Would only have to worry about the depth if it was open pit.
Don't think they would consider open pit with that depth and probably wouldn't make sense based on the grades and widths anyway.
Thought I saw somewhere that anything over 15g/t in Oz is commercial for underground mining - depending on resource size of course.
Imagine would just go undergound and chase the veins along strike/down dip.
Could easy go down to 1500/2000M (depending on other factors)
These kind of veins are pretty damn valuable - 2000g/t silver is worth about US$1800 per tonne of ore WITHOUT any gold.
The small tonnages mean small capex and so you can spend a fair bit more on the underground capex/opex.
tenement map and lineaments santa cruz, page-14
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