amalgamation vs smelting

amalgamation

noun
  • The production of an alloy of mercury and another metal. 

  • The result of amalgamating; a mixture or alloy. 

  • The process of amalgamating; a mixture, merger or consolidation. 

smelting

noun
  • The process of melting or fusion, especially to extract a metal from its ore. 

How often have the words amalgamation and smelting occurred in a corpus of books? (source: Google Ngram Viewer )