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In a nutshell:

Geology will be either primary or secondary.  That is, either broken down in situ over time, or washed away to another site.

Buyer demand is based principally on brightness, level of impurities and particle size.

In situ deposits usually meet first two criteria, and secondary deposits provide finer particles, for obvious reasons.


From a mining perspective obviously the shallower the better (strip ratio factor), and the more the merrier.

The Wickepin deposit is a cracker!


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