Massive turnaround imminent?, page-83

The mineralisation at the surface is thin yes, as first cobalt has alluded to recently with it's 'underground only' resource it is expected that depth is needed. European Cobalt is also going underground. This is 105 years ago, in 1913:

Given 105 year old machinery was able to pull out 21kt in a single year, I can't say I share your concern for ore vein thickness.

Right now it's all about finding intercept grades like the muck pile sampling produced imo. 

Even at today's low $20/oz silver price, that's a lot of $$$ worth for a single year.

Mineralisation in the area is peculiar in the sense that sometimes higher grade cobalt is associated with lower grade silver, but we'll soon see just how much the silver credits can add to the economics.