Ann: Strong Mineralisation in Manto & Callancocha Structure, page-64

The voice of reason, thank you for that. Using those manto dimensions (1200 x 800 x 10) gives 9.6m m³
Multiplied by an SG of 2 = 19.2 million tons x $113.43 = $2.178 Billion. I had based the 2 km manto length on an old (2016) estimate and I am assuming a width of 800 m based on the statement that Humaspunco is 800 m wide and the manto is observed "along the perimeter" which I assume means it appears all around the circumference of the hill. Point taken about adjusting the 15m down hole "width" for true width and no that can't be the 800m - to avoid confusing myself in my head I call it "thickness" not width. And again you have to stress you can't extrapolate all this from just one hole. Still it is enticing considering this is just one manto and doesn't include the veins, disseminated zones or Callancocha. Happy dreams everyone.