NNA12S-05 had 45 opt or 1275 grams/ton of high grade silver. Compare that to 17S-01. I think the grade is higher - much higher.
https://nadina.com/images/2017-2--Nov-17S-01-Core-drillPhotos_-002.pdf
Now look at the high grade silver mines in the world:
https://www.mining.com/worlds-top-10-silver-mines/
What grades do they have? Take out Tahoe at 351 g/t because their mine in Guatamala is in trouble. The highest grade is 445 g/t.