Why?
It's probably bloody hard work and unless you have a hand held portable XRF you can nothing but guess the % chalcopyrite from phyrotite. Even then they're spot readings.
We're getting there but the old way the classical way. The good news is that the mineralisation is showihg up on the gravity surveys. Which supposes more useful brownfield exploration to come.
Why? It's probably bloody hard work and unless you have a hand...
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