In the solvent extraction a mixture of an extractant in a diluent is used to extract a metal from one phase to another.  In solvent extraction this mixture is often referred to as the "organic" because the main constituent (diluent) is some type of oil.
The PLS (pregnant leach solution) is mixed to emulsification with the stripped organic and allowed to separate.  The metal will be exchanged from the PLS to the organic they are modified.  The resulting streams will be a loaded organic and a raffinate.  When dealing with electrowinning, the loaded organic is then mixed to emulsification with a lean electrolyte and allowed to separate.  The metal will be exchanged from the organic to the electrolyte.  The resulting streams will be a stripped organic and a rich electrolyte.  The organic stream is recycled through the solvent extraction process while the aqueous streams cycle through leaching and electrowinning processes respectively.