title: Pregnant leach solution
text: # Pregnant leach solution
  
  Pregnant leach solution or pregnant liquor solution (PLS) is acidic metal-laden water generated from stockpile leaching and heap leaching. Pregnant leach solution is used in the solvent extraction and electrowinning (SX/EW) process.
  
  The portion of an original liquid that remains after other components have been dissolved by a solvent is called raffinate.
  
  