For Paddy - Revisiting Volumes16 May 2020 01:24
Hi Paddy, hope you are well. You may recall we had differing views on the volume of high grade rock at Havieron. You in your Twitter postings said 82.3m tonnes. I on the other hand had 21.9m tonnes [7.83m m3 x 2.8 specific gravity]. We had a discussion on here about the size of the high grade zone, you conceded some of my points but still thought amongst other matters that the length I used should have been doubled.
Take a look back now at the Hannam report that came out this week. If you use the figures they provide, you will see that they estimate something in the region of 20.4-21.6m tonnes of high grade rock - a number that I find reassuringly familiar and exceedingly close to my own.
If there is only 20-21m tonnes of high grade rock, then all the other maths on your tweet was wildly out. Figures you gave such as 18.8m tonnes of gold equivalent for 6g/t + 0.8% copper, based solely on the high grade zone identified to date just do not appear to be anywhere close to being accurate.
The purpose of this post is two-fold. First, and this sentence is not directed at you paddy in any way - you have been a gentleman throughout even if we have disagreed, but there are many on here who have been abusive towards those who do not blindly follow the more extreme calculations. Rational discussion should never be drowned out (though do not think that I have any faith in a change). Second, it is time that realism took place on this board and that realistic numbers are used.
Calculations as follows. On the released drill results, they say 4.4m oz of high grade material, grading 6.7 grams per tonne gold [copper referred to separately]. 4.4m oz * 31.1034768 = 136,855,297.9 grams of gold. 136,855,297.9 grams divided by 6.7g/t gives 20,426,164 tonnes of rock. You can reach the same approximate figure from the copper figures they give. 130,000 tonnes of 0.6% copper gives 21,666,667 tonnes of rock [130,000/0.006]. The difference being the rounding but somewhere between 20.4m and 21.6m tonnes of rock appears to be their estimate.