In my informed opinion, that information is being withheld deliberately.
If that sample was found 50 meters from the surface, they would be shouting it from the rooftops.
https://canadasilvercobaltworks.com/wp-content/uploads/2016/11/CCW-NR-Jan.-2221-additional-HG-Ag-final.pdf
From this, it’s about 400m down, little over 1300 feet.