RE: 5p by Xmas29 Jun 2022 09:09
Hi Gregg, yes only plant 1 is high grade.
So if you reverse engineer the calc for the 24000oz numbers and assume a 80% recovery factor and a grade of only 2.4g/t:
Plant 1 gold = 10,500oz x 31.1 / (0.8 x 2.4g/t) = 170,078t of ore
Plants 2-4 will process ( 924,000-170,078 = ) 753,922t
Assuming 50% recovery, to get the remaining (24000-10500=) 13,500oz then the grade is only 1.1g/t which feels very low to me.
753,929t x 0.5 x 1.11g/t / 31.1 = 13,545oz
To achieve the same 24,000oz- if the grade of gold at plant 1 increases the gold from plant 2-4 must decreases (the grade drops lower than 1.11)
I feel the numbers are conservative. The average grade of the gold in the HL and tailings is only 1.11g/t. It gives credence to the cut-off grade dropping below 0.8g/t which does help push the total gold resource even higher which is obviously good.
One other thing. If plant 1 processes 170,078tonnes that is 477tonnes per day, ok so close to the 500tpd we know it can handle.
Plants 2-4 are processing 753922 tonnes, plant 3 is a 20kt HL plant and can process 240,000t per annum. Plant 4 is either 100,000 or 120,000t (my notes are confusing me), assuming 100,000t this is 1.2mill tonnes per annum. So plants 3 and 4 can process 1.44mill tonnes and are to take 753,922t. That’s not considering plant 2.
There is plenty of scope to increase the gold being processed if they can mine a large enough tonnage.
In summary slide 11 seems very conservative but perhaps points to the cut-off grade dropping below 0.8 g/t and that will help increase the gold in the MRE…