RE: Kevin’s latest you tube video15 Nov 2019 15:53
Ok Ash, here goes, until May 2018 the company included the stockpile tonnage and grade, which at that point stood at 62,200 tonnes of ore at a weighted grade of 3.85g/t Au.
In August 2018, there was no figure for the stockpile, however ore production was 70,425 tonnes and the quantity milled was 49,325 Tonnes, which means 21,200 tonnes of ore went to stockpile, making the stockpile 83,400 tonnes. With regards to grade, you can only assume that what was diverted to stockpile was the same as the head grade milled - in this quarter it was 4.99%, which means the stockpile was then 83,400 tonnes @ 4.14g/t containing 345258 grams of gold.
In November 2018 there was 83,229 tonnes of ore mined with 49,272 Tonnes milled at a grade of 4.94g/t. This increased the stockpile by 33,957 Tonnes, leaving it at 117,357 Tonnes@4.37g/t containing 513005 grams of gold.
In February 2019 quarter this year, production was 59,556 Tonnes, with 49,717 tonnes milled @ 5.23g/t. So the stockpile increased to 127,196 Tonnes @ 4.44g/t for 564463 grams of gold.
In May ore production reduced to 24,686 Tonnes with 46,825 tonnes milled at a grade of 4.83g/t, reducing the stockpile by 22,139 Tonnes to 105,057 Tonnes. I'm assuming the ore is coming off the stockpile is effectively coming off the top, so at this point the stockpile grade would be about 4.3g/t.
Finally the August figures were 43,367 Tonnes mined, 48,312 Tonnes Processed @ 4.18g/t reducing the stockpile by 4,945 Tonnes to 100,112 tonnes at about 4.25g/t (425,476 grams of gold) or just over $20 million.
There are a few assumptions there, the biggest one being how the ore is stacked, some mines have a radial stacker with conveyer off the bottom (effectively a first in first out system) some just remove with a front end loader giving a first in last out system. I'm assuming the latter.