I queried the NRF Share List database and generated the linked file below. (Sorry, no location information.... you gotta contribute to get that.
)
http://www.sdsb.org/Documents/AverageSizeByDepth.csv
What it shows is something we probably could have guessed without the data... on average, the deeper you go the bigger the finds. (Unfortunately without miss rates it doesn't tell us if you get fewer larger finds too.)
Anyway, the discussion topic I have is this:
Do you vary your finders depending on what you're after and where you are or do you just use the finders with the highest Average Depth based on your skills?
Sort of like hunting... I use a small gun for small MOBs and a bigger gun for bigger MOBs. Do you think it works the same for mining?