wouldn't put much weight on the lab crush size distribution matching the field crush distribution. Volume estimates for Diemen's leach test are available. The "Estimated Recovered" in this instance is recovered from the Diemen's pit and put on the leach pad, not the volume of gold recovered from the sample. The Diemen leach pad therefore is estimated to contain about 31,584t (17,698 + 13,886). This estimate won't be JORC 2012 compliant so its likely TG6 can't reference it via ASX rules.
Until we get assay results, the most likely indicator of Diemen heap leach ore's is that no production heap leach has occurred. If the heap leach recovery was high (with a low residual grade), its likely one of the previous owners would have tried a larger production heap leach and there would be publicity about the recovery. There's no production heap leach and no publicity about the trial recovery rate indicating its low (with a lot of gold left in the piles).
TG6 Price at posting:
11.5¢ Sentiment: Buy Disclosure: Held
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