See how it pans out

 

This phrase originated from gold mining.  Miners still separate the coveted gold dust and nuggets from the sand in which they are found with a pan of water.  When the pan is shaken, the heavier gold dust collects at its bottom.  The lighter sand sifts through and floats  off.  

From this practice the world has learned to discriminate in the same way the gold miner does-by "seeing how it pans out."