Ann: Nova Confirms Exceptional Ore Sorting Viability at Korbel, page-10

Results in ballpark of my research over a year ago

https://hotcopper.com.au/posts/42563371/single


Interesting below is the increase of head-grade by a multiple of 11.9 times.


From linked paper: https://sci-hub.tw/10.1080/25726641.2019.1631077

The West African sample is from a decommissioned heap leach where the site is actively investigating options for retreating the material which has an esti- mated head grade of ∼0.3 g/t (Mcgrath, Mcgrath, Eks- teen et al. 2018).

For the ex-heap material separation at an SG of 2.75 and discarding the −300 μm fraction results in 62% of the gold recovered into 5% of the feed mass, increasing the head grade from 0.11 to 1.31 g/t(scenario a). To recover more gold (and mass), a split at and SG of 2.65 with rejection of the −300 μm fraction yielded 97% of the gold in 37% of the feed mass, increasing the head grade to 0.29 g/t (scenario b).

https://sci-hub.tw/10.1080/25726641.2019.1631077

In principle it may also indicate that Nova could drop the cut-off grade from 0.18 g/t down to 0.11 g/t.